ICU 75.1 75.1
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C API: Calendar. More...
#include "unicode/utypes.h"
#include "unicode/uenum.h"
#include "unicode/uloc.h"
#include "unicode/localpointer.h"
Go to the source code of this file.
Namespaces | |
namespace | icu |
File coll.h. | |
Macros | |
#define | UCAL_UNKNOWN_ZONE_ID "Etc/Unknown" |
The time zone ID reserved for unknown time zone. | |
Typedefs | |
typedef void * | UCalendar |
A calendar. | |
typedef enum UCalendarType | UCalendarType |
typedef enum UCalendarDateFields | UCalendarDateFields |
typedef enum UCalendarDaysOfWeek | UCalendarDaysOfWeek |
typedef enum UCalendarMonths | UCalendarMonths |
typedef enum UCalendarAMPMs | UCalendarAMPMs |
typedef enum USystemTimeZoneType | USystemTimeZoneType |
typedef enum UCalendarDisplayNameType | UCalendarDisplayNameType |
typedef enum UCalendarAttribute | UCalendarAttribute |
typedef enum UCalendarWallTimeOption | UCalendarWallTimeOption |
typedef enum UCalendarLimitType | UCalendarLimitType |
typedef enum UCalendarWeekdayType | UCalendarWeekdayType |
typedef enum UTimeZoneTransitionType | UTimeZoneTransitionType |
typedef enum UTimeZoneLocalOption | UTimeZoneLocalOption |
Functions | |
U_CAPI UEnumeration * | ucal_openTimeZoneIDEnumeration (USystemTimeZoneType zoneType, const char *region, const int32_t *rawOffset, UErrorCode *ec) |
Create an enumeration over system time zone IDs with the given filter conditions. | |
U_CAPI UEnumeration * | ucal_openTimeZones (UErrorCode *ec) |
Create an enumeration over all time zones. | |
U_CAPI UEnumeration * | ucal_openCountryTimeZones (const char *country, UErrorCode *ec) |
Create an enumeration over all time zones associated with the given country. | |
U_CAPI int32_t | ucal_getDefaultTimeZone (UChar *result, int32_t resultCapacity, UErrorCode *ec) |
Return the default time zone. | |
U_CAPI void | ucal_setDefaultTimeZone (const UChar *zoneID, UErrorCode *ec) |
Set the default time zone. | |
U_CAPI int32_t | ucal_getHostTimeZone (UChar *result, int32_t resultCapacity, UErrorCode *ec) |
Return the current host time zone. | |
U_CAPI int32_t | ucal_getDSTSavings (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. | |
U_CAPI UDate | ucal_getNow (void) |
Get the current date and time. | |
U_CAPI UCalendar * | ucal_open (const UChar *zoneID, int32_t len, const char *locale, UCalendarType type, UErrorCode *status) |
Open a UCalendar. | |
U_CAPI void | ucal_close (UCalendar *cal) |
Close a UCalendar. | |
U_CAPI UCalendar * | ucal_clone (const UCalendar *cal, UErrorCode *status) |
Open a copy of a UCalendar. | |
U_CAPI void | ucal_setTimeZone (UCalendar *cal, const UChar *zoneID, int32_t len, UErrorCode *status) |
Set the TimeZone used by a UCalendar. | |
U_CAPI int32_t | ucal_getTimeZoneID (const UCalendar *cal, UChar *result, int32_t resultLength, UErrorCode *status) |
Get the ID of the UCalendar's time zone. | |
U_CAPI int32_t | ucal_getTimeZoneDisplayName (const UCalendar *cal, UCalendarDisplayNameType type, const char *locale, UChar *result, int32_t resultLength, UErrorCode *status) |
Get the display name for a UCalendar's TimeZone. | |
U_CAPI UBool | ucal_inDaylightTime (const UCalendar *cal, UErrorCode *status) |
Determine if a UCalendar is currently in daylight savings time. | |
U_CAPI void | ucal_setGregorianChange (UCalendar *cal, UDate date, UErrorCode *pErrorCode) |
Sets the GregorianCalendar change date. | |
U_CAPI UDate | ucal_getGregorianChange (const UCalendar *cal, UErrorCode *pErrorCode) |
Gets the Gregorian Calendar change date. | |
U_CAPI int32_t | ucal_getAttribute (const UCalendar *cal, UCalendarAttribute attr) |
Get a numeric attribute associated with a UCalendar. | |
U_CAPI void | ucal_setAttribute (UCalendar *cal, UCalendarAttribute attr, int32_t newValue) |
Set a numeric attribute associated with a UCalendar. | |
U_CAPI const char * | ucal_getAvailable (int32_t localeIndex) |
Get a locale for which calendars are available. | |
U_CAPI int32_t | ucal_countAvailable (void) |
Determine how many locales have calendars available. | |
U_CAPI UDate | ucal_getMillis (const UCalendar *cal, UErrorCode *status) |
Get a UCalendar's current time in millis. | |
U_CAPI void | ucal_setMillis (UCalendar *cal, UDate dateTime, UErrorCode *status) |
Set a UCalendar's current time in millis. | |
U_CAPI void | ucal_setDate (UCalendar *cal, int32_t year, int32_t month, int32_t date, UErrorCode *status) |
