UDate object
* and a set of integer fields such as UCAL_YEAR, UCAL_MONTH,
* UCAL_DAY, UCAL_HOUR, and so on.
* (A UDate object represents a specific instant in
* time with millisecond precision. See UDate
* for information about the UDate .)
*
*
* Types of UCalendar interpret a UDate
* according to the rules of a specific calendar system. The U_STABLE
* provides the enum UCalendarType with UCAL_TRADITIONAL and
* UCAL_GREGORIAN.
*
* Like other locale-sensitive C API, calendar API provides a
* function, ucal_open(), which returns a pointer to
* UCalendar whose time fields have been initialized
* with the current date and time. We need to specify the type of
* calendar to be opened and the timezoneId.
* \htmlonly
\endhtmlonly
*
* \code
* UCalendar *caldef;
* UChar *tzId;
* UErrorCode status;
* tzId=(UChar*)malloc(sizeof(UChar) * (strlen("PST") +1) );
* u_uastrcpy(tzId, "PST");
* caldef=ucal_open(tzID, u_strlen(tzID), NULL, UCAL_TRADITIONAL, &status);
* \endcode
*
* \htmlonly\endhtmlonly
*
*
* A UCalendar 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., UCAL_YEAR = 1970, UCAL_MONTH = JANUARY, UCAL_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. * * \htmlonly
\endhtmlonly *\endhtmlonly * * For the time of day: * * \htmlonly* \code * UCAL_MONTH + UCAL_DAY_OF_MONTH * UCAL_MONTH + UCAL_WEEK_OF_MONTH + UCAL_DAY_OF_WEEK * UCAL_MONTH + UCAL_DAY_OF_WEEK_IN_MONTH + UCAL_DAY_OF_WEEK * UCAL_DAY_OF_YEAR * UCAL_DAY_OF_WEEK + UCAL_WEEK_OF_YEAR * \endcode ** \htmlonly
\endhtmlonly *\endhtmlonly * ** \code * UCAL_HOUR_OF_DAY * UCAL_AM_PM + UCAL_HOUR * \endcode ** \htmlonly
* 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 icu::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.
*
* @stable ICU 2.0
*/
/**
* The time zone ID reserved for unknown time zone.
* @stable ICU 4.8
*/
#define UCAL_UNKNOWN_ZONE_ID "Etc/Unknown"
/** A calendar.
* For usage in C programs.
* @stable ICU 2.0
*/
typedef void* UCalendar;
/** Possible types of UCalendars
* @stable ICU 2.0
*/
enum UCalendarType {
/**
* Despite the name, UCAL_TRADITIONAL designates the locale's default calendar,
* which may be the Gregorian calendar or some other calendar.
* @stable ICU 2.0
*/
UCAL_TRADITIONAL,
/**
* A better name for UCAL_TRADITIONAL.
* @stable ICU 4.2
*/
UCAL_DEFAULT = UCAL_TRADITIONAL,
/**
* Unambiguously designates the Gregorian calendar for the locale.
* @stable ICU 2.0
*/
UCAL_GREGORIAN
};
/** @stable ICU 2.0 */
typedef enum UCalendarType UCalendarType;
/** Possible fields in a UCalendar
* @stable ICU 2.0
*/
enum UCalendarDateFields {
/**
* Field number indicating the era, e.g., AD or BC in the Gregorian (Julian) calendar.
* This is a calendar-specific value.
* @stable ICU 2.6
*/
UCAL_ERA,
/**
* Field number indicating the year. This is a calendar-specific value.
* @stable ICU 2.6
*/
UCAL_YEAR,
/**
* Field number indicating the month. This is a calendar-specific value.
* The first month of the year is
* JANUARY; the last depends on the number of months in a year.
* @see #UCAL_JANUARY
* @see #UCAL_FEBRUARY
* @see #UCAL_MARCH
* @see #UCAL_APRIL
* @see #UCAL_MAY
* @see #UCAL_JUNE
* @see #UCAL_JULY
* @see #UCAL_AUGUST
* @see #UCAL_SEPTEMBER
* @see #UCAL_OCTOBER
* @see #UCAL_NOVEMBER
* @see #UCAL_DECEMBER
* @see #UCAL_UNDECIMBER
* @stable ICU 2.6
*/
UCAL_MONTH,
/**
* Field number indicating the
* week number within the current year. The first week of the year, as
* defined by UCAL_FIRST_DAY_OF_WEEK and UCAL_MINIMAL_DAYS_IN_FIRST_WEEK
* attributes, has value 1. Subclasses define
* the value of UCAL_WEEK_OF_YEAR for days before the first week of
* the year.
* @see ucal_getAttribute
* @see ucal_setAttribute
* @stable ICU 2.6
*/
UCAL_WEEK_OF_YEAR,
/**
* Field number indicating the
* week number within the current month. The first week of the month, as
* defined by UCAL_FIRST_DAY_OF_WEEK and UCAL_MINIMAL_DAYS_IN_FIRST_WEEK
* attributes, has value 1. Subclasses define
* the value of WEEK_OF_MONTH for days before the first week of
* the month.
* @see ucal_getAttribute
* @see ucal_setAttribute
* @see #UCAL_FIRST_DAY_OF_WEEK
* @see #UCAL_MINIMAL_DAYS_IN_FIRST_WEEK
* @stable ICU 2.6
*/
UCAL_WEEK_OF_MONTH,
/**
* Field number indicating the
* day of the month. This is a synonym for DAY_OF_MONTH.
* The first day of the month has value 1.
* @see #UCAL_DAY_OF_MONTH
* @stable ICU 2.6
*/
UCAL_DATE,
/**
* Field number indicating the day
* number within the current year. The first day of the year has value 1.
* @stable ICU 2.6
*/
UCAL_DAY_OF_YEAR,
/**
* Field number indicating the day
* of the week. This field takes values SUNDAY,
* MONDAY, TUESDAY, WEDNESDAY,
* THURSDAY, FRIDAY, and SATURDAY.
* @see #UCAL_SUNDAY
* @see #UCAL_MONDAY
* @see #UCAL_TUESDAY
* @see #UCAL_WEDNESDAY
* @see #UCAL_THURSDAY
* @see #UCAL_FRIDAY
* @see #UCAL_SATURDAY
* @stable ICU 2.6
*/
UCAL_DAY_OF_WEEK,
/**
* Field number indicating the
* ordinal number of the day of the week within the current month. Together
* with the DAY_OF_WEEK field, this uniquely specifies a day
* within a month. Unlike WEEK_OF_MONTH and
* WEEK_OF_YEAR, this field's value does not depend on
* getFirstDayOfWeek() or
* getMinimalDaysInFirstWeek(). DAY_OF_MONTH 1
* through 7 always correspond to DAY_OF_WEEK_IN_MONTH
* 1; 8 through 15 correspond to
* DAY_OF_WEEK_IN_MONTH 2, and so on.
