Calendar is an abstract base class for converting between
* a UDate object and a set of integer fields such as
* YEAR, MONTH, DAY, HOUR,
* and so on. (A UDate object represents a specific instant in
* time with millisecond precision. See
* {@link UDate}
* for information about the UDate class.)
*
*
* Subclasses of Calendar interpret a UDate
* according to the rules of a specific calendar system. The JDK
* provides one concrete subclass of Calendar:
* GregorianCalendar. Future subclasses could represent
* the various types of lunar calendars in use in many parts of the world.
*
*
* Like other locale-sensitive classes, Calendar provides a
* class method, getInstance, for getting a generally useful
* object of this type. Calendar's getInstance method
* returns a GregorianCalendar object whose
* time fields have been initialized with the current date and time:
*
** ** Calendar rightNow = Calendar.getInstance(); **
* A Calendar object can produce all the time field values
* needed to implement the date-time formatting for a particular language
* and calendar style (for example, Japanese-Gregorian, Japanese-Traditional).
*
*
* When computing a UDate from time fields, two special circumstances
* may arise: there may be insufficient information to compute the
* UDate (such as only year and month but no day in the month),
* or there may be inconsistent information (such as "Tuesday, July 15, 1996"
* -- July 15, 1996 is actually a Monday).
*
*
* Insufficient information. The calendar will use default * information to specify the missing fields. This may vary by calendar; for * the Gregorian calendar, the default for a field is the same as that of the * start of the epoch: i.e., YEAR = 1970, MONTH = JANUARY, DATE = 1, etc. * *
* Inconsistent information. If fields conflict, the calendar * will give preference to fields set more recently. For example, when * determining the day, the calendar will look for one of the following * combinations of fields. The most recent combination, as determined by the * most recently set single field, will be used. * *
** * For the time of day: * ** MONTH + DAY_OF_MONTH * MONTH + WEEK_OF_MONTH + DAY_OF_WEEK * MONTH + DAY_OF_WEEK_IN_MONTH + DAY_OF_WEEK * DAY_OF_YEAR * DAY_OF_WEEK + WEEK_OF_YEAR **
** ** HOUR_OF_DAY * AM_PM + HOUR **
* Note: for some non-Gregorian calendars, different * fields may be necessary for complete disambiguation. For example, a full * specification of the historial Arabic astronomical calendar requires year, * month, day-of-month and day-of-week in some cases. * *
* Note: There are certain possible ambiguities in * interpretation of certain singular times, which are resolved in the * following ways: *
* The date or time format strings are not part of the definition of a * calendar, as those must be modifiable or overridable by the user at * runtime. Use {@link DateFormat} * to format dates. * *
* Calendar provides an API for field "rolling", where fields
* can be incremented or decremented, but wrap around. For example, rolling the
* month up in the date December 12, 1996 results in
* January 12, 1996.
*
*
* Calendar also provides a date arithmetic function for
* adding the specified (signed) amount of time to a particular time field.
* For example, subtracting 5 days from the date September 12, 1996
* results in September 7, 1996.
*
*/
class U_I18N_API Calendar {
public:
/**
* Field IDs for date and time. Used to specify date/time fields. ERA is calendar
* specific. Example ranges given are for illustration only; see specific Calendar
* subclasses for actual ranges.
*/
enum EDateFields {
ERA, // Example: 0..1
YEAR, // Example: 1..big number
MONTH, // Example: 0..11
WEEK_OF_YEAR, // Example: 1..53
WEEK_OF_MONTH, // Example: 1..4
DATE, // Example: 1..31
DAY_OF_YEAR, // Example: 1..365
DAY_OF_WEEK, // Example: 1..7
DAY_OF_WEEK_IN_MONTH, // Example: 1..4, may be specified as -1
AM_PM, // Example: 0..1
HOUR, // Example: 0..11
HOUR_OF_DAY, // Example: 0..23
MINUTE, // Example: 0..59
SECOND, // Example: 0..59
MILLISECOND, // Example: 0..999
ZONE_OFFSET, // Example: -12*U_MILLIS_PER_HOUR..12*U_MILLIS_PER_HOUR
DST_OFFSET, // Example: 0 or U_MILLIS_PER_HOUR
// here will go names for 'Y' and 'e'
YEAR_WOY, // 'Y' Example: 1..big number
DOW_LOCAL, // 'e' Example: 1..7
FIELD_COUNT,
DAY_OF_MONTH = DATE // Synonyms
};
/**
* Useful constant for days of week. Note: Calendar day-of-week is 1-based. Clients
* who create locale resources for the field of first-day-of-week should be aware of
* this. For instance, in US locale, first-day-of-week is set to 1, i.e., SUNDAY.