Set a UCalendar's current date. | |
U_CAPI void | ucal_setDateTime (UCalendar *cal, int32_t year, int32_t month, int32_t date, int32_t hour, int32_t minute, int32_t second, UErrorCode *status) |
Set a UCalendar's current date. | |
U_CAPI UBool | ucal_equivalentTo (const UCalendar *cal1, const UCalendar *cal2) |
Returns true if two UCalendars are equivalent. | |
U_CAPI void | ucal_add (UCalendar *cal, UCalendarDateFields field, int32_t amount, UErrorCode *status) |
Add a specified signed amount to a particular field in a UCalendar. | |
U_CAPI void | ucal_roll (UCalendar *cal, UCalendarDateFields field, int32_t amount, UErrorCode *status) |
Add a specified signed amount to a particular field in a UCalendar. | |
U_CAPI int32_t | ucal_get (const UCalendar *cal, UCalendarDateFields field, UErrorCode *status) |
Get the current value of a field from a UCalendar. | |
U_CAPI void | ucal_set (UCalendar *cal, UCalendarDateFields field, int32_t value) |
Set the value of a field in a UCalendar. | |
U_CAPI UBool | ucal_isSet (const UCalendar *cal, UCalendarDateFields field) |
Determine if a field in a UCalendar is set. | |
U_CAPI void | ucal_clearField (UCalendar *cal, UCalendarDateFields field) |
Clear a field in a UCalendar. | |
U_CAPI void | ucal_clear (UCalendar *calendar) |
Clear all fields in a UCalendar. | |
U_CAPI int32_t | ucal_getLimit (const UCalendar *cal, UCalendarDateFields field, UCalendarLimitType type, UErrorCode *status) |
Determine a limit for a field in a UCalendar. | |
U_CAPI const char * | ucal_getLocaleByType (const UCalendar *cal, ULocDataLocaleType type, UErrorCode *status) |
Get the locale for this calendar object. | |
U_CAPI const char * | ucal_getTZDataVersion (UErrorCode *status) |
Returns the timezone data version currently used by ICU. | |
U_CAPI int32_t | ucal_getCanonicalTimeZoneID (const UChar *id, int32_t len, UChar *result, int32_t resultCapacity, UBool *isSystemID, UErrorCode *status) |
Returns the canonical system timezone ID or the normalized custom time zone ID for the given time zone ID. | |
U_CAPI int32_t | ucal_getIanaTimeZoneID (const UChar *id, int32_t len, UChar *result, int32_t resultCapacity, UErrorCode *status) |
Returns the preferred time zone ID in the IANA time zone database for the given time zone ID. | |
U_CAPI const char * | ucal_getType (const UCalendar *cal, UErrorCode *status) |
Get the resource keyword value string designating the calendar type for the UCalendar. | |
U_CAPI UEnumeration * | ucal_getKeywordValuesForLocale (const char *key, const char *locale, UBool commonlyUsed, UErrorCode *status) |
Given a key and a locale, returns an array of string values in a preferred order that would make a difference. | |
U_CAPI UCalendarWeekdayType | ucal_getDayOfWeekType (const UCalendar *cal, UCalendarDaysOfWeek dayOfWeek, UErrorCode *status) |
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). | |
U_CAPI int32_t | ucal_getWeekendTransition (const UCalendar *cal, UCalendarDaysOfWeek dayOfWeek, UErrorCode *status) |
Returns the time during the day at which the weekend begins or ends in this calendar system. | |
U_CAPI UBool | ucal_isWeekend (const UCalendar *cal, UDate date, UErrorCode *status) |
Returns true if the given UDate is in the weekend in this calendar system. | |
U_CAPI int32_t | ucal_getFieldDifference (UCalendar *cal, UDate target, UCalendarDateFields field, UErrorCode *status) |
Return the difference between the target time and the time this calendar object is currently set to. | |
U_CAPI UBool | ucal_getTimeZoneTransitionDate (const UCalendar *cal, UTimeZoneTransitionType type, UDate *transition, UErrorCode *status) |
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. | |
U_CAPI int32_t | ucal_getWindowsTimeZoneID (const UChar *id, int32_t len, UChar *winid, int32_t winidCapacity, UErrorCode *status) |
Converts a system time zone ID to an equivalent Windows time zone ID. | |
U_CAPI int32_t | ucal_getTimeZoneIDForWindowsID (const UChar *winid, int32_t len, const char *region, UChar *id, int32_t idCapacity, UErrorCode *status) |
Converts a Windows time zone ID to an equivalent system time zone ID for a region. | |
U_CAPI void | ucal_getTimeZoneOffsetFromLocal (const UCalendar *cal, UTimeZoneLocalOption nonExistingTimeOpt, UTimeZoneLocalOption duplicatedTimeOpt, int32_t *rawOffset, int32_t *dstOffset, UErrorCode *status) |
Returns the time zone raw and GMT offset for the given moment in time. | |
C API: Calendar.