* DAY_OF_WEEK_IN_MONTH 0 indicates the week before
* DAY_OF_WEEK_IN_MONTH 1. Negative values count back from the
* end of the month, so the last Sunday of a month is specified as
* DAY_OF_WEEK = SUNDAY, DAY_OF_WEEK_IN_MONTH = -1. Because
* negative values count backward they will usually be aligned differently
* within the month than positive values. For example, if a month has 31
* days, DAY_OF_WEEK_IN_MONTH -1 will overlap
* DAY_OF_WEEK_IN_MONTH 5 and the end of 4.
* @see #UCAL_DAY_OF_WEEK
* @see #UCAL_WEEK_OF_MONTH
* @stable ICU 2.6
*/
UCAL_DAY_OF_WEEK_IN_MONTH,
/**
* Field number indicating
* whether the HOUR is before or after noon.
* E.g., at 10:04:15.250 PM the AM_PM is PM.
* @see #UCAL_AM
* @see #UCAL_PM
* @see #UCAL_HOUR
* @stable ICU 2.6
*/
UCAL_AM_PM,
/**
* Field number indicating the
* hour of the morning or afternoon. HOUR is used for the 12-hour
* clock.
* E.g., at 10:04:15.250 PM the HOUR is 10.
* @see #UCAL_AM_PM
* @see #UCAL_HOUR_OF_DAY
* @stable ICU 2.6
*/
UCAL_HOUR,
/**
* Field number indicating the
* hour of the day. HOUR_OF_DAY is used for the 24-hour clock.
* E.g., at 10:04:15.250 PM the HOUR_OF_DAY is 22.
* @see #UCAL_HOUR
* @stable ICU 2.6
*/
UCAL_HOUR_OF_DAY,
/**
* Field number indicating the
* minute within the hour.
* E.g., at 10:04:15.250 PM the UCAL_MINUTE is 4.
* @stable ICU 2.6
*/
UCAL_MINUTE,
/**
* Field number indicating the
* second within the minute.
* E.g., at 10:04:15.250 PM the UCAL_SECOND is 15.
* @stable ICU 2.6
*/
UCAL_SECOND,
/**
* Field number indicating the
* millisecond within the second.
* E.g., at 10:04:15.250 PM the UCAL_MILLISECOND is 250.
* @stable ICU 2.6
*/
UCAL_MILLISECOND,
/**
* Field number indicating the
* raw offset from GMT in milliseconds.
* @stable ICU 2.6
*/
UCAL_ZONE_OFFSET,
/**
* Field number indicating the
* daylight savings offset in milliseconds.
* @stable ICU 2.6
*/
UCAL_DST_OFFSET,
/**
* Field number
* indicating the extended year corresponding to the
* UCAL_WEEK_OF_YEAR field. This may be one greater or less
* than the value of UCAL_EXTENDED_YEAR.
* @stable ICU 2.6
*/
UCAL_YEAR_WOY,
/**
* Field number
* indicating the localized day of week. This will be a value from 1
* to 7 inclusive, with 1 being the localized first day of the week.
* @stable ICU 2.6
*/
UCAL_DOW_LOCAL,
/**
* Year of this calendar system, encompassing all supra-year fields. For example,
* in Gregorian/Julian calendars, positive Extended Year values indicate years AD,
* 1 BC = 0 extended, 2 BC = -1 extended, and so on.
* @stable ICU 2.8
*/
UCAL_EXTENDED_YEAR,
/**
* Field number
* indicating the modified Julian day number. This is different from
* the conventional Julian day number in two regards. First, it
* demarcates days at local zone midnight, rather than noon GMT.
* Second, it is a local number; that is, it depends on the local time
* zone. It can be thought of as a single number that encompasses all
* the date-related fields.
* @stable ICU 2.8
*/
UCAL_JULIAN_DAY,
/**
* Ranges from 0 to 23:59:59.999 (regardless of DST). This field behaves exactly
* like a composite of all time-related fields, not including the zone fields. As such,
* it also reflects discontinuities of those fields on DST transition days. On a day
* of DST onset, it will jump forward. On a day of DST cessation, it will jump
* backward. This reflects the fact that it must be combined with the DST_OFFSET field
* to obtain a unique local time value.
* @stable ICU 2.8
*/
UCAL_MILLISECONDS_IN_DAY,
/**
* Whether or not the current month is a leap month (0 or 1). See the Chinese calendar for
* an example of this.
*/
UCAL_IS_LEAP_MONTH,
/**
* Field count
* @stable ICU 2.6
*/
UCAL_FIELD_COUNT,
/**
* Field number indicating the
* day of the month. This is a synonym for UCAL_DATE.
* The first day of the month has value 1.
* @see #UCAL_DATE
* Synonym for UCAL_DATE
* @stable ICU 2.8
**/
UCAL_DAY_OF_MONTH=UCAL_DATE
};
/** @stable ICU 2.0 */
typedef enum UCalendarDateFields UCalendarDateFields;
/**
* 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., UCAL_SUNDAY.
*/
/** Possible days of the week in a UCalendar
* @stable ICU 2.0
*/
enum UCalendarDaysOfWeek {
/** Sunday */
UCAL_SUNDAY = 1,
/** Monday */
UCAL_MONDAY,
/** Tuesday */
UCAL_TUESDAY,
/** Wednesday */
UCAL_WEDNESDAY,
/** Thursday */
UCAL_THURSDAY,
/** Friday */
UCAL_FRIDAY,
/** Saturday */
UCAL_SATURDAY
};
/** @stable ICU 2.0 */
typedef enum UCalendarDaysOfWeek UCalendarDaysOfWeek;
/** Possible months in a UCalendar. Note: Calendar month is 0-based.
* @stable ICU 2.0
*/
enum UCalendarMonths {
/** January */
UCAL_JANUARY,
/** February */
UCAL_FEBRUARY,
/** March */
UCAL_MARCH,
/** April */
UCAL_APRIL,
/** May */
UCAL_MAY,
/** June */
UCAL_JUNE,
/** July */
UCAL_JULY,
/** August */
UCAL_AUGUST,
/** September */
UCAL_SEPTEMBER,
/** October */
UCAL_OCTOBER,
/** November */
UCAL_NOVEMBER,
/** December */
UCAL_DECEMBER,
/** Value of the UCAL_MONTH field indicating the
* thirteenth month of the year. Although the Gregorian calendar
* does not use this value, lunar calendars do.
*/
UCAL_UNDECIMBER
};
/** @stable ICU 2.0 */
typedef enum UCalendarMonths UCalendarMonths;
/** Possible AM/PM values in a UCalendar
* @stable ICU 2.0
*/
enum UCalendarAMPMs {
/** AM */
UCAL_AM,
/** PM */
UCAL_PM
};
/** @stable ICU 2.0 */
typedef enum UCalendarAMPMs UCalendarAMPMs;
/**
* System time zone type constants used by filtering zones
* in ucal_openTimeZoneIDEnumeration.
