968 lines
41 KiB
C++
968 lines
41 KiB
C++
// © 2016 and later: Unicode, Inc. and others.
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// License & terms of use: http://www.unicode.org/copyright.html
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/*************************************************************************
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* Copyright (c) 1997-2016, International Business Machines Corporation
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* and others. All Rights Reserved.
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**************************************************************************
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*
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* File TIMEZONE.H
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*
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* Modification History:
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*
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* Date Name Description
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* 04/21/97 aliu Overhauled header.
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* 07/09/97 helena Changed createInstance to createDefault.
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* 08/06/97 aliu Removed dependency on internal header for Hashtable.
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* 08/10/98 stephen Changed getDisplayName() API conventions to match
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* 08/19/98 stephen Changed createTimeZone() to never return 0
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* 09/02/98 stephen Sync to JDK 1.2 8/31
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* - Added getOffset(... monthlen ...)
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* - Added hasSameRules()
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* 09/15/98 stephen Added getStaticClassID
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* 12/03/99 aliu Moved data out of static table into icudata.dll.
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* Hashtable replaced by new static data structures.
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* 12/14/99 aliu Made GMT public.
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* 08/15/01 grhoten Made GMT private and added the getGMT() function
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**************************************************************************
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*/
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#ifndef TIMEZONE_H
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#define TIMEZONE_H
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#include "unicode/utypes.h"
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/**
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* \file
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* \brief C++ API: TimeZone object
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*/
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#if !UCONFIG_NO_FORMATTING
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#include "unicode/uobject.h"
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#include "unicode/unistr.h"
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#include "unicode/ures.h"
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#include "unicode/ucal.h"
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U_NAMESPACE_BEGIN
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class StringEnumeration;
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/**
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*
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* <code>TimeZone</code> represents a time zone offset, and also figures out daylight
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* savings.
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*
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* <p>
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* Typically, you get a <code>TimeZone</code> using <code>createDefault</code>
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* which creates a <code>TimeZone</code> based on the time zone where the program
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* is running. For example, for a program running in Japan, <code>createDefault</code>
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* creates a <code>TimeZone</code> object based on Japanese Standard Time.
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*
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* <p>
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* You can also get a <code>TimeZone</code> using <code>createTimeZone</code> along
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* with a time zone ID. For instance, the time zone ID for the US Pacific
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* Time zone is "America/Los_Angeles". So, you can get a Pacific Time <code>TimeZone</code> object
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* with:
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* \htmlonly<blockquote>\endhtmlonly
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* <pre>
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* TimeZone *tz = TimeZone::createTimeZone("America/Los_Angeles");
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* </pre>
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* \htmlonly</blockquote>\endhtmlonly
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* You can use the <code>createEnumeration</code> method to iterate through
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* all the supported time zone IDs, or the <code>getCanonicalID</code> method to check
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* if a time zone ID is supported or not. You can then choose a
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* supported ID to get a <code>TimeZone</code>.
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* If the time zone you want is not represented by one of the
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* supported IDs, then you can create a custom time zone ID with
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* the following syntax:
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*
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* \htmlonly<blockquote>\endhtmlonly
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* <pre>
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* GMT[+|-]hh[[:]mm]
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* </pre>
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* \htmlonly</blockquote>\endhtmlonly
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*
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* For example, you might specify GMT+14:00 as a custom
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* time zone ID. The <code>TimeZone</code> that is returned
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* when you specify a custom time zone ID uses the specified
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* offset from GMT(=UTC) and does not observe daylight saving
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* time. For example, you might specify GMT+14:00 as a custom
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* time zone ID to create a TimeZone representing 14 hours ahead
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* of GMT (with no daylight saving time). In addition,
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* <code>getCanonicalID</code> can also be used to
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* normalize a custom time zone ID.
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*
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* TimeZone is an abstract class representing a time zone. A TimeZone is needed for
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* Calendar to produce local time for a particular time zone. A TimeZone comprises
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* three basic pieces of information:
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* <ul>
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* <li>A time zone offset; that, is the number of milliseconds to add or subtract
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* from a time expressed in terms of GMT to convert it to the same time in that
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* time zone (without taking daylight savings time into account).</li>
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* <li>Logic necessary to take daylight savings time into account if daylight savings
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* time is observed in that time zone (e.g., the days and hours on which daylight
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* savings time begins and ends).</li>
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* <li>An ID. This is a text string that uniquely identifies the time zone.</li>
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* </ul>
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*
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* (Only the ID is actually implemented in TimeZone; subclasses of TimeZone may handle
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* daylight savings time and GMT offset in different ways. Currently we have the following
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* TimeZone subclasses: RuleBasedTimeZone, SimpleTimeZone, and VTimeZone.)
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* <P>
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* The TimeZone class contains a static list containing a TimeZone object for every
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* combination of GMT offset and daylight-savings time rules currently in use in the
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* world, each with a unique ID. Each ID consists of a region (usually a continent or
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* ocean) and a city in that region, separated by a slash, (for example, US Pacific
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* Time is "America/Los_Angeles.") Because older versions of this class used
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* three- or four-letter abbreviations instead, there is also a table that maps the older
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* abbreviations to the newer ones (for example, "PST" maps to "America/Los_Angeles").
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* Anywhere the API requires an ID, you can use either form.