UCalendar C API is used for converting between a 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 C API 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.
UCalendar *caldef;UChar *tzId;UErrorCode status;u_uastrcpy(tzId, "PST");U_CAPI int32_t u_strlen(const UChar *s)U_CAPI UCalendar * ucal_open(const UChar *zoneID, int32_t len, const char *locale, UCalendarType type, UErrorCode *status)Open a UCalendar.@ UCAL_TRADITIONALDespite the name, UCAL_TRADITIONAL designates the locale's default calendar, which may be the Gregori...Definition ucal.h:183U_CAPI UChar * u_uastrcpy(UChar *dst, const char *src)Copy a byte string encoded in the default codepage to a ustring.#define NULLDefine NULL if necessary, to nullptr for C++ and to ((void *)0) for C.Definition utypes.h:188
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.
@ UCAL_WEEK_OF_MONTHField number indicating the week number within the current month.Definition ucal.h:263@ UCAL_DAY_OF_YEARField number indicating the day number within the current year.Definition ucal.h:279@ UCAL_DAY_OF_WEEK_IN_MONTHField number indicating the ordinal number of the day of the week within the current month.Definition ucal.h:320@ UCAL_WEEK_OF_YEARField number indicating the week number within the current year.Definition ucal.h:248
For the time of day:
Note: for some non-Gregorian calendars, different fields may be necessary for complete disambiguation. For example, a full specification of the historical 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:
24:00:00 "belongs" to the following day. That is, 23:59 on Dec 31, 1969 < 24:00 on Jan 1, 1970 < 24:01:00 on Jan 1, 1970
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 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
.
The Japanese calendar uses a combination of era name and year number. When an emperor of Japan abdicates and a new emperor ascends the throne, a new era is declared and year number is reset to 1. Even if the date of abdication is scheduled ahead of time, the new era name might not be announced until just before the date. In such case, ICU4C may include a start date of future era without actual era name, but not enabled by default. ICU4C users who want to test the behavior of the future era can enable the tentative era by:
ICU_ENABLE_TENTATIVE_ERA=true
. Definition in file ucal.h.
#define UCAL_UNKNOWN_ZONE_ID "Etc/Unknown" |
typedef void* UCalendar |
typedef enum UCalendarAMPMs UCalendarAMPMs |
typedef enum UCalendarAttribute UCalendarAttribute |
typedef enum UCalendarDateFields UCalendarDateFields |
typedef enum UCalendarDaysOfWeek UCalendarDaysOfWeek |
typedef enum UCalendarDisplayNameType UCalendarDisplayNameType |
typedef enum UCalendarLimitType UCalendarLimitType |
typedef enum UCalendarMonths UCalendarMonths |
typedef enum UCalendarType UCalendarType |
typedef enum UCalendarWallTimeOption UCalendarWallTimeOption |
typedef enum UCalendarWeekdayType UCalendarWeekdayType |
typedef enum USystemTimeZoneType USystemTimeZoneType |
typedef enum UTimeZoneLocalOption UTimeZoneLocalOption |
typedef enum UTimeZoneTransitionType UTimeZoneTransitionType |
enum UCalendarAMPMs |
enum UCalendarAttribute |
Types of UCalendar attributes.
Enumerator | |
---|---|
UCAL_LENIENT | Lenient parsing.
|
UCAL_FIRST_DAY_OF_WEEK | First day of week.
|
UCAL_MINIMAL_DAYS_IN_FIRST_WEEK | Minimum number of days in first week.
|
UCAL_REPEATED_WALL_TIME | The behavior for handling wall time repeating multiple times at negative time zone offset transitions.
|
UCAL_SKIPPED_WALL_TIME | The behavior for handling skipped wall time at positive time zone offset transitions.
|
enum UCalendarDateFields |
Possible fields in a UCalendar.
Enumerator | |
---|---|
UCAL_ERA | Field number indicating the era, e.g., AD or BC in the Gregorian (Julian) calendar. This is a calendar-specific value.
|
UCAL_YEAR | Field number indicating the year. This is a calendar-specific value.
|
UCAL_MONTH | Field number indicating the month. This is a calendar-specific value. The first month of the year is
|
UCAL_WEEK_OF_YEAR | Field number indicating the week number within the current year. The first week of the year, as defined by
|
UCAL_WEEK_OF_MONTH | Field number indicating the week number within the current month. The first week of the month, as defined by
|
UCAL_DATE | Field number indicating the day of the month. This is a synonym for
|
UCAL_DAY_OF_YEAR | Field number indicating the day number within the current year. The first day of the year has value 1.