* @see ucal_openTimeZoneIDEnumeration
* @stable ICU 4.8
*/
enum USystemTimeZoneType {
/**
* Any system zones.
* @stable ICU 4.8
*/
UCAL_ZONE_TYPE_ANY,
/**
* Canonical system zones.
* @stable ICU 4.8
*/
UCAL_ZONE_TYPE_CANONICAL,
/**
* Canonical system zones associated with actual locations.
* @stable ICU 4.8
*/
UCAL_ZONE_TYPE_CANONICAL_LOCATION
};
/** @stable ICU 4.8 */
typedef enum USystemTimeZoneType USystemTimeZoneType;
/**
* Create an enumeration over system time zone IDs with the given
* filter conditions.
* @param zoneType The system time zone type.
* @param region The ISO 3166 two-letter country code or UN M.49
* three-digit area code. When NULL, no filtering
* done by region.
* @param rawOffset An offset from GMT in milliseconds, ignoring the
* effect of daylight savings time, if any. When NULL,
* no filtering done by zone offset.
* @param ec A pointer to an UErrorCode to receive any errors
* @return an enumeration object that the caller must dispose of
* using enum_close(), or NULL upon failure. In case of failure,
* *ec will indicate the error.
* @stable ICU 4.8
*/
U_STABLE UEnumeration* U_EXPORT2
ucal_openTimeZoneIDEnumeration(USystemTimeZoneType zoneType, const char* region,
const int32_t* rawOffset, UErrorCode* ec);
/**
* Create an enumeration over all time zones.
*
* @param ec input/output error code
*
* @return an enumeration object that the caller must dispose of using
* uenum_close(), or NULL upon failure. In case of failure *ec will
* indicate the error.
*
* @stable ICU 2.6
*/
U_STABLE UEnumeration* U_EXPORT2
ucal_openTimeZones(UErrorCode* ec);
/**
* Create an enumeration over all time zones associated with the given
* country. Some zones are affiliated with no country (e.g., "UTC");
* these may also be retrieved, as a group.
*
* @param country the ISO 3166 two-letter country code, or NULL to
* retrieve zones not affiliated with any country
*
* @param ec input/output error code
*
* @return an enumeration object that the caller must dispose of using
* uenum_close(), or NULL upon failure. In case of failure *ec will
* indicate the error.
*
* @stable ICU 2.6
*/
U_STABLE UEnumeration* U_EXPORT2
ucal_openCountryTimeZones(const char* country, UErrorCode* ec);
/**
* Return the default time zone. The default is determined initially
* by querying the host operating system. It may be changed with
* ucal_setDefaultTimeZone() or with the C++ TimeZone API.
*
* @param result A buffer to receive the result, or NULL
*
* @param resultCapacity The capacity of the result buffer
*
* @param ec input/output error code
*
* @return The result string length, not including the terminating
* null
*
* @stable ICU 2.6
*/
U_STABLE int32_t U_EXPORT2
ucal_getDefaultTimeZone(UChar* result, int32_t resultCapacity, UErrorCode* ec);
/**
* Set the default time zone.
*
* @param zoneID null-terminated time zone ID
*
* @param ec input/output error code
*
* @stable ICU 2.6
*/
U_STABLE void U_EXPORT2
ucal_setDefaultTimeZone(const UChar* zoneID, UErrorCode* ec);
/**
* Return the amount of time in milliseconds that the clock is
* advanced during daylight savings time for the given time zone, or
* zero if the time zone does not observe daylight savings time.
*
* @param zoneID null-terminated time zone ID
*
* @param ec input/output error code
*
* @return the number of milliseconds the time is advanced with
* respect to standard time when the daylight savings rules are in
* effect. This is always a non-negative number, most commonly either
* 3,600,000 (one hour) or zero.
*
* @stable ICU 2.6
*/
U_STABLE int32_t U_EXPORT2
ucal_getDSTSavings(const UChar* zoneID, UErrorCode* ec);
/**
* Get the current date and time.
* The value returned is represented as milliseconds from the epoch.
* @return The current date and time.
* @stable ICU 2.0
*/
U_STABLE UDate U_EXPORT2
ucal_getNow(void);
/**
* Open a UCalendar.
* A UCalendar may be used to convert a millisecond value to a year,
* month, and day.
*
* Note: When unknown TimeZone ID is specified or if the TimeZone ID specified is "Etc/Unknown",
* the UCalendar returned by the function is initialized with GMT zone with TimeZone ID
* UCAL_UNKNOWN_ZONE_ID ("Etc/Unknown") without any errors/warnings. If you want
* to check if a TimeZone ID is valid prior to this function, use ucal_getCanonicalTimeZoneID.
*
* @param zoneID The desired TimeZone ID. If 0, use the default time zone.
* @param len The length of zoneID, or -1 if null-terminated.
* @param locale The desired locale
* @param type The type of UCalendar to open. This can be UCAL_GREGORIAN to open the Gregorian
* calendar for the locale, or UCAL_DEFAULT to open the default calendar for the locale (the
* default calendar may also be Gregorian). To open a specific non-Gregorian calendar for the
* locale, use uloc_setKeywordValue to set the value of the calendar keyword for the locale
* and then pass the locale to ucal_open with UCAL_DEFAULT as the type.
* @param status A pointer to an UErrorCode to receive any errors
* @return A pointer to a UCalendar, or 0 if an error occurred.
* @see #UCAL_UNKNOWN_ZONE_ID
* @stable ICU 2.0
*/
U_STABLE UCalendar* U_EXPORT2
ucal_open(const UChar* zoneID,
int32_t len,
const char* locale,
UCalendarType type,
UErrorCode* status);
/**
* Close a UCalendar.
* Once closed, a UCalendar may no longer be used.
* @param cal The UCalendar to close.
* @stable ICU 2.0
*/
U_STABLE void U_EXPORT2
ucal_close(UCalendar *cal);
#if U_SHOW_CPLUSPLUS_API
U_NAMESPACE_BEGIN
/**
* \class LocalUCalendarPointer
* "Smart pointer" class, closes a UCalendar via ucal_close().
* For most methods see the LocalPointerBase base class.
*
* @see LocalPointerBase
* @see LocalPointer
* @stable ICU 4.4
*/
U_DEFINE_LOCAL_OPEN_POINTER(LocalUCalendarPointer, UCalendar, ucal_close);
U_NAMESPACE_END
#endif
/**
* Open a copy of a UCalendar.
* This function performs a deep copy.
* @param cal The calendar to copy
* @param status A pointer to an UErrorCode to receive any errors.
* @return A pointer to a UCalendar identical to cal.
* @stable ICU 4.0
*/
U_STABLE UCalendar* U_EXPORT2
ucal_clone(const UCalendar* cal,
UErrorCode* status);
/**
* Set the TimeZone used by a UCalendar.