*/
enum EDaysOfWeek {
SUNDAY = 1,
MONDAY,
TUESDAY,
WEDNESDAY,
THURSDAY,
FRIDAY,
SATURDAY
};
/**
* Useful constants for month. Note: Calendar month is 0-based.
*/
enum EMonths {
JANUARY,
FEBRUARY,
MARCH,
APRIL,
MAY,
JUNE,
JULY,
AUGUST,
SEPTEMBER,
OCTOBER,
NOVEMBER,
DECEMBER,
UNDECIMBER
};
/**
* Useful constants for hour in 12-hour clock. Used in GregorianCalendar.
*/
enum EAmpm {
AM,
PM
};
/**
* destructor
* @stable
*/
virtual ~Calendar();
/**
* Create and return a polymorphic copy of this calendar.
* @stable
*/
virtual Calendar* clone(void) const = 0;
/**
* Creates a Calendar using the default timezone and locale. Clients are responsible
* for deleting the object returned.
*
* @param success Indicates the success/failure of Calendar creation. Filled in
* with U_ZERO_ERROR if created successfully, set to a failure result
* otherwise.
* @return A Calendar if created successfully. NULL otherwise.
* @stable
*/
static Calendar* createInstance(UErrorCode& success);
/**
* Creates a Calendar using the given timezone and the default locale.
* The Calendar takes ownership of zoneToAdopt; the
* client must not delete it.
*
* @param zoneToAdopt The given timezone to be adopted.
* @param success Indicates the success/failure of Calendar creation. Filled in
* with U_ZERO_ERROR if created successfully, set to a failure result
* otherwise.
* @return A Calendar if created successfully. NULL otherwise.
* @stable
*/
static Calendar* createInstance(TimeZone* zoneToAdopt, UErrorCode& success);
/**
* Creates a Calendar using the given timezone and the default locale. The TimeZone
* is _not_ adopted; the client is still responsible for deleting it.
*
* @param zone The timezone.
* @param success Indicates the success/failure of Calendar creation. Filled in
* with U_ZERO_ERROR if created successfully, set to a failure result
* otherwise.
* @return A Calendar if created successfully. NULL otherwise.
* @stable
*/
static Calendar* createInstance(const TimeZone& zone, UErrorCode& success);
/**
* Creates a Calendar using the default timezone and the given locale.
*
* @param aLocale The given locale.
* @param success Indicates the success/failure of Calendar creation. Filled in
* with U_ZERO_ERROR if created successfully, set to a failure result
* otherwise.
* @return A Calendar if created successfully. NULL otherwise.
* @stable
*/
static Calendar* createInstance(const Locale& aLocale, UErrorCode& success);
/**
* Creates a Calendar using the given timezone and given locale.
* The Calendar takes ownership of zoneToAdopt; the
* client must not delete it.
*
* @param zoneToAdopt The given timezone to be adopted.
* @param aLocale The given locale.
* @param success Indicates the success/failure of Calendar creation. Filled in
* with U_ZERO_ERROR if created successfully, set to a failure result
* otherwise.
* @return A Calendar if created successfully. NULL otherwise.
* @stable
*/
static Calendar* createInstance(TimeZone* zoneToAdopt, const Locale& aLocale, UErrorCode& success);
/**
* Gets a Calendar using the given timezone and given locale. The TimeZone
* is _not_ adopted; the client is still responsible for deleting it.
*
* @param zone The timezone.
* @param aLocale The given locale.
* @param success Indicates the success/failure of Calendar creation. Filled in
* with U_ZERO_ERROR if created successfully, set to a failure result
* otherwise.