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* <P>
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* To create a new TimeZone, you call the factory function TimeZone::createTimeZone()
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* and pass it a time zone ID. You can use the createEnumeration() function to
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* obtain a list of all the time zone IDs recognized by createTimeZone().
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* <P>
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* You can also use TimeZone::createDefault() to create a TimeZone. This function uses
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* platform-specific APIs to produce a TimeZone for the time zone corresponding to
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* the client's computer's physical location. For example, if you're in Japan (assuming
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* your machine is set up correctly), TimeZone::createDefault() will return a TimeZone
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* for Japanese Standard Time ("Asia/Tokyo").
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*/
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class U_I18N_API TimeZone : public UObject {
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public:
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/**
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* @stable ICU 2.0
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*/
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virtual ~TimeZone();
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/**
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* Returns the "unknown" time zone.
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* It behaves like the GMT/UTC time zone but has the
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* <code>UCAL_UNKNOWN_ZONE_ID</code> = "Etc/Unknown".
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* createTimeZone() returns a mutable clone of this time zone if the input ID is not recognized.
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*
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* @return the "unknown" time zone.
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* @see UCAL_UNKNOWN_ZONE_ID
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* @see createTimeZone
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* @see getGMT
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* @stable ICU 49
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*/
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static const TimeZone& U_EXPORT2 getUnknown();
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/**
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* The GMT (=UTC) time zone has a raw offset of zero and does not use daylight
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* savings time. This is a commonly used time zone.
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*
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* <p>Note: For backward compatibility reason, the ID used by the time
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* zone returned by this method is "GMT", although the ICU's canonical
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* ID for the GMT time zone is "Etc/GMT".
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*
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* @return the GMT/UTC time zone.
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* @see getUnknown
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* @stable ICU 2.0
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*/
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static const TimeZone* U_EXPORT2 getGMT(void);
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/**
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* Creates a <code>TimeZone</code> for the given ID.
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* @param ID the ID for a <code>TimeZone</code>, such as "America/Los_Angeles",
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* or a custom ID such as "GMT-8:00".
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* @return the specified <code>TimeZone</code>, or a mutable clone of getUnknown()
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* if the given ID cannot be understood or if the given ID is "Etc/Unknown".
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* The return result is guaranteed to be non-NULL.
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* If you require that the specific zone asked for be returned,
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* compare the result with getUnknown() or check the ID of the return result.
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* @stable ICU 2.0
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*/
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static TimeZone* U_EXPORT2 createTimeZone(const UnicodeString& ID);
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/**
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* Returns an enumeration over system time zone IDs with the given
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* filter conditions.
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* @param zoneType The system time zone type.
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* @param region The ISO 3166 two-letter country code or UN M.49
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* three-digit area code. When NULL, no filtering
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* done by region.
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* @param rawOffset An offset from GMT in milliseconds, ignoring
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* the effect of daylight savings time, if any.
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* When NULL, no filtering done by zone offset.
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* @param ec Output param to filled in with a success or
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* an error.
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* @return an enumeration object, owned by the caller.
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* @stable ICU 4.8
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*/
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static StringEnumeration* U_EXPORT2 createTimeZoneIDEnumeration(
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USystemTimeZoneType zoneType,
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const char* region,
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const int32_t* rawOffset,
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UErrorCode& ec);
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/**
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* Returns an enumeration over all recognized time zone IDs. (i.e.,
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* all strings that createTimeZone() accepts)
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*
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* @return an enumeration object, owned by the caller.
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* @stable ICU 2.4
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*/
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static StringEnumeration* U_EXPORT2 createEnumeration();
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/**
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* Returns an enumeration over time zone IDs with a given raw
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* offset from GMT. There may be several times zones with the
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* same GMT offset that differ in the way they handle daylight
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* savings time. For example, the state of Arizona doesn't
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* observe daylight savings time. If you ask for the time zone
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* IDs corresponding to GMT-7:00, you'll get back an enumeration
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* over two time zone IDs: "America/Denver," which corresponds to
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* Mountain Standard Time in the winter and Mountain Daylight Time
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* in the summer, and "America/Phoenix", which corresponds to
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* Mountain Standard Time year-round, even in the summer.
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*
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* @param rawOffset an offset from GMT in milliseconds, ignoring
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* the effect of daylight savings time, if any
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* @return an enumeration object, owned by the caller
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* @stable ICU 2.4
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*/
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static StringEnumeration* U_EXPORT2 createEnumeration(int32_t rawOffset);
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/**
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* Returns an enumeration over time zone IDs associated with the
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* given country. Some zones are affiliated with no country
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* (e.g., "UTC"); these may also be retrieved, as a group.
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*
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* @param country The ISO 3166 two-letter country code, or NULL to
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* retrieve zones not affiliated with any country.
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* @return an enumeration object, owned by the caller
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* @stable ICU 2.4
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*/
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static StringEnumeration* U_EXPORT2 createEnumeration(const char* country);
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/**
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* Returns the number of IDs in the equivalency group that
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* includes the given ID. An equivalency group contains zones
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* that have the same GMT offset and rules.
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*
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* <p>The returned count includes the given ID; it is always >= 1.
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* The given ID must be a system time zone. If it is not, returns
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* zero.