* A UCalendar uses a timezone for converting from Greenwich time to local time.
* @param cal The UCalendar to set.
* @param zoneID The desired TimeZone ID. If 0, use the default time zone.
* @param len The length of zoneID, or -1 if null-terminated.
* @param status A pointer to an UErrorCode to receive any errors.
* @stable ICU 2.0
*/
U_STABLE void U_EXPORT2
ucal_setTimeZone(UCalendar* cal,
const UChar* zoneID,
int32_t len,
UErrorCode* status);
/**
* Get the ID of the UCalendar's time zone.
*
* @param cal The UCalendar to query.
* @param result Receives the UCalendar's time zone ID.
* @param resultLength The maximum size of result.
* @param status Receives the status.
* @return The total buffer size needed; if greater than resultLength, the output was truncated.
* @stable ICU 51
*/
U_STABLE int32_t U_EXPORT2
ucal_getTimeZoneID(const UCalendar *cal,
UChar *result,
int32_t resultLength,
UErrorCode *status);
/**
* Possible formats for a UCalendar's display name
* @stable ICU 2.0
*/
enum UCalendarDisplayNameType {
/** Standard display name */
UCAL_STANDARD,
/** Short standard display name */
UCAL_SHORT_STANDARD,
/** Daylight savings display name */
UCAL_DST,
/** Short daylight savings display name */
UCAL_SHORT_DST
};
/** @stable ICU 2.0 */
typedef enum UCalendarDisplayNameType UCalendarDisplayNameType;
/**
* Get the display name for a UCalendar's TimeZone.
* A display name is suitable for presentation to a user.
* @param cal The UCalendar to query.
* @param type The desired display name format; one of UCAL_STANDARD, UCAL_SHORT_STANDARD,
* UCAL_DST, UCAL_SHORT_DST
* @param locale The desired locale for the display name.
* @param result A pointer to a buffer to receive the formatted number.
* @param resultLength The maximum size of result.
* @param status A pointer to an UErrorCode to receive any errors
* @return The total buffer size needed; if greater than resultLength, the output was truncated.
* @stable ICU 2.0
*/
U_STABLE int32_t U_EXPORT2
ucal_getTimeZoneDisplayName(const UCalendar* cal,
UCalendarDisplayNameType type,
const char* locale,
UChar* result,
int32_t resultLength,
UErrorCode* status);
/**
* Determine if a UCalendar is currently in daylight savings time.
* Daylight savings time is not used in all parts of the world.
* @param cal The UCalendar to query.
* @param status A pointer to an UErrorCode to receive any errors
* @return TRUE if cal is currently in daylight savings time, FALSE otherwise
* @stable ICU 2.0
*/
U_STABLE UBool U_EXPORT2
ucal_inDaylightTime(const UCalendar* cal,
UErrorCode* status );
/**
* Sets the GregorianCalendar change date. This is the point when the switch from
* Julian dates to Gregorian dates occurred. Default is 00:00:00 local time, October
* 15, 1582. Previous to this time and date will be Julian dates.
*
* This function works only for Gregorian calendars. If the UCalendar is not
* an instance of a Gregorian calendar, then a U_UNSUPPORTED_ERROR
* error code is set.
*
* @param cal The calendar object.
* @param date The given Gregorian cutover date.
* @param pErrorCode Pointer to a standard ICU error code. Its input value must
* pass the U_SUCCESS() test, or else the function returns
* immediately. Check for U_FAILURE() on output or use with
* function chaining. (See User Guide for details.)
*
* @see GregorianCalendar::setGregorianChange
* @see ucal_getGregorianChange
* @stable ICU 3.6
*/
U_STABLE void U_EXPORT2
ucal_setGregorianChange(UCalendar *cal, UDate date, UErrorCode *pErrorCode);
/**
* Gets the Gregorian Calendar change date. This is the point when the switch from
* Julian dates to Gregorian dates occurred. Default is 00:00:00 local time, October
* 15, 1582. Previous to this time and date will be Julian dates.
*
* This function works only for Gregorian calendars. If the UCalendar is not
* an instance of a Gregorian calendar, then a U_UNSUPPORTED_ERROR
* error code is set.
*
* @param cal The calendar object.
* @param pErrorCode Pointer to a standard ICU error code. Its input value must
* pass the U_SUCCESS() test, or else the function returns
* immediately. Check for U_FAILURE() on output or use with
* function chaining. (See User Guide for details.)
* @return The Gregorian cutover time for this calendar.
*
* @see GregorianCalendar::getGregorianChange
* @see ucal_setGregorianChange
* @stable ICU 3.6
*/
U_STABLE UDate U_EXPORT2
ucal_getGregorianChange(const UCalendar *cal, UErrorCode *pErrorCode);
/**
* Types of UCalendar attributes
* @stable ICU 2.0
*/
enum UCalendarAttribute {
/**
* Lenient parsing
* @stable ICU 2.0
*/
UCAL_LENIENT,
/**
* First day of week
* @stable ICU 2.0
*/
UCAL_FIRST_DAY_OF_WEEK,
/**
* Minimum number of days in first week
* @stable ICU 2.0
*/
UCAL_MINIMAL_DAYS_IN_FIRST_WEEK,
/**
* The behavior for handling wall time repeating multiple times
* at negative time zone offset transitions
* @stable ICU 49
*/
UCAL_REPEATED_WALL_TIME,
/**
* The behavior for handling skipped wall time at positive time
* zone offset transitions.
* @stable ICU 49
*/
UCAL_SKIPPED_WALL_TIME
};
/** @stable ICU 2.0 */
typedef enum UCalendarAttribute UCalendarAttribute;
/**
* Options for handling ambiguous wall time at time zone
* offset transitions.
* @stable ICU 49
*/
enum UCalendarWallTimeOption {
/**
* An ambiguous wall time to be interpreted as the latest.
* This option is valid for UCAL_REPEATED_WALL_TIME and
* UCAL_SKIPPED_WALL_TIME.
* @stable ICU 49
*/
UCAL_WALLTIME_LAST,
/**
* An ambiguous wall time to be interpreted as the earliest.
* This option is valid for UCAL_REPEATED_WALL_TIME and
* UCAL_SKIPPED_WALL_TIME.
* @stable ICU 49
*/
UCAL_WALLTIME_FIRST,
/**
* An ambiguous wall time to be interpreted as the next valid
* wall time. This option is valid for UCAL_SKIPPED_WALL_TIME.
* @stable ICU 49
*/
UCAL_WALLTIME_NEXT_VALID
};
/** @stable ICU 49 */
typedef enum UCalendarWallTimeOption UCalendarWallTimeOption;
/**
* Get a numeric attribute associated with a UCalendar.
* Numeric attributes include the first day of the week, or the minimal numbers
* of days in the first week of the month.
* @param cal The UCalendar to query.