|
UCAL_DAY_OF_WEEK | Field number indicating the day of the week. This field takes values
|
UCAL_DAY_OF_WEEK_IN_MONTH | Field number indicating the ordinal number of the day of the week within the current month. Together with the
|
UCAL_AM_PM | Field number indicating whether the E.g., at 10:04:15.250 PM the
|
UCAL_HOUR | Field number indicating the hour of the morning or afternoon.
|
UCAL_HOUR_OF_DAY | Field number indicating the hour of the day.
|
UCAL_MINUTE | Field number indicating the minute within the hour. E.g., at 10:04:15.250 PM the
|
UCAL_SECOND | Field number indicating the second within the minute. E.g., at 10:04:15.250 PM the
|
UCAL_MILLISECOND | Field number indicating the millisecond within the second. E.g., at 10:04:15.250 PM the
|
UCAL_ZONE_OFFSET | Field number indicating the raw offset from GMT in milliseconds.
|
UCAL_DST_OFFSET | Field number indicating the daylight savings offset in milliseconds.
|
UCAL_YEAR_WOY | Field number indicating the extended year corresponding to the This may be one greater or less than the value of
|
UCAL_DOW_LOCAL | 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.
|
UCAL_EXTENDED_YEAR | 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.
|
UCAL_JULIAN_DAY | 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.
|
UCAL_MILLISECONDS_IN_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.
|
UCAL_IS_LEAP_MONTH | Whether or not the current month is a leap month (0 or 1). See the Chinese calendar for an example of this. |
UCAL_ORDINAL_MONTH | Field number indicating the month. This is a calendar-specific value. Differ from UCAL_MONTH, this value is continuous and unique within a year and range from 0 to 11 or 0 to 12 depending on how many months in a year, the calendar system has leap month or not, and in leap year or not. It is the ordinal position of that month in the corresponding year of the calendar. For Chinese, Dangi, and Hebrew calendar, the range is 0 to 11 in non-leap years and 0 to 12 in leap years. For Coptic and Ethiopian calendar, the range is always 0 to 12. For other calendars supported by ICU now, the range is 0 to 11. When the number of months in a year of the identified calendar is variable, a different UCAL_ORDINAL_MONTH value can be used for dates that are part of the same named month in different years. For example, in the Hebrew calendar, "1 Nisan 5781" is associated with UCAL_ORDINAL_MONTH value 6 while "1 Nisan 5782" is associated with UCAL_ORDINAL_MONTH value 7 because 5782 is a leap year and Nisan follows the insertion of Adar I. In Chinese calendar, "Year 4664 Month 6 Day 2" is associated with UCAL_ORDINAL_MONTH value 5 while "Year 4665 Month 6 Day 2" is associated with UCAL_ORDINAL_MONTH value 6 because 4665 is a leap year and there is an extra "Leap Month 5" which associated with UCAL_ORDINAL_MONTH value 5 before "Month 6" of year 4664.
|
UCAL_FIELD_COUNT | One more than the highest normal UCalendarDateFields value.
|
UCAL_DAY_OF_MONTH | Field number indicating the day of the month. This is a synonym for
|
enum UCalendarDaysOfWeek |
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
Enumerator | |
---|---|
UCAL_SUNDAY | Sunday. |
UCAL_MONDAY | Monday. |
UCAL_TUESDAY | Tuesday. |
UCAL_WEDNESDAY | Wednesday. |
UCAL_THURSDAY | Thursday. |
UCAL_FRIDAY | Friday. |
UCAL_SATURDAY | Saturday. |
enum UCalendarLimitType |
Possible limit values for a UCalendar.
enum UCalendarMonths |
Possible months in a UCalendar.
Note: Calendar month is 0-based.
enum UCalendarType |
Possible types of UCalendars.
Enumerator | |
---|---|
UCAL_TRADITIONAL | Despite the name, UCAL_TRADITIONAL designates the locale's default calendar, which may be the Gregorian calendar or some other calendar.
|
UCAL_DEFAULT | A better name for UCAL_TRADITIONAL.
|
UCAL_GREGORIAN | Unambiguously designates the Gregorian calendar for the locale.
|
Options for handling ambiguous wall time at time zone offset transitions.
Enumerator | |
---|---|
UCAL_WALLTIME_LAST | An ambiguous wall time to be interpreted as the latest. This option is valid for UCAL_REPEATED_WALL_TIME and UCAL_SKIPPED_WALL_TIME.
|
UCAL_WALLTIME_FIRST | An ambiguous wall time to be interpreted as the earliest. This option is valid for UCAL_REPEATED_WALL_TIME and UCAL_SKIPPED_WALL_TIME.
|
UCAL_WALLTIME_NEXT_VALID | An ambiguous wall time to be interpreted as the next valid wall time. This option is valid for UCAL_SKIPPED_WALL_TIME.
|
enum UCalendarWeekdayType |
Weekday types, as returned by ucal_getDayOfWeekType().