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* @param id a system time zone ID
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* @return the number of zones in the equivalency group containing
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* 'id', or zero if 'id' is not a valid system ID
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* @see #getEquivalentID
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* @stable ICU 2.0
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*/
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static int32_t U_EXPORT2 countEquivalentIDs(const UnicodeString& id);
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/**
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* Returns an ID in the equivalency group that
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* includes the given ID. An equivalency group contains zones
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* that have the same GMT offset and rules.
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*
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* <p>The given index must be in the range 0..n-1, where n is the
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* value returned by <code>countEquivalentIDs(id)</code>. For
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* some value of 'index', the returned value will be equal to the
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* given id. If the given id is not a valid system time zone, or
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* if 'index' is out of range, then returns an empty string.
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* @param id a system time zone ID
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* @param index a value from 0 to n-1, where n is the value
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* returned by <code>countEquivalentIDs(id)</code>
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* @return the ID of the index-th zone in the equivalency group
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* containing 'id', or an empty string if 'id' is not a valid
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* system ID or 'index' is out of range
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* @see #countEquivalentIDs
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* @stable ICU 2.0
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*/
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static const UnicodeString U_EXPORT2 getEquivalentID(const UnicodeString& id,
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int32_t index);
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/**
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* Creates an instance of TimeZone detected from the current host
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* system configuration. Note that ICU4C does not change the default
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* time zone unless TimeZone::adoptDefault(TimeZone*) or
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* TimeZone::setDefault(const TimeZone&) is explicitly called by a
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* user. This method does not update the current ICU's default,
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* and may return a different TimeZone from the one returned by
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* TimeZone::createDefault().
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*
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* <p>This function is not thread safe.</p>
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*
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* @return A new instance of TimeZone detected from the current host system
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* configuration.
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* @stable ICU 55
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*/
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static TimeZone* U_EXPORT2 detectHostTimeZone();
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/**
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* Creates a new copy of the default TimeZone for this host. Unless the default time
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* zone has already been set using adoptDefault() or setDefault(), the default is
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* determined by querying the system using methods in TPlatformUtilities. If the
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* system routines fail, or if they specify a TimeZone or TimeZone offset which is not
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* recognized, the TimeZone indicated by the ID kLastResortID is instantiated
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* and made the default.
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*
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* @return A default TimeZone. Clients are responsible for deleting the time zone
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* object returned.
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* @stable ICU 2.0
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*/
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static TimeZone* U_EXPORT2 createDefault(void);
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/**
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* Sets the default time zone (i.e., what's returned by createDefault()) to be the
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* specified time zone. If NULL is specified for the time zone, the default time
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* zone is set to the default host time zone. This call adopts the TimeZone object
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* passed in; the client is no longer responsible for deleting it.
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*
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* <p>This function is not thread safe. It is an error for multiple threads
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* to concurrently attempt to set the default time zone, or for any thread
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* to attempt to reference the default zone while another thread is setting it.
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*
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* @param zone A pointer to the new TimeZone object to use as the default.
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* @stable ICU 2.0
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*/
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static void U_EXPORT2 adoptDefault(TimeZone* zone);
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#ifndef U_HIDE_SYSTEM_API
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/**
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* Same as adoptDefault(), except that the TimeZone object passed in is NOT adopted;
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* the caller remains responsible for deleting it.
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*
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* <p>See the thread safety note under adoptDefault().
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*
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* @param zone The given timezone.
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* @system
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* @stable ICU 2.0
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*/
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static void U_EXPORT2 setDefault(const TimeZone& zone);
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#endif /* U_HIDE_SYSTEM_API */
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/**
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* Returns the timezone data version currently used by ICU.
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* @param status Output param to filled in with a success or an error.
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* @return the version string, such as "2007f"
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* @stable ICU 3.8
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*/
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static const char* U_EXPORT2 getTZDataVersion(UErrorCode& status);
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/**
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* Returns the canonical system timezone ID or the normalized
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* custom time zone ID for the given time zone ID.
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* @param id The input time zone ID to be canonicalized.
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* @param canonicalID Receives the canonical system time zone ID
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* or the custom time zone ID in normalized format.
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* @param status Receives the status. When the given time zone ID
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* is neither a known system time zone ID nor a
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* valid custom time zone ID, U_ILLEGAL_ARGUMENT_ERROR
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* is set.
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* @return A reference to the result.
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* @stable ICU 4.0
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*/
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static UnicodeString& U_EXPORT2 getCanonicalID(const UnicodeString& id,
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UnicodeString& canonicalID, UErrorCode& status);
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/**
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* Returns the canonical system time zone ID or the normalized
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* custom time zone ID for the given time zone ID.
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* @param id The input time zone ID to be canonicalized.
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* @param canonicalID Receives the canonical system time zone ID
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* or the custom time zone ID in normalized format.
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* @param isSystemID Receives if the given ID is a known system
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* time zone ID.
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* @param status Receives the status. When the given time zone ID
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* is neither a known system time zone ID nor a
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* valid custom time zone ID, U_ILLEGAL_ARGUMENT_ERROR
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* is set.
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* @return A reference to the result.
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* @stable ICU 4.0
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*/
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static UnicodeString& U_EXPORT2 getCanonicalID(const UnicodeString& id,
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UnicodeString& canonicalID, UBool& isSystemID, UErrorCode& status);
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/**
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* Converts a system time zone ID to an equivalent Windows time zone ID. For example,
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* Windows time zone ID "Pacific Standard Time" is returned for input "America/Los_Angeles".