* @param attr The desired attribute; one of UCAL_LENIENT, UCAL_FIRST_DAY_OF_WEEK,
* UCAL_MINIMAL_DAYS_IN_FIRST_WEEK, UCAL_REPEATED_WALL_TIME or UCAL_SKIPPED_WALL_TIME
* @return The value of attr.
* @see ucal_setAttribute
* @stable ICU 2.0
*/
U_STABLE int32_t U_EXPORT2
ucal_getAttribute(const UCalendar* cal,
UCalendarAttribute attr);
/**
* Set a numeric attribute associated with a UCalendar.
* Numeric attributes include the first day of the week, or the minimal numbers
* of days in the first week of the month.
* @param cal The UCalendar to set.
* @param attr The desired attribute; one of UCAL_LENIENT, UCAL_FIRST_DAY_OF_WEEK,
* UCAL_MINIMAL_DAYS_IN_FIRST_WEEK, UCAL_REPEATED_WALL_TIME or UCAL_SKIPPED_WALL_TIME
* @param newValue The new value of attr.
* @see ucal_getAttribute
* @stable ICU 2.0
*/
U_STABLE void U_EXPORT2
ucal_setAttribute(UCalendar* cal,
UCalendarAttribute attr,
int32_t newValue);
/**
* Get a locale for which calendars are available.
* A UCalendar in a locale returned by this function will contain the correct
* day and month names for the locale.
* @param localeIndex The index of the desired locale.
* @return A locale for which calendars are available, or 0 if none.
* @see ucal_countAvailable
* @stable ICU 2.0
*/
U_STABLE const char* U_EXPORT2
ucal_getAvailable(int32_t localeIndex);
/**
* Determine how many locales have calendars available.
* This function is most useful as determining the loop ending condition for
* calls to \ref ucal_getAvailable.
* @return The number of locales for which calendars are available.
* @see ucal_getAvailable
* @stable ICU 2.0
*/
U_STABLE int32_t U_EXPORT2
ucal_countAvailable(void);
/**
* Get a UCalendar's current time in millis.
* The time is represented as milliseconds from the epoch.
* @param cal The UCalendar to query.
* @param status A pointer to an UErrorCode to receive any errors
* @return The calendar's current time in millis.
* @see ucal_setMillis
* @see ucal_setDate
* @see ucal_setDateTime
* @stable ICU 2.0
*/
U_STABLE UDate U_EXPORT2
ucal_getMillis(const UCalendar* cal,
UErrorCode* status);
/**
* Set a UCalendar's current time in millis.
* The time is represented as milliseconds from the epoch.
* @param cal The UCalendar to set.
* @param dateTime The desired date and time.
* @param status A pointer to an UErrorCode to receive any errors
* @see ucal_getMillis
* @see ucal_setDate
* @see ucal_setDateTime
* @stable ICU 2.0
*/
U_STABLE void U_EXPORT2
ucal_setMillis(UCalendar* cal,
UDate dateTime,
UErrorCode* status );
/**
* Set a UCalendar's current date.
* The date is represented as a series of 32-bit integers.
* @param cal The UCalendar to set.
* @param year The desired year.
* @param month The desired month; one of UCAL_JANUARY, UCAL_FEBRUARY, UCAL_MARCH, UCAL_APRIL, UCAL_MAY,
* UCAL_JUNE, UCAL_JULY, UCAL_AUGUST, UCAL_SEPTEMBER, UCAL_OCTOBER, UCAL_NOVEMBER, UCAL_DECEMBER, UCAL_UNDECIMBER
* @param date The desired day of the month.
* @param status A pointer to an UErrorCode to receive any errors
* @see ucal_getMillis
* @see ucal_setMillis
* @see ucal_setDateTime
* @stable ICU 2.0
*/
U_STABLE void U_EXPORT2
ucal_setDate(UCalendar* cal,
int32_t year,
int32_t month,
int32_t date,
UErrorCode* status);
/**
* Set a UCalendar's current date.
* The date is represented as a series of 32-bit integers.
* @param cal The UCalendar to set.
* @param year The desired year.
* @param month The desired month; one of UCAL_JANUARY, UCAL_FEBRUARY, UCAL_MARCH, UCAL_APRIL, UCAL_MAY,
* UCAL_JUNE, UCAL_JULY, UCAL_AUGUST, UCAL_SEPTEMBER, UCAL_OCTOBER, UCAL_NOVEMBER, UCAL_DECEMBER, UCAL_UNDECIMBER
* @param date The desired day of the month.
* @param hour The desired hour of day.
* @param minute The desired minute.
* @param second The desirec second.
* @param status A pointer to an UErrorCode to receive any errors
* @see ucal_getMillis
* @see ucal_setMillis
* @see ucal_setDate
* @stable ICU 2.0
*/
U_STABLE void U_EXPORT2
ucal_setDateTime(UCalendar* cal,
int32_t year,
int32_t month,
int32_t date,
int32_t hour,
int32_t minute,
int32_t second,
UErrorCode* status);
/**
* Returns TRUE if two UCalendars are equivalent. Equivalent
* UCalendars will behave identically, but they may be set to
* different times.
* @param cal1 The first of the UCalendars to compare.
* @param cal2 The second of the UCalendars to compare.
* @return TRUE if cal1 and cal2 are equivalent, FALSE otherwise.
* @stable ICU 2.0
*/
U_STABLE UBool U_EXPORT2
ucal_equivalentTo(const UCalendar* cal1,
const UCalendar* cal2);
/**
* Add a specified signed amount to a particular field in a UCalendar.
* This can modify more significant fields in the calendar.
* Adding a positive value always means moving forward in time, so for the Gregorian calendar,
* starting with 100 BC and adding +1 to year results in 99 BC (even though this actually reduces
* the numeric value of the field itself).
* @param cal The UCalendar to which to add.
* @param field The field to which to add the signed value; one of UCAL_ERA, UCAL_YEAR, UCAL_MONTH,
* UCAL_WEEK_OF_YEAR, UCAL_WEEK_OF_MONTH, UCAL_DATE, UCAL_DAY_OF_YEAR, UCAL_DAY_OF_WEEK,
* UCAL_DAY_OF_WEEK_IN_MONTH, UCAL_AM_PM, UCAL_HOUR, UCAL_HOUR_OF_DAY, UCAL_MINUTE, UCAL_SECOND,
* UCAL_MILLISECOND, UCAL_ZONE_OFFSET, UCAL_DST_OFFSET.
* @param amount The signed amount to add to field. If the amount causes the value
* to exceed to maximum or minimum values for that field, other fields are modified
* to preserve the magnitude of the change.
* @param status A pointer to an UErrorCode to receive any errors
* @see ucal_roll
* @stable ICU 2.0
*/
U_STABLE void U_EXPORT2
ucal_add(UCalendar* cal,
UCalendarDateFields field,
int32_t amount,
UErrorCode* status);
/**
* Add a specified signed amount to a particular field in a UCalendar.