* @return A Calendar if created successfully. NULL otherwise.
* @stable
*/
static Calendar* createInstance(const TimeZone& zoneToAdopt, const Locale& aLocale, UErrorCode& success);
/**
* Returns a list of the locales for which Calendars are installed.
*
* @param count Number of locales returned.
* @return An array of Locale objects representing the set of locales for which
* Calendars are installed. The system retains ownership of this list;
* the caller must NOT delete it.
* @stable
*/
static const Locale* getAvailableLocales(int32_t& count);
/**
* Returns the current UTC (GMT) time measured in milliseconds since 0:00:00 on 1/1/70
* (derived from the system time).
*
* @return The current UTC time in milliseconds.
* @stable
*/
static UDate getNow(void);
/**
* Gets this Calendar's time as milliseconds. May involve recalculation of time due
* to previous calls to set time field values. The time specified is non-local UTC
* (GMT) time. Although this method is const, this object may actually be changed
* (semantically const).
*
* @param status Output param set to success/failure code on exit. If any value
* previously set in the time field is invalid or restricted by
* leniency, this will be set to an error status.
* @return The current time in UTC (GMT) time, or zero if the operation
* failed.
* @stable
*/
inline UDate getTime(UErrorCode& status) const { return getTimeInMillis(status); }
/**
* Sets this Calendar's current time with the given UDate. The time specified should
* be in non-local UTC (GMT) time.
*
* @param date The given UDate in UTC (GMT) time.
* @stable
*/
inline void setTime(UDate date, UErrorCode& status) { setTimeInMillis(date, status); }
/**
* Compares the equality of two Calendar objects. Objects of different subclasses
* are considered unequal. This comparison is very exacting; two Calendar objects
* must be in exactly the same state to be considered equal. To compare based on the
* represented time, use equals() instead.
*
* @param that The Calendar object to be compared with.
* @return True if the given Calendar is the same as this Calendar; false
* otherwise.
* @stable
*/
virtual UBool operator==(const Calendar& that) const;
/**
* Compares the inequality of two Calendar objects.
*
* @param that The Calendar object to be compared with.
* @return True if the given Calendar is not the same as this Calendar; false
* otherwise.
* @stable
*/
UBool operator!=(const Calendar& that) const {return !operator==(that);}
/**
* Compares the Calendar time, whereas Calendar::operator== compares the equality of
* Calendar objects.
*
* @param when The Calendar to be compared with this Calendar. Although this is a
* const parameter, the object may be modified physically
* (semantically const).
* @param status Output param set to success/failure code on exit. If any value
* previously set in the time field is invalid or restricted by
* leniency, this will be set to an error status.
* @return True if the current time of this Calendar is equal to the time of
* Calendar when; false otherwise.
* @stable
*/
UBool equals(const Calendar& when, UErrorCode& status) const;
/**
* Returns true if this Calendar's current time is before "when"'s current time.
*
* @param when The Calendar to be compared with this Calendar. Although this is a
* const parameter, the object may be modified physically
* (semantically const).
* @param status Output param set to success/failure code on exit. If any value
* previously set in the time field is invalid or restricted by
* leniency, this will be set to an error status.
* @return True if the current time of this Calendar is before the time of
* Calendar when; false otherwise.
* @stable
*/
UBool before(const Calendar& when, UErrorCode& status) const;
/**
* Returns true if this Calendar's current time is after "when"'s current time.
*
* @param when The Calendar to be compared with this Calendar. Although this is a
* const parameter, the object may be modified physically
* (semantically const).
* @param status Output param set to success/failure code on exit. If any value
* previously set in the time field is invalid or restricted by
* leniency, this will be set to an error status.
* @return True if the current time of this Calendar is after the time of
* Calendar when; false otherwise.
* @stable
*/
UBool after(const Calendar& when, UErrorCode& status) const;
/**
* Return true if another Calendar object is equivalent to this one. An equivalent
* Calendar will behave exactly as this one does, but may be set to a different time.
* @deprecated not in Java API!