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*
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* <p>There are system time zones that cannot be mapped to Windows zones. When the input
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* system time zone ID is unknown or unmappable to a Windows time zone, then the result will be
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* empty, but the operation itself remains successful (no error status set on return).
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*
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* <p>This implementation utilizes <a href="http://unicode.org/cldr/charts/supplemental/zone_tzid.html">
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* Zone-Tzid mapping data</a>. The mapping data is updated time to time. To get the latest changes,
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* please read the ICU user guide section <a href="http://userguide.icu-project.org/datetime/timezone#TOC-Updating-the-Time-Zone-Data">
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* Updating the Time Zone Data</a>.
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*
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* @param id A system time zone ID.
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* @param winid Receives a Windows time zone ID. When the input system time zone ID is unknown
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* or unmappable to a Windows time zone ID, then an empty string is set on return.
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* @param status Receives the status.
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* @return A reference to the result (<code>winid</code>).
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* @see getIDForWindowsID
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*
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* @stable ICU 52
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*/
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static UnicodeString& U_EXPORT2 getWindowsID(const UnicodeString& id,
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UnicodeString& winid, UErrorCode& status);
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/**
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* Converts a Windows time zone ID to an equivalent system time zone ID
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* for a region. For example, system time zone ID "America/Los_Angeles" is returned
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* for input Windows ID "Pacific Standard Time" and region "US" (or <code>null</code>),
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* "America/Vancouver" is returned for the same Windows ID "Pacific Standard Time" and
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* region "CA".
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*
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* <p>Not all Windows time zones can be mapped to system time zones. When the input
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* Windows time zone ID is unknown or unmappable to a system time zone, then the result
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* will be empty, but the operation itself remains successful (no error status set on return).
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*
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* <p>This implementation utilizes <a href="http://unicode.org/cldr/charts/supplemental/zone_tzid.html">
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* Zone-Tzid mapping data</a>. The mapping data is updated time to time. To get the latest changes,
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* please read the ICU user guide section <a href="http://userguide.icu-project.org/datetime/timezone#TOC-Updating-the-Time-Zone-Data">
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* Updating the Time Zone Data</a>.
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*
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* @param winid A Windows time zone ID.
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* @param region A null-terminated region code, or <code>NULL</code> if no regional preference.
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* @param id Receives a system time zone ID. When the input Windows time zone ID is unknown
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* or unmappable to a system time zone ID, then an empty string is set on return.
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* @param status Receives the status.
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* @return A reference to the result (<code>id</code>).
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* @see getWindowsID
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*
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* @stable ICU 52
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*/
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static UnicodeString& U_EXPORT2 getIDForWindowsID(const UnicodeString& winid, const char* region,
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UnicodeString& id, UErrorCode& status);
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/**
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* Returns true if the two TimeZones are equal. (The TimeZone version only compares
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* IDs, but subclasses are expected to also compare the fields they add.)
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*
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* @param that The TimeZone object to be compared with.
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* @return True if the given TimeZone is equal to this TimeZone; false
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* otherwise.
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* @stable ICU 2.0
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*/
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virtual UBool operator==(const TimeZone& that) const;
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/**
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|
* Returns true if the two TimeZones are NOT equal; that is, if operator==() returns
|
|
* false.
|
|
*
|
|
* @param that The TimeZone object to be compared with.
|
|
* @return True if the given TimeZone is not equal to this TimeZone; false
|
|
* otherwise.
|
|
* @stable ICU 2.0
|
|
*/
|
|
UBool operator!=(const TimeZone& that) const {return !operator==(that);}
|
|
|
|
/**
|
|
* Returns the TimeZone's adjusted GMT offset (i.e., the number of milliseconds to add
|
|
* to GMT to get local time in this time zone, taking daylight savings time into
|
|
* account) as of a particular reference date. The reference date is used to determine
|
|
* whether daylight savings time is in effect and needs to be figured into the offset
|
|
* that is returned (in other words, what is the adjusted GMT offset in this time zone
|
|
* at this particular date and time?). For the time zones produced by createTimeZone(),
|
|
* the reference data is specified according to the Gregorian calendar, and the date
|
|
* and time fields are local standard time.
|
|
*
|
|
* <p>Note: Don't call this method. Instead, call the getOffset(UDate...) overload,
|
|
* which returns both the raw and the DST offset for a given time. This method
|
|
* is retained only for backward compatibility.
|
|
*
|
|
* @param era The reference date's era
|
|
* @param year The reference date's year
|
|
* @param month The reference date's month (0-based; 0 is January)
|
|
* @param day The reference date's day-in-month (1-based)
|
|
* @param dayOfWeek The reference date's day-of-week (1-based; 1 is Sunday)
|
|
* @param millis The reference date's milliseconds in day, local standard time
|
|
* @param status Output param to filled in with a success or an error.
|
|
* @return The offset in milliseconds to add to GMT to get local time.
|
|
* @stable ICU 2.0
|
|
*/
|
|
virtual int32_t getOffset(uint8_t era, int32_t year, int32_t month, int32_t day,
|
|
uint8_t dayOfWeek, int32_t millis, UErrorCode& status) const = 0;
|
|
|
|
/**
|
|
* Gets the time zone offset, for current date, modified in case of
|
|
* daylight savings. This is the offset to add *to* UTC to get local time.