* This will not modify more significant fields in the calendar.
* Rolling by a positive value always means moving forward in time (unless the limit of the
* field is reached, in which case it may pin or wrap), so for Gregorian calendar,
* starting with 100 BC and rolling the year by +1 results in 99 BC.
* When eras have a definite beginning and end (as in the Chinese calendar, or as in most eras in the
* Japanese calendar) then rolling the year past either limit of the era will cause the year to wrap around.
* When eras only have a limit at one end, then attempting to roll the year past that limit will result in
* pinning the year at that limit. Note that for most calendars in which era 0 years move forward in time
* (such as Buddhist, Hebrew, or Islamic), it is possible for add or roll to result in negative years for
* era 0 (that is the only way to represent years before the calendar epoch).
* @param cal The UCalendar to which to add.
* @param field The field to which to add the signed value; one of UCAL_ERA, UCAL_YEAR, UCAL_MONTH,
* UCAL_WEEK_OF_YEAR, UCAL_WEEK_OF_MONTH, UCAL_DATE, UCAL_DAY_OF_YEAR, UCAL_DAY_OF_WEEK,
* UCAL_DAY_OF_WEEK_IN_MONTH, UCAL_AM_PM, UCAL_HOUR, UCAL_HOUR_OF_DAY, UCAL_MINUTE, UCAL_SECOND,
* UCAL_MILLISECOND, UCAL_ZONE_OFFSET, UCAL_DST_OFFSET.
* @param amount The signed amount to add to field. If the amount causes the value
* to exceed to maximum or minimum values for that field, the field is pinned to a permissible
* value.
* @param status A pointer to an UErrorCode to receive any errors
* @see ucal_add
* @stable ICU 2.0
*/
U_STABLE void U_EXPORT2
ucal_roll(UCalendar* cal,
UCalendarDateFields field,
int32_t amount,
UErrorCode* status);
/**
* Get the current value of a field from a UCalendar.
* All fields are represented as 32-bit integers.
* @param cal The UCalendar to query.
* @param field The desired field; one of UCAL_ERA, UCAL_YEAR, UCAL_MONTH,
* UCAL_WEEK_OF_YEAR, UCAL_WEEK_OF_MONTH, UCAL_DATE, UCAL_DAY_OF_YEAR, UCAL_DAY_OF_WEEK,
* UCAL_DAY_OF_WEEK_IN_MONTH, UCAL_AM_PM, UCAL_HOUR, UCAL_HOUR_OF_DAY, UCAL_MINUTE, UCAL_SECOND,
* UCAL_MILLISECOND, UCAL_ZONE_OFFSET, UCAL_DST_OFFSET.
* @param status A pointer to an UErrorCode to receive any errors
* @return The value of the desired field.
* @see ucal_set
* @see ucal_isSet
* @see ucal_clearField
* @see ucal_clear
* @stable ICU 2.0
*/
U_STABLE int32_t U_EXPORT2
ucal_get(const UCalendar* cal,
UCalendarDateFields field,
UErrorCode* status );
/**
* Set the value of a field in a UCalendar.
* All fields are represented as 32-bit integers.
* @param cal The UCalendar to set.
* @param field The field to set; one of UCAL_ERA, UCAL_YEAR, UCAL_MONTH,
* UCAL_WEEK_OF_YEAR, UCAL_WEEK_OF_MONTH, UCAL_DATE, UCAL_DAY_OF_YEAR, UCAL_DAY_OF_WEEK,
* UCAL_DAY_OF_WEEK_IN_MONTH, UCAL_AM_PM, UCAL_HOUR, UCAL_HOUR_OF_DAY, UCAL_MINUTE, UCAL_SECOND,
* UCAL_MILLISECOND, UCAL_ZONE_OFFSET, UCAL_DST_OFFSET.
* @param value The desired value of field.
* @see ucal_get
* @see ucal_isSet
* @see ucal_clearField
* @see ucal_clear
* @stable ICU 2.0
*/
U_STABLE void U_EXPORT2
ucal_set(UCalendar* cal,
UCalendarDateFields field,
int32_t value);
/**
* Determine if a field in a UCalendar is set.
* All fields are represented as 32-bit integers.
* @param cal The UCalendar to query.
* @param field The desired field; one of UCAL_ERA, UCAL_YEAR, UCAL_MONTH,
* UCAL_WEEK_OF_YEAR, UCAL_WEEK_OF_MONTH, UCAL_DATE, UCAL_DAY_OF_YEAR, UCAL_DAY_OF_WEEK,
* UCAL_DAY_OF_WEEK_IN_MONTH, UCAL_AM_PM, UCAL_HOUR, UCAL_HOUR_OF_DAY, UCAL_MINUTE, UCAL_SECOND,
* UCAL_MILLISECOND, UCAL_ZONE_OFFSET, UCAL_DST_OFFSET.
* @return TRUE if field is set, FALSE otherwise.
* @see ucal_get
* @see ucal_set
* @see ucal_clearField
* @see ucal_clear
* @stable ICU 2.0
*/
U_STABLE UBool U_EXPORT2
ucal_isSet(const UCalendar* cal,
UCalendarDateFields field);
/**
* Clear a field in a UCalendar.
* All fields are represented as 32-bit integers.
* @param cal The UCalendar containing the field to clear.
* @param field The field to clear; one of UCAL_ERA, UCAL_YEAR, UCAL_MONTH,
* UCAL_WEEK_OF_YEAR, UCAL_WEEK_OF_MONTH, UCAL_DATE, UCAL_DAY_OF_YEAR, UCAL_DAY_OF_WEEK,
* UCAL_DAY_OF_WEEK_IN_MONTH, UCAL_AM_PM, UCAL_HOUR, UCAL_HOUR_OF_DAY, UCAL_MINUTE, UCAL_SECOND,
* UCAL_MILLISECOND, UCAL_ZONE_OFFSET, UCAL_DST_OFFSET.
* @see ucal_get
* @see ucal_set
* @see ucal_isSet
* @see ucal_clear
* @stable ICU 2.0
*/
U_STABLE void U_EXPORT2
ucal_clearField(UCalendar* cal,
UCalendarDateFields field);
/**
* Clear all fields in a UCalendar.
* All fields are represented as 32-bit integers.
* @param calendar The UCalendar to clear.
* @see ucal_get
* @see ucal_set
* @see ucal_isSet
* @see ucal_clearField
* @stable ICU 2.0
*/
U_STABLE void U_EXPORT2
ucal_clear(UCalendar* calendar);
/**
* Possible limit values for a UCalendar
* @stable ICU 2.0
*/
enum UCalendarLimitType {
/** Minimum value */
UCAL_MINIMUM,
/** Maximum value */
UCAL_MAXIMUM,
/** Greatest minimum value */
UCAL_GREATEST_MINIMUM,
/** Leaest maximum value */
UCAL_LEAST_MAXIMUM,
/** Actual minimum value */
UCAL_ACTUAL_MINIMUM,
/** Actual maximum value */
UCAL_ACTUAL_MAXIMUM
};
/** @stable ICU 2.0 */
typedef enum UCalendarLimitType UCalendarLimitType;
/**
* Determine a limit for a field in a UCalendar.