*/
virtual UBool equivalentTo(const Calendar& other) const;
/**
* UDate Arithmetic function. Adds the specified (signed) amount of time to the given
* time field, based on the calendar's rules. For example, to subtract 5 days from
* the current time of the calendar, call add(Calendar::DATE, -5). When adding on
* the month or Calendar::MONTH field, other fields like date might conflict and
* need to be changed. For instance, adding 1 month on the date 01/31/96 will result
* in 02/29/96.
*
* @param field Specifies which date field to modify.
* @param amount The amount of time to be added to the field, in the natural unit
* for that field (e.g., days for the day fields, hours for the hour
* field.)
* @param status Output param set to success/failure code on exit. If any value
* previously set in the time field is invalid or restricted by
* leniency, this will be set to an error status.
* @stable
*/
virtual void add(EDateFields field, int32_t amount, UErrorCode& status) = 0;
/**
* Time Field Rolling function. Rolls (up/down) a single unit of time on the given
* time field. For example, to roll the current date up by one day, call
* roll(Calendar::DATE, true). When rolling on the year or Calendar::YEAR field, it
* will roll the year value in the range between getMinimum(Calendar::YEAR) and the
* value returned by getMaximum(Calendar::YEAR). When rolling on the month or
* Calendar::MONTH field, other fields like date might conflict and, need to be
* changed. For instance, rolling the month up on the date 01/31/96 will result in
* 02/29/96. Rolling up always means rolling forward in time; e.g., rolling the year
* up on "100 BC" will result in "99 BC", for Gregorian calendar. When rolling on the
* hour-in-day or Calendar::HOUR_OF_DAY field, it will roll the hour value in the range
* between 0 and 23, which is zero-based.
*
* NOTE: Do not use this method -- use roll(EDateFields, int, UErrorCode&) instead. * * @param field The time field. * @param up Indicates if the value of the specified time field is to be rolled * up or rolled down. Use true if rolling up, false otherwise. * @param status Output param set to success/failure code on exit. If any value * previously set in the time field is invalid or restricted by * leniency, this will be set to an error status. * @stable */ void roll(EDateFields field, UBool up, UErrorCode& status); /** * Time Field Rolling function. Rolls by the given amount on the given * time field. For example, to roll the current date up by one day, call * roll(Calendar::DATE, +1, status). When rolling on the month or * Calendar::MONTH field, other fields like date might conflict and, need to be * changed. For instance, rolling the month up on the date 01/31/96 will result in * 02/29/96. Rolling by a positive value always means rolling forward in time; * e.g., rolling the year by +1 on "100 BC" will result in "99 BC", for Gregorian * calendar. When rolling on the hour-in-day or Calendar::HOUR_OF_DAY field, it will * roll the hour value in the range between 0 and 23, which is zero-based. *
* The only difference between roll() and add() is that roll() does not change
* the value of more significant fields when it reaches the minimum or maximum
* of its range, whereas add() does.
*
* @param field The time field.
* @param amount Indicates amount to roll.
* @param status Output param set to success/failure code on exit. If any value
* previously set in the time field is invalid, this will be set to
* an error status.
* @stable
*/
virtual void roll(EDateFields field, int32_t amount, UErrorCode& status) = 0;
/**
* Return the difference between the given time and the time this
* calendar object is set to. If this calendar is set
* before the given time, the returned value will be
* positive. If this calendar is set after the given
* time, the returned value will be negative. The
* field parameter specifies the units of the return
* value. For example, if fieldDifference(when,
* Calendar.MONTH) returns 3, then this calendar is set to
* 3 months before when, and possibly some addition
* time less than one month.
*
*
As a side effect of this call, this calendar is advanced
* toward when by the given amount. That is, calling
* this method has the side effect of calling add(field,
* n), where n is the return value.
*
*
Usage: To use this method, call it first with the largest * field of interest, then with progressively smaller fields. For * example: * *
* int y = cal.fieldDifference(when, Calendar.YEAR);
* int m = cal.fieldDifference(when, Calendar.MONTH);
* int d = cal.fieldDifference(when, Calendar.DATE);
*
* computes the difference between cal and
* when in years, months, and days.