|
|
*
|
|
* <p>Note: Don't call this method. Instead, call the getOffset(UDate...) overload,
|
|
* which returns both the raw and the DST offset for a given time. This method
|
|
* is retained only for backward compatibility.
|
|
*
|
|
* @param era the era of the given date.
|
|
* @param year the year in the given date.
|
|
* @param month the month in the given date.
|
|
* Month is 0-based. e.g., 0 for January.
|
|
* @param day the day-in-month of the given date.
|
|
* @param dayOfWeek the day-of-week of the given date.
|
|
* @param milliseconds the millis in day in <em>standard</em> local time.
|
|
* @param monthLength the length of the given month in days.
|
|
* @param status Output param to filled in with a success or an error.
|
|
* @return the offset to add *to* GMT to get local time.
|
|
* @stable ICU 2.0
|
|
*/
|
|
virtual int32_t getOffset(uint8_t era, int32_t year, int32_t month, int32_t day,
|
|
uint8_t dayOfWeek, int32_t milliseconds,
|
|
int32_t monthLength, UErrorCode& status) const = 0;
|
|
|
|
/**
|
|
* Returns the time zone raw and GMT offset for the given moment
|
|
* in time. Upon return, local-millis = GMT-millis + rawOffset +
|
|
* dstOffset. All computations are performed in the proleptic
|
|
* Gregorian calendar. The default implementation in the TimeZone
|
|
* class delegates to the 8-argument getOffset().
|
|
*
|
|
* @param date moment in time for which to return offsets, in
|
|
* units of milliseconds from January 1, 1970 0:00 GMT, either GMT
|
|
* time or local wall time, depending on `local'.
|
|
* @param local if true, `date' is local wall time; otherwise it
|
|
* is in GMT time.
|
|
* @param rawOffset output parameter to receive the raw offset, that
|
|
* is, the offset not including DST adjustments
|
|
* @param dstOffset output parameter to receive the DST offset,
|
|
* that is, the offset to be added to `rawOffset' to obtain the
|
|
* total offset between local and GMT time. If DST is not in
|
|
* effect, this value is zero; otherwise it is a positive value,
|
|
* typically one hour.
|
|
* @param ec input-output error code
|
|
*
|
|
* @stable ICU 2.8
|
|
*/
|
|
virtual void getOffset(UDate date, UBool local, int32_t& rawOffset,
|
|
int32_t& dstOffset, UErrorCode& ec) const;
|
|
|
|
/**
|
|
* Sets the TimeZone's raw GMT offset (i.e., the number of milliseconds to add
|
|
* to GMT to get local time, before taking daylight savings time into account).
|
|
*
|
|
* @param offsetMillis The new raw GMT offset for this time zone.
|
|
* @stable ICU 2.0
|
|
*/
|
|
virtual void setRawOffset(int32_t offsetMillis) = 0;
|
|
|
|
/**
|
|
* Returns the TimeZone's raw GMT offset (i.e., the number of milliseconds to add
|
|
* to GMT to get local time, before taking daylight savings time into account).
|
|
*
|
|
* @return The TimeZone's raw GMT offset.
|
|
* @stable ICU 2.0
|
|
*/
|
|
virtual int32_t getRawOffset(void) const = 0;
|
|
|
|
/**
|
|
* Fills in "ID" with the TimeZone's ID.
|
|
*
|
|
* @param ID Receives this TimeZone's ID.
|
|
* @return A reference to 'ID'
|
|
* @stable ICU 2.0
|
|
*/
|
|
UnicodeString& getID(UnicodeString& ID) const;
|
|
|
|
/**
|
|
* Sets the TimeZone's ID to the specified value. This doesn't affect any other
|
|
* fields (for example, if you say<
|
|
* blockquote><pre>
|
|
* . TimeZone* foo = TimeZone::createTimeZone("America/New_York");
|
|
* . foo.setID("America/Los_Angeles");
|
|
* </pre>\htmlonly</blockquote>\endhtmlonly
|
|
* the time zone's GMT offset and daylight-savings rules don't change to those for
|
|
* Los Angeles. They're still those for New York. Only the ID has changed.)
|
|
*
|
|
* @param ID The new time zone ID.
|
|
* @stable ICU 2.0
|
|
*/
|
|
void setID(const UnicodeString& ID);
|
|
|
|
/**
|
|
* Enum for use with getDisplayName
|
|
* @stable ICU 2.4
|
|
*/
|
|
enum EDisplayType {
|
|
/**
|
|
* Selector for short display name
|
|
* @stable ICU 2.4
|
|
*/
|
|
SHORT = 1,
|
|
/**
|
|
* Selector for long display name
|
|
* @stable ICU 2.4
|
|
*/
|
|
LONG,
|
|
/**
|
|
* Selector for short generic display name
|
|
* @stable ICU 4.4
|
|
*/
|
|
SHORT_GENERIC,
|
|
/**
|
|
* Selector for long generic display name
|
|
* @stable ICU 4.4
|
|
*/
|
|
LONG_GENERIC,
|
|
/**
|
|
* Selector for short display name derived
|
|
* from time zone offset
|
|
* @stable ICU 4.4
|
|
*/
|
|
SHORT_GMT,
|
|
/**
|
|
* Selector for long display name derived
|
|
* from time zone offset
|
|
* @stable ICU 4.4
|
|
*/
|
|
LONG_GMT,
|
|
/**
|
|
* Selector for short display name derived
|
|
* from the time zone's fallback name
|
|
* @stable ICU 4.4
|
|
*/
|
|
SHORT_COMMONLY_USED,
|
|
/**
|
|
* Selector for long display name derived
|
|
* from the time zone's fallback name
|
|
* @stable ICU 4.4
|
|
*/
|
|
GENERIC_LOCATION
|
|
};
|
|
|
|
/**
|
|
* Returns a name of this time zone suitable for presentation to the user
|
|
* in the default locale.