* A limit is a maximum or minimum value for a field.
* @param cal The UCalendar to query.
* @param field The desired field; one of UCAL_ERA, UCAL_YEAR, UCAL_MONTH,
* UCAL_WEEK_OF_YEAR, UCAL_WEEK_OF_MONTH, UCAL_DATE, UCAL_DAY_OF_YEAR, UCAL_DAY_OF_WEEK,
* UCAL_DAY_OF_WEEK_IN_MONTH, UCAL_AM_PM, UCAL_HOUR, UCAL_HOUR_OF_DAY, UCAL_MINUTE, UCAL_SECOND,
* UCAL_MILLISECOND, UCAL_ZONE_OFFSET, UCAL_DST_OFFSET.
* @param type The desired critical point; one of UCAL_MINIMUM, UCAL_MAXIMUM, UCAL_GREATEST_MINIMUM,
* UCAL_LEAST_MAXIMUM, UCAL_ACTUAL_MINIMUM, UCAL_ACTUAL_MAXIMUM
* @param status A pointer to an UErrorCode to receive any errors.
* @return The requested value.
* @stable ICU 2.0
*/
U_STABLE int32_t U_EXPORT2
ucal_getLimit(const UCalendar* cal,
UCalendarDateFields field,
UCalendarLimitType type,
UErrorCode* status);
/** Get the locale for this calendar object. You can choose between valid and actual locale.
* @param cal The calendar object
* @param type type of the locale we're looking for (valid or actual)
* @param status error code for the operation
* @return the locale name
* @stable ICU 2.8
*/
U_STABLE const char * U_EXPORT2
ucal_getLocaleByType(const UCalendar *cal, ULocDataLocaleType type, UErrorCode* status);
/**
* Returns the timezone data version currently used by ICU.
* @param status error code for the operation
* @return the version string, such as "2007f"
* @stable ICU 3.8
*/
U_STABLE const char * U_EXPORT2
ucal_getTZDataVersion(UErrorCode* status);
/**
* Returns the canonical system timezone ID or the normalized
* custom time zone ID for the given time zone ID.
* @param id The input timezone ID to be canonicalized.
* @param len The length of id, or -1 if null-terminated.
* @param result The buffer receives the canonical system timezone ID
* or the custom timezone ID in normalized format.
* @param resultCapacity The capacity of the result buffer.
* @param isSystemID Receives if the given ID is a known system
* timezone ID.
* @param status Receives the status. When the given timezone ID
* is neither a known system time zone ID nor a
* valid custom timezone ID, U_ILLEGAL_ARGUMENT_ERROR
* is set.
* @return The result string length, not including the terminating
* null.
* @stable ICU 4.0
*/
U_STABLE int32_t U_EXPORT2
ucal_getCanonicalTimeZoneID(const UChar* id, int32_t len,
UChar* result, int32_t resultCapacity, UBool *isSystemID, UErrorCode* status);
/**
* Get the resource keyword value string designating the calendar type for the UCalendar.
* @param cal The UCalendar to query.
* @param status The error code for the operation.
* @return The resource keyword value string.
* @stable ICU 4.2
*/
U_STABLE const char * U_EXPORT2
ucal_getType(const UCalendar *cal, UErrorCode* status);
/**
* Given a key and a locale, returns an array of string values in a preferred
* order that would make a difference. These are all and only those values where
* the open (creation) of the service with the locale formed from the input locale
* plus input keyword and that value has different behavior than creation with the
* input locale alone.
* @param key one of the keys supported by this service. For now, only
* "calendar" is supported.
* @param locale the locale
* @param commonlyUsed if set to true it will return only commonly used values
* with the given locale in preferred order. Otherwise,
* it will return all the available values for the locale.
* @param status error status
* @return a string enumeration over keyword values for the given key and the locale.
* @stable ICU 4.2
*/
U_STABLE UEnumeration* U_EXPORT2
ucal_getKeywordValuesForLocale(const char* key,
const char* locale,
UBool commonlyUsed,
UErrorCode* status);
/** Weekday types, as returned by ucal_getDayOfWeekType().
* @stable ICU 4.4
*/
enum UCalendarWeekdayType {
/**
* Designates a full weekday (no part of the day is included in the weekend).
* @stable ICU 4.4
*/
UCAL_WEEKDAY,
/**
* Designates a full weekend day (the entire day is included in the weekend).
* @stable ICU 4.4
*/
UCAL_WEEKEND,
/**
* Designates a day that starts as a weekday and transitions to the weekend.
* Call ucal_getWeekendTransition() to get the time of transition.
* @stable ICU 4.4
*/
UCAL_WEEKEND_ONSET,
/**
* Designates a day that starts as the weekend and transitions to a weekday.
* Call ucal_getWeekendTransition() to get the time of transition.
* @stable ICU 4.4
*/
UCAL_WEEKEND_CEASE
};
/** @stable ICU 4.4 */
typedef enum UCalendarWeekdayType UCalendarWeekdayType;
/**
* Returns whether the given day of the week is a weekday, a weekend day,
* or a day that transitions from one to the other, for the locale and
* calendar system associated with this UCalendar (the locale's region is
* often the most determinant factor). If a transition occurs at midnight,
* then the days before and after the transition will have the
* type UCAL_WEEKDAY or UCAL_WEEKEND. If a transition occurs at a time
* other than midnight, then the day of the transition will have
* the type UCAL_WEEKEND_ONSET or UCAL_WEEKEND_CEASE. In this case, the
* function ucal_getWeekendTransition() will return the point of
* transition.
* @param cal The UCalendar to query.
* @param dayOfWeek The day of the week whose type is desired (UCAL_SUNDAY..UCAL_SATURDAY).
* @param status The error code for the operation.
* @return The UCalendarWeekdayType for the day of the week.
* @stable ICU 4.4
*/
U_STABLE UCalendarWeekdayType U_EXPORT2
ucal_getDayOfWeekType(const UCalendar *cal, UCalendarDaysOfWeek dayOfWeek, UErrorCode* status);
/**
* Returns the time during the day at which the weekend begins or ends in
* this calendar system. If ucal_getDayOfWeekType() returns UCAL_WEEKEND_ONSET
* for the specified dayOfWeek, return the time at which the weekend begins.
* If ucal_getDayOfWeekType() returns UCAL_WEEKEND_CEASE for the specified dayOfWeek,
* return the time at which the weekend ends. If ucal_getDayOfWeekType() returns
* some other UCalendarWeekdayType for the specified dayOfWeek, is it an error condition
* (U_ILLEGAL_ARGUMENT_ERROR).