Enumerator | |
---|---|
UCAL_WEEKDAY | Designates a full weekday (no part of the day is included in the weekend).
|
UCAL_WEEKEND | Designates a full weekend day (the entire day is included in the weekend).
|
UCAL_WEEKEND_ONSET | Designates a day that starts as a weekday and transitions to the weekend. Call ucal_getWeekendTransition() to get the time of transition.
|
UCAL_WEEKEND_CEASE | Designates a day that starts as the weekend and transitions to a weekday. Call ucal_getWeekendTransition() to get the time of transition.
|
enum USystemTimeZoneType |
System time zone type constants used by filtering zones in ucal_openTimeZoneIDEnumeration.
Enumerator | |
---|---|
UCAL_ZONE_TYPE_ANY | Any system zones.
|
UCAL_ZONE_TYPE_CANONICAL | Canonical system zones.
|
UCAL_ZONE_TYPE_CANONICAL_LOCATION | Canonical system zones associated with actual locations.
|
enum UTimeZoneLocalOption |
Options used by ucal_getTimeZoneOffsetFromLocal and BasicTimeZone::getOffsetFromLocal() to specify how to interpret an input time when it does not exist, or when it is ambiguous, around a time zone transition.
Enumerator | |
---|---|
UCAL_TZ_LOCAL_FORMER | An input time is always interpreted as local time before a time zone transition.
|
UCAL_TZ_LOCAL_LATTER | An input time is always interpreted as local time after a time zone transition.
|
UCAL_TZ_LOCAL_STANDARD_FORMER | An input time is interpreted as standard time when local time is switched to/from daylight saving time. When both sides of a time zone transition are standard time, or daylight saving time, the local time before the transition is used.
|
UCAL_TZ_LOCAL_STANDARD_LATTER | An input time is interpreted as standard time when local time is switched to/from daylight saving time. When both sides of a time zone transition are standard time, or daylight saving time, the local time after the transition is used.
|
UCAL_TZ_LOCAL_DAYLIGHT_FORMER | An input time is interpreted as daylight saving time when local time is switched to/from standard time. When both sides of a time zone transition are standard time, or daylight saving time, the local time before the transition is used.
|
UCAL_TZ_LOCAL_DAYLIGHT_LATTER | An input time is interpreted as daylight saving time when local time is switched to/from standard time. When both sides of a time zone transition are standard time, or daylight saving time, the local time after the transition is used.
|
Time zone transition types for ucal_getTimeZoneTransitionDate.
Enumerator | |
---|---|
UCAL_TZ_TRANSITION_NEXT | Get the next transition after the current date, i.e. excludes the current date
|
UCAL_TZ_TRANSITION_NEXT_INCLUSIVE | Get the next transition on or after the current date, i.e. may include the current date
|
UCAL_TZ_TRANSITION_PREVIOUS | Get the previous transition before the current date, i.e. excludes the current date
|
UCAL_TZ_TRANSITION_PREVIOUS_INCLUSIVE | Get the previous transition on or before the current date, i.e. may include the current date
|
U_CAPI void ucal_add | ( | UCalendar * | cal, |
UCalendarDateFields | field, | ||
int32_t | amount, | ||
UErrorCode * | status | ||
) |
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).
cal | The UCalendar to which to add. |
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. |
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. |
status | A pointer to an UErrorCode to receive any errors |
Clear all fields in a UCalendar.
All fields are represented as 32-bit integers.
calendar | The UCalendar to clear. |
U_CAPI void ucal_clearField | ( | UCalendar * | cal, |
UCalendarDateFields | field | ||
) |
Clear a field in a UCalendar.
All fields are represented as 32-bit integers.
cal | The UCalendar containing the field to clear. |
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. |
U_CAPI UCalendar * ucal_clone | ( | const UCalendar * | cal, |
UErrorCode * | status | ||
) |
Open a copy of a UCalendar.
This function performs a deep copy.
cal | The calendar to copy |
status | A pointer to an UErrorCode to receive any errors. |
Close a UCalendar.
Once closed, a UCalendar may no longer be used.
cal | The UCalendar to close. |
U_CAPI int32_t ucal_countAvailable | ( | void | ) |
Determine how many locales have calendars available.
This function is most useful as determining the loop ending condition for calls to ucal_getAvailable.
Returns true if two UCalendars are equivalent.
Equivalent UCalendars will behave identically, but they may be set to different times.
cal1 | The first of the UCalendars to compare. |
cal2 | The second of the UCalendars to compare. |
U_CAPI int32_t ucal_get | ( | const UCalendar * | cal, |
UCalendarDateFields | field, | ||
UErrorCode * | status | ||
) |
Get the current value of a field from a UCalendar.