|
|
* This method returns the long name, not including daylight savings.
|
|
* If the display name is not available for the locale,
|
|
* then this method returns a string in the localized GMT offset format
|
|
* such as <code>GMT[+-]HH:mm</code>.
|
|
* @param result the human-readable name of this time zone in the default locale.
|
|
* @return A reference to 'result'.
|
|
* @stable ICU 2.0
|
|
*/
|
|
UnicodeString& getDisplayName(UnicodeString& result) const;
|
|
|
|
/**
|
|
* Returns a name of this time zone suitable for presentation to the user
|
|
* in the specified locale.
|
|
* This method returns the long name, not including daylight savings.
|
|
* If the display name is not available for the locale,
|
|
* then this method returns a string in the localized GMT offset format
|
|
* such as <code>GMT[+-]HH:mm</code>.
|
|
* @param locale the locale in which to supply the display name.
|
|
* @param result the human-readable name of this time zone in the given locale
|
|
* or in the default locale if the given locale is not recognized.
|
|
* @return A reference to 'result'.
|
|
* @stable ICU 2.0
|
|
*/
|
|
UnicodeString& getDisplayName(const Locale& locale, UnicodeString& result) const;
|
|
|
|
/**
|
|
* Returns a name of this time zone suitable for presentation to the user
|
|
* in the default locale.
|
|
* If the display name is not available for the locale,
|
|
* then this method returns a string in the localized GMT offset format
|
|
* such as <code>GMT[+-]HH:mm</code>.
|
|
* @param daylight if true, return the daylight savings name.
|
|
* @param style
|
|
* @param result the human-readable name of this time zone in the default locale.
|
|
* @return A reference to 'result'.
|
|
* @stable ICU 2.0
|
|
*/
|
|
UnicodeString& getDisplayName(UBool daylight, EDisplayType style, UnicodeString& result) const;
|
|
|
|
/**
|
|
* Returns a name of this time zone suitable for presentation to the user
|
|
* in the specified locale.
|
|
* If the display name is not available for the locale,
|
|
* then this method returns a string in the localized GMT offset format
|
|
* such as <code>GMT[+-]HH:mm</code>.
|
|
* @param daylight if true, return the daylight savings name.
|
|
* @param style
|
|
* @param locale the locale in which to supply the display name.
|
|
* @param result the human-readable name of this time zone in the given locale
|
|
* or in the default locale if the given locale is not recognized.
|
|
* @return A refence to 'result'.
|
|
* @stable ICU 2.0
|
|
*/
|
|
UnicodeString& getDisplayName(UBool daylight, EDisplayType style, const Locale& locale, UnicodeString& result) const;
|
|
|
|
/**
|
|
* Queries if this time zone uses daylight savings time.
|
|
* @return true if this time zone uses daylight savings time,
|
|
* false, otherwise.
|
|
* <p><strong>Note:</strong>The default implementation of
|
|
* ICU TimeZone uses the tz database, which supports historic
|
|
* rule changes, for system time zones. With the implementation,
|
|
* there are time zones that used daylight savings time in the
|
|
* past, but no longer used currently. For example, Asia/Tokyo has
|
|
* never used daylight savings time since 1951. Most clients would
|
|
* expect that this method to return <code>FALSE</code> for such case.
|
|
* The default implementation of this method returns <code>TRUE</code>
|
|
* when the time zone uses daylight savings time in the current
|
|
* (Gregorian) calendar year.
|
|
* <p>In Java 7, <code>observesDaylightTime()</code> was added in
|
|
* addition to <code>useDaylightTime()</code>. In Java, <code>useDaylightTime()</code>
|
|
* only checks if daylight saving time is observed by the last known
|
|
* rule. This specification might not be what most users would expect
|
|
* if daylight saving time is currently observed, but not scheduled
|
|
* in future. In this case, Java's <code>userDaylightTime()</code> returns
|
|
* <code>false</code>. To resolve the issue, Java 7 added <code>observesDaylightTime()</code>,
|
|
* which takes the current rule into account. The method <code>observesDaylightTime()</code>
|
|
* was added in ICU4J for supporting API signature compatibility with JDK.
|
|
* In general, ICU4C also provides JDK compatible methods, but the current
|
|
* implementation <code>userDaylightTime()</code> serves the purpose
|
|
* (takes the current rule into account), <code>observesDaylightTime()</code>
|
|
* is not added in ICU4C. In addition to <code>useDaylightTime()</code>, ICU4C
|
|
* <code>BasicTimeZone</code> class (Note that <code>TimeZone::createTimeZone(const UnicodeString &ID)</code>
|
|
* always returns a <code>BasicTimeZone</code>) provides a series of methods allowing
|
|
* historic and future time zone rule iteration, so you can check if daylight saving
|
|
* time is observed or not within a given period.
