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ICU-8266 Clarify the behavior of TimeZone::useDaylightTime() in the API doc.

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X-SVN-Rev: 29396
This commit is contained in:
Yoshito Umaoka 2011-02-04 04:13:43 +00:00
parent 74a4461b49
commit c5d01fb5d3
1 changed files with 11 additions and 1 deletions
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12
icu4c/source/i18n/unicode/timezone.h
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@ -1,5 +1,5 @@
/*************************************************************************
* Copyright (c) 1997-2010, International Business Machines Corporation
* Copyright (c) 1997-2011, International Business Machines Corporation
* and others. All Rights Reserved.
**************************************************************************
*
@ -554,6 +554,16 @@ public:
* 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.
* @stable ICU 2.0
*/
virtual UBool useDaylightTime(void) const = 0;