All fields are represented as 32-bit integers.
cal | The UCalendar to query. |
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. |
status | A pointer to an UErrorCode to receive any errors |
U_CAPI int32_t ucal_getAttribute | ( | const UCalendar * | cal, |
UCalendarAttribute | attr | ||
) |
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.
cal | The UCalendar to query. |
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 |
U_CAPI const char * ucal_getAvailable | ( | int32_t | localeIndex | ) |
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.
localeIndex | The index of the desired locale. |
U_CAPI int32_t ucal_getCanonicalTimeZoneID | ( | const UChar * | id, |
int32_t | len, | ||
UChar * | result, | ||
int32_t | resultCapacity, | ||
UBool * | isSystemID, | ||
UErrorCode * | status | ||
) |
Returns the canonical system timezone ID or the normalized custom time zone ID for the given time zone ID.
id | The input timezone ID to be canonicalized. |
len | The length of id, or -1 if null-terminated. |
result | The buffer receives the canonical system timezone ID or the custom timezone ID in normalized format. |
resultCapacity | The capacity of the result buffer. |
isSystemID | Receives if the given ID is a known system timezone ID. |
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. |
U_CAPI UCalendarWeekdayType ucal_getDayOfWeekType | ( | const UCalendar * | cal, |
UCalendarDaysOfWeek | dayOfWeek, | ||
UErrorCode * | status | ||
) |
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.
cal | The UCalendar to query. |
dayOfWeek | The day of the week whose type is desired (UCAL_SUNDAY..UCAL_SATURDAY). |
status | The error code for the operation. |
U_CAPI int32_t ucal_getDefaultTimeZone | ( | UChar * | result, |
int32_t | resultCapacity, | ||
UErrorCode * | ec | ||
) |
Return the default time zone.
The default is determined initially by querying the host operating system. If the host system detection routines fail, or if they specify a TimeZone or TimeZone offset which is not recognized, then the special TimeZone "Etc/Unknown" is returned.
The default may be changed with ucal_setDefaultTimeZone()
or with the C++ TimeZone API, TimeZone::adoptDefault(TimeZone*)
.
result | A buffer to receive the result, or NULL |
resultCapacity | The capacity of the result buffer |
ec | input/output error code |
U_CAPI int32_t ucal_getDSTSavings | ( | 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.
zoneID | null-terminated time zone ID |
ec | input/output error code |
U_CAPI int32_t ucal_getFieldDifference | ( | UCalendar * | cal, |
UDate | target, | ||
UCalendarDateFields | field, | ||
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.
cal | The UCalendar to compare and update. |
target | The target date to compare to the current calendar setting. |
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. |
status | A pointer to an UErrorCode to receive any errors |
U_CAPI UDate ucal_getGregorianChange | ( | const UCalendar * | cal, |
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.
cal | The calendar object. |
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.) |
U_CAPI int32_t ucal_getHostTimeZone | ( | UChar * | result, |
int32_t | resultCapacity, | ||
UErrorCode * | ec | ||
) |
Return the current host time zone.
The host time zone is detected from the current host system configuration by querying the host operating system. If the host system detection routines fail, or if they specify a TimeZone or TimeZone offset which is not recognized, then the special TimeZone "Etc/Unknown" is returned.
Note that host time zone and the ICU default time zone can be different.
The ICU default time zone does not change once initialized unless modified by calling ucal_setDefaultTimeZone()
or with the C++ TimeZone API, TimeZone::adoptDefault(TimeZone*)
.
If the host operating system configuration has changed since ICU has initialized then the returned value can be different than the ICU default time zone, even if the default has not changed.
This function is not thread safe.
result | A buffer to receive the result, or NULL |
resultCapacity | The capacity of the result buffer |
ec | input/output error code |
U_CAPI int32_t ucal_getIanaTimeZoneID | ( | const UChar * | id, |
int32_t | len, | ||
UChar * | result, | ||
int32_t | resultCapacity, | ||
UErrorCode * | status | ||
) |
Returns the preferred time zone ID in the IANA time zone database for the given time zone ID.
There are two types of preferred IDs. The first type is the one defined in zone.tab file, such as "America/Los_Angeles". The second types is the one defined for zones not associated with a specific region, but not defined with "Link" syntax such as "Etc/GMT+10".
Note: For most of valid time zone IDs, this method returns an ID same as ucal_getCanonicalTimeZoneID(). ucal_getCanonicalTimeZoneID() is based on canonical time zone IDs defined in Unicode CLDR. These canonical time zone IDs in CLDR were based on very old version of the time zone database. In the IANA time zone database, some IDs were updated since then. This API returns a newer time zone ID. For example, CLDR defines "Asia/Calcutta" as the canonical time zone ID. This method returns "Asia/Kolkata" instead.
"Etc/Unknown" is a special time zone ID defined by CLDR. There are no corresponding zones in the IANA time zone database. Therefore, this API returns U_ILLEGAL_ARGUMENT_ERROR when the input ID is "Etc/Unknown".
id | The input time zone ID. |
len | The length of the input time zone ID. |
result | The buffer receives the preferred time zone ID in the IANA time zone database. |
resultCapacity | The capacity of the result buffer. |
status | Receives the status. When the given time zone ID is not a known system time zone ID, U_ILLEGAL_ARGUMENT_ERROR is set. |
U_CAPI UEnumeration * ucal_getKeywordValuesForLocale | ( | const char * | key, |
const char * | locale, | ||
UBool | commonlyUsed, | ||
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.
key | one of the keys supported by this service. For now, only "calendar" is supported. |
locale | the locale |
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. |
status | error status |
U_CAPI int32_t ucal_getLimit | ( | const UCalendar * | cal, |
UCalendarDateFields | field, | ||
UCalendarLimitType | type, | ||
UErrorCode * | status | ||
) |
Determine a limit for a field in a UCalendar.