|
|
*
|
|
* @stable ICU 2.0
|
|
*/
|
|
virtual UBool useDaylightTime(void) const = 0;
|
|
|
|
/**
|
|
* Queries if the given date is in daylight savings time in
|
|
* this time zone.
|
|
* This method is wasteful since it creates a new GregorianCalendar and
|
|
* deletes it each time it is called. This is a deprecated method
|
|
* and provided only for Java compatibility.
|
|
*
|
|
* @param date the given UDate.
|
|
* @param status Output param filled in with success/error code.
|
|
* @return true if the given date is in daylight savings time,
|
|
* false, otherwise.
|
|
* @deprecated ICU 2.4. Use Calendar::inDaylightTime() instead.
|
|
*/
|
|
virtual UBool inDaylightTime(UDate date, UErrorCode& status) const = 0;
|
|
|
|
/**
|
|
* Returns true if this zone has the same rule and offset as another zone.
|
|
* That is, if this zone differs only in ID, if at all.
|
|
* @param other the <code>TimeZone</code> object to be compared with
|
|
* @return true if the given zone is the same as this one,
|
|
* with the possible exception of the ID
|
|
* @stable ICU 2.0
|
|
*/
|
|
virtual UBool hasSameRules(const TimeZone& other) const;
|
|
|
|
/**
|
|
* Clones TimeZone objects polymorphically. Clients are responsible for deleting
|
|
* the TimeZone object cloned.
|
|
*
|
|
* @return A new copy of this TimeZone object.
|
|
* @stable ICU 2.0
|
|
*/
|
|
virtual TimeZone* clone(void) const = 0;
|
|
|
|
/**
|
|
* Return the class ID for this class. This is useful only for
|
|
* comparing to a return value from getDynamicClassID().
|
|
* @return The class ID for all objects of this class.
|
|
* @stable ICU 2.0
|
|
*/
|
|
static UClassID U_EXPORT2 getStaticClassID(void);
|
|
|
|
/**
|
|
* Returns a unique class ID POLYMORPHICALLY. This method is to
|
|
* implement a simple version of RTTI, since not all C++ compilers support genuine
|
|
* RTTI. Polymorphic operator==() and clone() methods call this method.
|
|
* <P>
|
|
* Concrete subclasses of TimeZone must use the UOBJECT_DEFINE_RTTI_IMPLEMENTATION
|
|
* macro from uobject.h in their implementation to provide correct RTTI information.
|
|
* @return The class ID for this object. All objects of a given class have the
|
|
* same class ID. Objects of other classes have different class IDs.
|
|
* @stable ICU 2.0
|
|
*/
|
|
virtual UClassID getDynamicClassID(void) const = 0;
|
|
|
|
/**
|
|
* Returns the amount of time to be added to local standard time
|
|
* to get local wall clock time.
|
|
* <p>
|
|
* The default implementation always returns 3600000 milliseconds
|
|
* (i.e., one hour) if this time zone observes Daylight Saving
|
|
* Time. Otherwise, 0 (zero) is returned.
|
|
* <p>
|
|
* If an underlying TimeZone implementation subclass supports
|
|
* historical Daylight Saving Time changes, this method returns
|
|
* the known latest daylight saving value.
|
|
*
|
|
* @return the amount of saving time in milliseconds
|
|
* @stable ICU 3.6
|
|
*/
|
|
virtual int32_t getDSTSavings() const;
|
|
|
|
/**
|
|
* Gets the region code associated with the given
|
|
* system time zone ID. The region code is either ISO 3166
|
|
* 2-letter country code or UN M.49 3-digit area code.
|
|
* When the time zone is not associated with a specific location,
|
|
* for example - "Etc/UTC", "EST5EDT", then this method returns
|
|
* "001" (UN M.49 area code for World).
|
|
*
|
|
* @param id The system time zone ID.
|
|
* @param region Output buffer for receiving the region code.
|
|
* @param capacity The size of the output buffer.
|
|
* @param status Receives the status. When the given time zone ID
|
|
* is not a known system time zone ID,
|
|
* U_ILLEGAL_ARGUMENT_ERROR is set.
|
|
* @return The length of the output region code.
|
|
* @stable ICU 4.8
|
|
*/
|
|
static int32_t U_EXPORT2 getRegion(const UnicodeString& id,
|
|
char *region, int32_t capacity, UErrorCode& status);
|
|
|
|
protected:
|
|
|
|
/**
|
|
* Default constructor. ID is initialized to the empty string.
|
|
* @stable ICU 2.0
|
|
*/
|
|
TimeZone();
|
|
|
|
/**
|
|
* Construct a TimeZone with a given ID.
|
|
* @param id a system time zone ID
|
|
* @stable ICU 2.0
|
|
*/
|
|
TimeZone(const UnicodeString &id);
|
|
|
|
/**
|
|
* Copy constructor.
|
|
* @param source the object to be copied.
|
|
* @stable ICU 2.0
|
|
*/
|
|
TimeZone(const TimeZone& source);
|
|
|
|
/**
|
|
* Default assignment operator.
|
|
* @param right the object to be copied.