*
* Note: fieldDifference() is
* asymmetrical. That is, in the following code:
*
*
* cal.setTime(date1);
* int m1 = cal.fieldDifference(date2, Calendar.MONTH);
* int d1 = cal.fieldDifference(date2, Calendar.DATE);
* cal.setTime(date2);
* int m2 = cal.fieldDifference(date1, Calendar.MONTH);
* int d2 = cal.fieldDifference(date1, Calendar.DATE);
*
* one might expect that m1 == -m2 && d1 == -d2.
* However, this is not generally the case, because of
* irregularities in the underlying calendar system (e.g., the
* Gregorian calendar has a varying number of days per month).
*
* @param when the date to compare this calendar's time to
* @param field the field in which to compute the result
* @return the difference, either positive or negative, between
* this calendar's time and when, in terms of
* field.
*/
virtual int32_t fieldDifference(UDate when, EDateFields field, UErrorCode& status);
/**
* Sets the calendar's time zone to be the one passed in. The Calendar takes ownership
* of the TimeZone; the caller is no longer responsible for deleting it. If the
* given time zone is NULL, this function has no effect.
*
* @param value The given time zone.
* @stable
*/
void adoptTimeZone(TimeZone* value);
/**
* Sets the calendar's time zone to be the same as the one passed in. The TimeZone
* passed in is _not_ adopted; the client is still responsible for deleting it.
*
* @param value The given time zone.
* @stable
*/
void setTimeZone(const TimeZone& zone);
/**
* Returns a reference to the time zone owned by this calendar. The returned reference
* is only valid until clients make another call to adoptTimeZone or setTimeZone,
* or this Calendar is destroyed.
*
* @return The time zone object associated with this calendar.
* @stable
*/
const TimeZone& getTimeZone(void) const;
/**
* Returns the time zone owned by this calendar. The caller owns the returned object
* and must delete it when done. After this call, the new time zone associated
* with this Calendar is the default TimeZone as returned by TimeZone::createDefault().
*
* @return The time zone object which was associated with this calendar.
* @stable
*/
TimeZone* orphanTimeZone(void);
/**
* Queries if the current date for this Calendar is in Daylight Savings Time.
*
* @param status Fill-in parameter which receives the status of this operation.
* @return True if the current date for this Calendar is in Daylight Savings Time,
* false, otherwise.
* @stable
*/
virtual UBool inDaylightTime(UErrorCode& status) const = 0;
/**
* Specifies whether or not date/time interpretation is to be lenient. With lenient
* interpretation, a date such as "February 942, 1996" will be treated as being
* equivalent to the 941st day after February 1, 1996. With strict interpretation,
* such dates will cause an error when computing time from the time field values
* representing the dates.
*
* @param lenient True specifies date/time interpretation to be lenient.
*
* @see DateFormat#setLenient
* @stable
*/
void setLenient(UBool lenient);
/**
* Tells whether date/time interpretation is to be lenient.
*
* @return True tells that date/time interpretation is to be lenient.
* @stable
*/
UBool isLenient(void) const;
/**
* Sets what the first day of the week is; e.g., Sunday in US, Monday in France.
*
* @param value The given first day of the week.
* @stable
*/
void setFirstDayOfWeek(EDaysOfWeek value);
/**
* Gets what the first day of the week is; e.g., Sunday in US, Monday in France.
*
* @return The first day of the week.
* @stable
*/
EDaysOfWeek getFirstDayOfWeek(void) const;
/**
* Sets what the minimal days required in the first week of the year are; For
* example, if the first week is defined as one that contains the first day of the
* first month of a year, call the method with value 1. If it must be a full week,
* use value 7.
*
* @param value The given minimal days required in the first week of the year.
* @stable
*/
void setMinimalDaysInFirstWeek(uint8_t value);
/**
* Gets what the minimal days required in the first week of the year are; e.g., if
* the first week is defined as one that contains the first day of the first month
* of a year, getMinimalDaysInFirstWeek returns 1. If the minimal days required must
* be a full week, getMinimalDaysInFirstWeek returns 7.
*
* @return The minimal days required in the first week of the year.
* @stable
*/
uint8_t getMinimalDaysInFirstWeek(void) const;
/**
* Gets the minimum value for the given time field. e.g., for Gregorian
* DAY_OF_MONTH, 1.