* @param cal The UCalendar to query.
* @param dayOfWeek The day of the week for which the weekend transition time is
* desired (UCAL_SUNDAY..UCAL_SATURDAY).
* @param status The error code for the operation.
* @return The milliseconds after midnight at which the weekend begins or ends.
* @stable ICU 4.4
*/
U_STABLE int32_t U_EXPORT2
ucal_getWeekendTransition(const UCalendar *cal, UCalendarDaysOfWeek dayOfWeek, UErrorCode *status);
/**
* Returns TRUE if the given UDate is in the weekend in
* this calendar system.
* @param cal The UCalendar to query.
* @param date The UDate in question.
* @param status The error code for the operation.
* @return TRUE if the given UDate is in the weekend in
* this calendar system, FALSE otherwise.
* @stable ICU 4.4
*/
U_STABLE UBool U_EXPORT2
ucal_isWeekend(const UCalendar *cal, UDate date, UErrorCode *status);
/**
* Return the difference between the target time and the time this calendar object is currently set to.
* If the target time is after the current calendar setting, the the returned value will be positive.
* The field parameter specifies the units of the return value. For example, if field is UCAL_MONTH
* and ucal_getFieldDifference returns 3, then the target time is 3 to less than 4 months after the
* current calendar setting.
*
* As a side effect of this call, this calendar is advanced toward target by the given amount. That is,
* calling this function has the side effect of calling ucal_add on this calendar with the specified
* field and an amount equal to the return value from this function.
*
* A typical way of using this function is to call it first with the largest field of interest, then
* with progressively smaller fields.
*
* @param cal The UCalendar to compare and update.
* @param target The target date to compare to the current calendar setting.
* @param field The field to compare; one of UCAL_ERA, UCAL_YEAR, UCAL_MONTH,
* UCAL_WEEK_OF_YEAR, UCAL_WEEK_OF_MONTH, UCAL_DATE, UCAL_DAY_OF_YEAR, UCAL_DAY_OF_WEEK,
* UCAL_DAY_OF_WEEK_IN_MONTH, UCAL_AM_PM, UCAL_HOUR, UCAL_HOUR_OF_DAY, UCAL_MINUTE, UCAL_SECOND,
* UCAL_MILLISECOND, UCAL_ZONE_OFFSET, UCAL_DST_OFFSET.
* @param status A pointer to an UErrorCode to receive any errors
* @return The date difference for the specified field.
* @stable ICU 4.8
*/
U_STABLE int32_t U_EXPORT2
ucal_getFieldDifference(UCalendar* cal,
UDate target,
UCalendarDateFields field,
UErrorCode* status);
/**
* Time zone transition types for ucal_getTimeZoneTransitionDate
* @stable ICU 50
*/
enum UTimeZoneTransitionType {
/**
* Get the next transition after the current date,
* i.e. excludes the current date
* @stable ICU 50
*/
UCAL_TZ_TRANSITION_NEXT,
/**
* Get the next transition on or after the current date,
* i.e. may include the current date
* @stable ICU 50
*/
UCAL_TZ_TRANSITION_NEXT_INCLUSIVE,
/**
* Get the previous transition before the current date,
* i.e. excludes the current date
* @stable ICU 50
*/
UCAL_TZ_TRANSITION_PREVIOUS,
/**
* Get the previous transition on or before the current date,
* i.e. may include the current date
* @stable ICU 50
*/
UCAL_TZ_TRANSITION_PREVIOUS_INCLUSIVE
};
typedef enum UTimeZoneTransitionType UTimeZoneTransitionType; /**< @stable ICU 50 */
/**
* Get the UDate for the next/previous time zone transition relative to
* the calendar's current date, in the time zone to which the calendar
* is currently set. If there is no known time zone transition of the
* requested type relative to the calendar's date, the function returns
* FALSE.
* @param cal The UCalendar to query.
* @param type The type of transition desired.
* @param transition A pointer to a UDate to be set to the transition time.
* If the function returns FALSE, the value set is unspecified.
* @param status A pointer to a UErrorCode to receive any errors.
* @return TRUE if a valid transition time is set in *transition, FALSE
* otherwise.
* @stable ICU 50
*/
U_STABLE UBool U_EXPORT2
ucal_getTimeZoneTransitionDate(const UCalendar* cal, UTimeZoneTransitionType type,
UDate* transition, UErrorCode* status);
/**
* Converts a system time zone ID to an equivalent Windows time zone ID. For example,
* Windows time zone ID "Pacific Standard Time" is returned for input "America/Los_Angeles".
*
*
There are system time zones that cannot be mapped to Windows zones. When the input * system time zone ID is unknown or unmappable to a Windows time zone, then this * function returns 0 as the result length, but the operation itself remains successful * (no error status set on return). * *
This implementation utilizes
* Zone-Tzid mapping data. The mapping data is updated time to time. To get the latest changes,
* please read the ICU user guide section
* Updating the Time Zone Data.
*
* @param id A system time zone ID.
* @param len The length of id, or -1 if null-terminated.
* @param winid A buffer to receive a Windows time zone ID.
* @param winidCapacity The capacity of the result buffer winid.
* @param status Receives the status.
* @return The result string length, not including the terminating null.
* @see ucal_getTimeZoneIDForWindowsID
*
* @stable ICU 52
*/
U_STABLE int32_t U_EXPORT2
ucal_getWindowsTimeZoneID(const UChar* id, int32_t len,
UChar* winid, int32_t winidCapacity, UErrorCode* status);
/**
* Converts a Windows time zone ID to an equivalent system time zone ID
* for a region. For example, system time zone ID "America/Los_Angeles" is returned
* for input Windows ID "Pacific Standard Time" and region "US" (or null),
* "America/Vancouver" is returned for the same Windows ID "Pacific Standard Time" and
* region "CA".
*
*
Not all Windows time zones can be mapped to system time zones. When the input * Windows time zone ID is unknown or unmappable to a system time zone, then this * function returns 0 as the result length, but the operation itself remains successful * (no error status set on return). * *
This implementation utilizes
* Zone-Tzid mapping data. The mapping data is updated time to time. To get the latest changes,
* please read the ICU user guide section
* Updating the Time Zone Data.
*
* @param winid A Windows time zone ID.
* @param len The length of winid, or -1 if null-terminated.
* @param region A null-terminated region code, or NULL if no regional preference.
* @param id A buffer to receive a system time zone ID.
* @param idCapacity The capacity of the result buffer id.
* @param status Receives the status.
* @return The result string length, not including the terminating null.
* @see ucal_getWindowsTimeZoneID
*
* @stable ICU 52
*/
U_STABLE int32_t U_EXPORT2
ucal_getTimeZoneIDForWindowsID(const UChar* winid, int32_t len, const char* region,
UChar* id, int32_t idCapacity, UErrorCode* status);
#endif /* #if !UCONFIG_NO_FORMATTING */
#endif