A limit is a maximum or minimum value for a field.
cal | The UCalendar to query. |
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. |
type | The desired critical point; one of UCAL_MINIMUM, UCAL_MAXIMUM, UCAL_GREATEST_MINIMUM, UCAL_LEAST_MAXIMUM, UCAL_ACTUAL_MINIMUM, UCAL_ACTUAL_MAXIMUM |
status | A pointer to an UErrorCode to receive any errors. |
U_CAPI const char * ucal_getLocaleByType | ( | const UCalendar * | cal, |
ULocDataLocaleType | type, | ||
UErrorCode * | status | ||
) |
Get the locale for this calendar object.
You can choose between valid and actual locale.
cal | The calendar object |
type | type of the locale we're looking for (valid or actual) |
status | error code for the operation |
U_CAPI UDate ucal_getMillis | ( | const UCalendar * | cal, |
UErrorCode * | status | ||
) |
Get a UCalendar's current time in millis.
The time is represented as milliseconds from the epoch.
cal | The UCalendar to query. |
status | A pointer to an UErrorCode to receive any errors |
Get the current date and time.
The value returned is represented as milliseconds from the epoch.
U_CAPI int32_t ucal_getTimeZoneDisplayName | ( | const UCalendar * | cal, |
UCalendarDisplayNameType | type, | ||
const char * | locale, | ||
UChar * | result, | ||
int32_t | resultLength, | ||
UErrorCode * | status | ||
) |
Get the display name for a UCalendar's TimeZone.
A display name is suitable for presentation to a user.
cal | The UCalendar to query. |
type | The desired display name format; one of UCAL_STANDARD, UCAL_SHORT_STANDARD, UCAL_DST, UCAL_SHORT_DST |
locale | The desired locale for the display name. |
result | A pointer to a buffer to receive the formatted number. |
resultLength | The maximum size of result. |
status | A pointer to an UErrorCode to receive any errors |
U_CAPI int32_t ucal_getTimeZoneID | ( | const UCalendar * | cal, |
UChar * | result, | ||
int32_t | resultLength, | ||
UErrorCode * | status | ||
) |
Get the ID of the UCalendar's time zone.
cal | The UCalendar to query. |
result | Receives the UCalendar's time zone ID. |
resultLength | The maximum size of result. |
status | Receives the status. |
U_CAPI int32_t ucal_getTimeZoneIDForWindowsID | ( | const UChar * | winid, |
int32_t | len, | ||
const char * | region, | ||
UChar * | id, | ||
int32_t | idCapacity, | ||
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.
winid | A Windows time zone ID. |
len | The length of winid , or -1 if null-terminated. |
region | A null-terminated region code, or NULL if no regional preference. |
id | A buffer to receive a system time zone ID. |
idCapacity | The capacity of the result buffer id . |
status | Receives the status. |
U_CAPI void ucal_getTimeZoneOffsetFromLocal | ( | const UCalendar * | cal, |
UTimeZoneLocalOption | nonExistingTimeOpt, | ||
UTimeZoneLocalOption | duplicatedTimeOpt, | ||
int32_t * | rawOffset, | ||
int32_t * | dstOffset, | ||
UErrorCode * | status | ||
) |
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.
cal | The UCalendar which specify the local date and time value to query. |
nonExistingTimeOpt | The option to indicate how to interpret the date and time in the calendar represent a local time that skipped at a positive time zone transitions (e.g. when the daylight saving time starts or the time zone offset is increased due to a time zone rule change). |
duplicatedTimeOpt | The option to indicate how to interpret the date and time in the calendar represent a local time that repeating multiple times at a negative time zone transition (e.g. when the daylight saving time ends or the time zone offset is decreased due to a time zone rule change) |
rawOffset | output parameter to receive the raw offset, that is, the offset not including DST adjustments. If the status is set to one of the error code, the value set is unspecified. |
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. If the status is set to one of the error code, the value set is unspecified. |
status | A pointer to a UErrorCode to receive any errors. |
U_CAPI UBool ucal_getTimeZoneTransitionDate | ( | const UCalendar * | cal, |
UTimeZoneTransitionType | type, | ||
UDate * | transition, | ||
UErrorCode * | status | ||
) |
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.
cal | The UCalendar to query. |
type | The type of transition desired. |
transition | A pointer to a UDate to be set to the transition time. If the function returns false, the value set is unspecified. |
status | A pointer to a UErrorCode to receive any errors. |
U_CAPI const char * ucal_getType | ( | const UCalendar * | cal, |
UErrorCode * | status | ||
) |
Get the resource keyword value string designating the calendar type for the UCalendar.