*
* @param field The given time field.
* @return The minimum value for the given time field.
* @stable
*/
virtual int32_t getMinimum(EDateFields field) const = 0;
/**
* Gets the maximum value for the given time field. e.g. for Gregorian DAY_OF_MONTH,
* 31.
*
* @param field The given time field.
* @return The maximum value for the given time field.
* @stable
*/
virtual int32_t getMaximum(EDateFields field) const = 0;
/**
* Gets the highest minimum value for the given field if varies. Otherwise same as
* getMinimum(). For Gregorian, no difference.
*
* @param field The given time field.
* @return The highest minimum value for the given time field.
* @stable
*/
virtual int32_t getGreatestMinimum(EDateFields field) const = 0;
/**
* Gets the lowest maximum value for the given field if varies. Otherwise same as
* getMaximum(). e.g., for Gregorian DAY_OF_MONTH, 28.
*
* @param field The given time field.
* @return The lowest maximum value for the given time field.
* @stable
*/
virtual int32_t getLeastMaximum(EDateFields field) const = 0;
/**
* Return the minimum value that this field could have, given the current date.
* For the Gregorian calendar, this is the same as getMinimum() and getGreatestMinimum().
*
* The version of this function on Calendar uses an iterative algorithm to determine the
* actual minimum value for the field. There is almost always a more efficient way to
* accomplish this (in most cases, you can simply return getMinimum()). GregorianCalendar
* overrides this function with a more efficient implementation.
*
* @param field the field to determine the minimum of
* @return the minimum of the given field for the current date of this Calendar
* @stable
*/
int32_t getActualMinimum(EDateFields field, UErrorCode& status) const;
/**
* Return the maximum value that this field could have, given the current date.
* For example, with the date "Feb 3, 1997" and the DAY_OF_MONTH field, the actual
* maximum would be 28; for "Feb 3, 1996" it s 29. Similarly for a Hebrew calendar,
* for some years the actual maximum for MONTH is 12, and for others 13.
*
* The version of this function on Calendar uses an iterative algorithm to determine the
* actual maximum value for the field. There is almost always a more efficient way to
* accomplish this (in most cases, you can simply return getMaximum()). GregorianCalendar
* overrides this function with a more efficient implementation.
*
* @param field the field to determine the maximum of
* @return the maximum of the given field for the current date of this Calendar
* @stable
*/
int32_t getActualMaximum(EDateFields field, UErrorCode& status) const;
/**
* Gets the value for a given time field. Recalculate the current time field values
* if the time value has been changed by a call to setTime(). Return zero for unset
* fields if any fields have been explicitly set by a call to set(). To force a
* recomputation of all fields regardless of the previous state, call complete().
* This method is semantically const, but may alter the object in memory.
*
* @param field The given time field.
* @param status Fill-in parameter which receives the status of the operation.
* @return The value for the given time field, or zero if the field is unset,
* and set() has been called for any other field.
* @stable
*/
int32_t get(EDateFields field, UErrorCode& status) const;
/**
* Determines if the given time field has a value set. This can affect in the
* resolving of time in Calendar. Unset fields have a value of zero, by definition.
*
* @return True if the given time field has a value set; false otherwise.
* @stable
*/
UBool isSet(EDateFields field) const;
/**
* Sets the given time field with the given value.
*
* @param field The given time field.
* @param value The value to be set for the given time field.
* @stable
*/
void set(EDateFields field, int32_t value);
/**
* Sets the values for the fields YEAR, MONTH, and DATE. Other field values are
* retained; call clear() first if this is not desired.
*
* @param year The value used to set the YEAR time field.
* @param month The value used to set the MONTH time field. Month value is 0-based.
* e.g., 0 for January.
* @param date The value used to set the DATE time field.
* @stable
*/
void set(int32_t year, int32_t month, int32_t date);
/**
* Sets the values for the fields YEAR, MONTH, DATE, HOUR_OF_DAY, and MINUTE. Other
* field values are retained; call clear() first if this is not desired.
*
* @param year The value used to set the YEAR time field.
* @param month The value used to set the MONTH time field. Month value is
* 0-based. E.g., 0 for January.