|
|
* @stable ICU 2.0
|
|
*/
|
|
TimeZone& operator=(const TimeZone& right);
|
|
|
|
#ifndef U_HIDE_INTERNAL_API
|
|
/**
|
|
* Utility function. For internally loading rule data.
|
|
* @param top Top resource bundle for tz data
|
|
* @param ruleid ID of rule to load
|
|
* @param oldbundle Old bundle to reuse or NULL
|
|
* @param status Status parameter
|
|
* @return either a new bundle or *oldbundle
|
|
* @internal
|
|
*/
|
|
static UResourceBundle* loadRule(const UResourceBundle* top, const UnicodeString& ruleid, UResourceBundle* oldbundle, UErrorCode&status);
|
|
#endif /* U_HIDE_INTERNAL_API */
|
|
|
|
private:
|
|
friend class ZoneMeta;
|
|
|
|
|
|
static TimeZone* createCustomTimeZone(const UnicodeString&); // Creates a time zone based on the string.
|
|
|
|
/**
|
|
* Finds the given ID in the Olson tzdata. If the given ID is found in the tzdata,
|
|
* returns the pointer to the ID resource. This method is exposed through ZoneMeta class
|
|
* for ICU internal implementation and useful for building hashtable using a time zone
|
|
* ID as a key.
|
|
* @param id zone id string
|
|
* @return the pointer of the ID resource, or NULL.
|
|
*/
|
|
static const char16_t* findID(const UnicodeString& id);
|
|
|
|
/**
|
|
* Resolve a link in Olson tzdata. When the given id is known and it's not a link,
|
|
* the id itself is returned. When the given id is known and it is a link, then
|
|
* dereferenced zone id is returned. When the given id is unknown, then it returns
|
|
* NULL.
|
|
* @param id zone id string
|
|
* @return the dereferenced zone or NULL
|
|
*/
|
|
static const char16_t* dereferOlsonLink(const UnicodeString& id);
|
|
|
|
/**
|
|
* Returns the region code associated with the given zone,
|
|
* or NULL if the zone is not known.
|
|
* @param id zone id string
|
|
* @return the region associated with the given zone
|
|
*/
|
|
static const char16_t* getRegion(const UnicodeString& id);
|
|
|
|
public:
|
|
#ifndef U_HIDE_INTERNAL_API
|
|
/**
|
|
* Returns the region code associated with the given zone,
|
|
* or NULL if the zone is not known.
|
|
* @param id zone id string
|
|
* @param status Status parameter
|
|
* @return the region associated with the given zone
|
|
* @internal
|
|
*/
|
|
static const char16_t* getRegion(const UnicodeString& id, UErrorCode& status);
|
|
#endif /* U_HIDE_INTERNAL_API */
|
|
|
|
private:
|
|
/**
|
|
* Parses the given custom time zone identifier
|
|
* @param id id A string of the form GMT[+-]hh:mm, GMT[+-]hhmm, or
|
|
* GMT[+-]hh.
|
|
* @param sign Receves parsed sign, 1 for positive, -1 for negative.
|
|
* @param hour Receives parsed hour field
|
|
* @param minute Receives parsed minute field
|
|
* @param second Receives parsed second field
|
|
* @return Returns TRUE when the given custom id is valid.
|
|
*/
|
|
static UBool parseCustomID(const UnicodeString& id, int32_t& sign, int32_t& hour,
|
|
int32_t& minute, int32_t& second);
|
|
|
|
/**
|
|
* Parse a custom time zone identifier and return the normalized
|
|
* custom time zone identifier for the given custom id string.
|
|
* @param id a string of the form GMT[+-]hh:mm, GMT[+-]hhmm, or
|
|
* GMT[+-]hh.
|
|
* @param normalized Receives the normalized custom ID
|
|
* @param status Receives the status. When the input ID string is invalid,
|
|
* U_ILLEGAL_ARGUMENT_ERROR is set.
|
|
* @return The normalized custom id string.
|
|
*/
|
|
static UnicodeString& getCustomID(const UnicodeString& id, UnicodeString& normalized,
|
|
UErrorCode& status);
|
|
|
|
/**
|
|
* Returns the normalized custome time zone ID for the given offset fields.
|
|
* @param hour offset hours
|
|
* @param min offset minutes
|
|
* @param sec offset seconds
|
|
* @param negative sign of the offset, TRUE for negative offset.
|
|
* @param id Receves the format result (normalized custom ID)
|
|
* @return The reference to id
|
|
*/
|
|
static UnicodeString& formatCustomID(int32_t hour, int32_t min, int32_t sec,
|
|
UBool negative, UnicodeString& id);
|
|
|
|
UnicodeString fID; // this time zone's ID
|
|
|
|
friend class TZEnumeration;
|
|
};
|
|
|
|
|
|
// -------------------------------------
|
|
|
|
inline UnicodeString&
|
|
TimeZone::getID(UnicodeString& ID) const
|
|
{
|
|
ID = fID;
|
|
return ID;
|
|
}
|
|
|
|
// -------------------------------------
|
|
|
|
inline void
|
|
TimeZone::setID(const UnicodeString& ID)
|
|
{
|
|
fID = ID;
|
|
}
|
|
U_NAMESPACE_END
|
|
|
|
#endif /* #if !UCONFIG_NO_FORMATTING */
|
|
|
|
#endif //_TIMEZONE
|
|
//eof
|