* @param date The value used to set the DATE time field.
* @param hour The value used to set the HOUR_OF_DAY time field.
* @param minute The value used to set the MINUTE time field.
* @stable
*/
void set(int32_t year, int32_t month, int32_t date, int32_t hour, int32_t minute);
/**
* Sets the values for the fields YEAR, MONTH, DATE, HOUR_OF_DAY, MINUTE, and SECOND.
* Other field values are retained; call clear() first if this is not desired.
*
* @param year The value used to set the YEAR time field.
* @param month The value used to set the MONTH time field. Month value is
* 0-based. E.g., 0 for January.
* @param date The value used to set the DATE time field.
* @param hour The value used to set the HOUR_OF_DAY time field.
* @param minute The value used to set the MINUTE time field.
* @param second The value used to set the SECOND time field.
* @stable
*/
void set(int32_t year, int32_t month, int32_t date, int32_t hour, int32_t minute, int32_t second);
/**
* Clears the values of all the time fields, making them both unset and assigning
* them a value of zero. The field values will be determined during the next
* resolving of time into time fields.
* @stable
*/
void clear(void);
/**
* Clears the value in the given time field, both making it unset and assigning it a
* value of zero. This field value will be determined during the next resolving of
* time into time fields.
*
* @param field The time field to be cleared.
* @stable
*/
void clear(EDateFields field);
/**
* Returns a unique class ID POLYMORPHICALLY. Pure virtual method. 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.
* * Concrete subclasses of Calendar must implement getDynamicClassID() and also a * static method and data member: * * static UClassID getStaticClassID() { return (UClassID)&fgClassID; } * static char fgClassID; * * @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 */ virtual UClassID getDynamicClassID(void) const = 0; protected: /** * Constructs a Calendar with the default time zone as returned by * TimeZone::createInstance(), and the default locale. * * @param success Indicates the status of Calendar object construction. Returns * U_ZERO_ERROR if constructed successfully. * @stable */ Calendar(UErrorCode& success); /** * Copy constructor * @stable */ Calendar(const Calendar& source); /** * Default assignment operator * @stable */ Calendar& operator=(const Calendar& right); /** * Constructs a Calendar with the given time zone and locale. Clients are no longer * responsible for deleting the given time zone object after it's adopted. * * @param zoneToAdopt The given time zone. * @param aLocale The given locale. * @param success Indicates the status of Calendar object construction. Returns * U_ZERO_ERROR if constructed successfully. * @stable */ Calendar(TimeZone* zone, const Locale& aLocale, UErrorCode& success); /** * Constructs a Calendar with the given time zone and locale. * * @param zone The given time zone. * @param aLocale The given locale. * @param success Indicates the status of Calendar object construction. Returns * U_ZERO_ERROR if constructed successfully. * @stable */ Calendar(const TimeZone& zone, const Locale& aLocale, UErrorCode& success); /** * Converts Calendar's time field values to GMT as milliseconds. * * @param status Output param set to success/failure code on exit. If any value * previously set in the time field is invalid or restricted by * leniency, this will be set to an error status. * @stable */ virtual void computeTime(UErrorCode& status) = 0; /** * Converts GMT as milliseconds to time field values. This allows you to sync up the * time field values with a new time that is set for the calendar. This method * does NOT recompute the time first; to recompute the time, then the fields, use * the method complete(). * @stable */ virtual void computeFields(UErrorCode& status) = 0; /** * Gets this Calendar's current time as a long. * @return the current time as UTC milliseconds from the epoch. * @stable */ double getTimeInMillis(UErrorCode& status) const; /** * Sets this Calendar's current time from the given long value. * @param date the new time in UTC milliseconds from the epoch. * @stable */ void setTimeInMillis( double millis, UErrorCode& status ); /** * Recomputes the current time from currently set fields, and then fills in any * unset fields in the time field list. * * @param status Output param set to success/failure code on exit. If any value * previously set in the time field is invalid or restricted by * leniency, this will be set to an error status. * @stable */ void complete(UErrorCode& status); /** * Gets the value for a given time field. Subclasses can use this function to get * field values without forcing recomputation of time. * * @param field The given time field. * @return The value for the given time field. * @stable */ int32_t internalGet(EDateFields field) const {return fFields[field];} /** * Sets the value for a given time field. This is a fast internal method for * subclasses. It does not affect the areFieldsInSync, isTimeSet, or areAllFieldsSet * flags. * @stable */ void internalSet(EDateFields field, int32_t value); protected: /** * The flag which indicates if the current time is set in the calendar. */ UBool fIsTimeSet; /** * True if the fields are in sync with the currently set time of this Calendar. * If false, then the next attempt to get the value of a field will * force a recomputation of all fields from the current value of the time * field. *
* This should really be named areFieldsInSync, but the old name is retained * for backward compatibility. */ UBool fAreFieldsSet; /** * True if all of the fields have been set. This is initially false, and set to * true by computeFields(). */ UBool fAreAllFieldsSet; /** * Get the current time without recomputing. * @stable */ UDate internalGetTime(void) const { return fTime; } /** * Set the current time without affecting flags or fields. * @stable */ void internalSetTime(UDate time) { fTime = time; } /** * The time fields containing values into which the millis is computed. */ int32_t fFields[FIELD_COUNT]; /** * The flags which tell if a specified time field for the calendar is set. */ UBool fIsSet[FIELD_COUNT]; // Special values of stamp[] enum { kUnset = 0, kInternallySet, kMinimumUserStamp }; /** * Pseudo-time-stamps which specify when each field was set. There * are two special values, UNSET and INTERNALLY_SET. Values from * MINIMUM_USER_SET to Integer.MAX_VALUE are legal user set values. */ int32_t fStamp[FIELD_COUNT]; private: // The next available value for stampp[] int32_t fNextStamp;// = MINIMUM_USER_STAMP; /** * The current time set for the calendar. */ UDate fTime; /** * @see #setLenient */ UBool fLenient; /** * Time zone affects the time calculation done by Calendar. Calendar subclasses use * the time zone data to produce the local time. */ TimeZone* fZone; /** * Both firstDayOfWeek and minimalDaysInFirstWeek are locale-dependent. They are * used to figure out the week count for a specific date for a given locale. These * must be set when a Calendar is constructed. For example, in US locale, * firstDayOfWeek is SUNDAY; minimalDaysInFirstWeek is 1. They are used to figure * out the week count for a specific date for a given locale. These must be set when * a Calendar is constructed. */ EDaysOfWeek fFirstDayOfWeek; uint8_t fMinimalDaysInFirstWeek; /** * Sets firstDayOfWeek and minimalDaysInFirstWeek. Called at Calendar construction * time. * * @param desiredLocale The given locale. * @param success Indicates the status of setting the week count data from * the resource for the given locale. Returns U_ZERO_ERROR if * constructed successfully. */ void setWeekCountData(const Locale& desiredLocale, UErrorCode& success); /** * Recompute the time and update the status fields isTimeSet * and areFieldsSet. Callers should check isTimeSet and only * call this method if isTimeSet is false. */ void updateTime(UErrorCode& status); /** * Convert a UnicodeString to a long integer, using the standard C library. Return * both the value obtained, and a UErrorCode indicating success or failure. We fail * if the string is zero length, of if strtol() does not parse all of the characters * in the string, or if the value is not in the range 1..7. */ static int32_t stringToDayNumber(const UnicodeString& string, UErrorCode& status); /** * The resource tag for the resource where the week-count data is stored. */ static const char* kDateTimeElements; }; // ------------------------------------- inline Calendar* Calendar::createInstance(TimeZone* zone, UErrorCode& errorCode) { // since the Locale isn't specified, use the default locale return createInstance(zone, Locale::getDefault(), errorCode); } // ------------------------------------- inline void Calendar::roll(EDateFields field, UBool up, UErrorCode& status) { roll(field, (int32_t)(up ? +1 : -1), status); } // ------------------------------------- /** * Fast method for subclasses. The caller must maintain fUserSetDSTOffset and * fUserSetZoneOffset, as well as the isSet[] array. */ inline void Calendar::internalSet(EDateFields field, int32_t value) { fFields[field] = value; } #endif // _CALENDAR