cal | The UCalendar to query. |
status | The error code for the operation. |
U_CAPI const char * ucal_getTZDataVersion | ( | UErrorCode * | status | ) |
Returns the timezone data version currently used by ICU.
status | error code for the operation |
U_CAPI int32_t ucal_getWeekendTransition | ( | 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).
cal | The UCalendar to query. |
dayOfWeek | The day of the week for which the weekend transition time is desired (UCAL_SUNDAY..UCAL_SATURDAY). |
status | The error code for the operation. |
U_CAPI int32_t ucal_getWindowsTimeZoneID | ( | const UChar * | id, |
int32_t | len, | ||
UChar * | winid, | ||
int32_t | winidCapacity, | ||
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.
id | A system time zone ID. |
len | The length of id , or -1 if null-terminated. |
winid | A buffer to receive a Windows time zone ID. |
winidCapacity | The capacity of the result buffer winid . |
status | Receives the status. |
U_CAPI UBool ucal_inDaylightTime | ( | const UCalendar * | cal, |
UErrorCode * | status | ||
) |
Determine if a UCalendar is currently in daylight savings time.
Daylight savings time is not used in all parts of the world.
cal | The UCalendar to query. |
status | A pointer to an UErrorCode to receive any errors |
U_CAPI UBool ucal_isSet | ( | const UCalendar * | cal, |
UCalendarDateFields | field | ||
) |
Determine if a field in a UCalendar is set.
All fields are represented as 32-bit integers.
cal | The UCalendar to query. |
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. |
U_CAPI UBool ucal_isWeekend | ( | const UCalendar * | cal, |
UDate | date, | ||
UErrorCode * | status | ||
) |
Returns true if the given UDate is in the weekend in this calendar system.
cal | The UCalendar to query. |
date | The UDate in question. |
status | The error code for the operation. |
U_CAPI UCalendar * ucal_open | ( | const UChar * | zoneID, |
int32_t | len, | ||
const char * | locale, | ||
UCalendarType | type, | ||
UErrorCode * | status | ||
) |
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
.
zoneID | The desired TimeZone ID. If 0, use the default time zone. |
len | The length of zoneID, or -1 if null-terminated. |
locale | The desired locale |
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. |
status | A pointer to an UErrorCode to receive any errors |
U_CAPI UEnumeration * ucal_openCountryTimeZones | ( | const char * | country, |
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.
country | the ISO 3166 two-letter country code, or NULL to retrieve zones not affiliated with any country |
ec | input/output error code |
U_CAPI UEnumeration * ucal_openTimeZoneIDEnumeration | ( | USystemTimeZoneType | zoneType, |
const char * | region, | ||
const int32_t * | rawOffset, | ||
UErrorCode * | ec | ||
) |
Create an enumeration over system time zone IDs with the given filter conditions.
zoneType | The system time zone type. |
region | The ISO 3166 two-letter country code or UN M.49 three-digit area code. When NULL, no filtering done by region. |
rawOffset | An offset from GMT in milliseconds, ignoring the effect of daylight savings time, if any. When NULL, no filtering done by zone offset. |
ec | A pointer to an UErrorCode to receive any errors |
U_CAPI UEnumeration * ucal_openTimeZones | ( | UErrorCode * | ec | ) |
Create an enumeration over all time zones.
ec | input/output error code |
U_CAPI void ucal_roll | ( | 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).
cal | The UCalendar to which to add. |
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. |
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. |
status | A pointer to an UErrorCode to receive any errors |
U_CAPI void ucal_set | ( | UCalendar * | cal, |
UCalendarDateFields | field, | ||
int32_t | value | ||
) |
Set the value of a field in a UCalendar.
All fields are represented as 32-bit integers.
cal | The UCalendar to set. |
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. |
value | The desired value of field. |
U_CAPI void ucal_setAttribute | ( | UCalendar * | cal, |
UCalendarAttribute | attr, | ||
int32_t | newValue | ||
) |
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.
cal | The UCalendar to set. |
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 |
newValue | The new value of attr. |
U_CAPI void 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.
cal | The UCalendar to set. |
year | The desired year. |
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 |
date | The desired day of the month. |
status | A pointer to an UErrorCode to receive any errors |
U_CAPI void ucal_setDateTime | ( | UCalendar * | cal, |
int32_t | year, | ||
int32_t | month, | ||
int32_t | date, | ||
int32_t | hour, | ||
int32_t | minute, | ||
int32_t | second, | ||
UErrorCode * | status | ||
) |
Set a UCalendar's current date.
The date is represented as a series of 32-bit integers.
cal | The UCalendar to set. |
year | The desired year. |
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 |
date | The desired day of the month. |
hour | The desired hour of day. |
minute | The desired minute. |
second | The desirec second. |
status | A pointer to an UErrorCode to receive any errors |
U_CAPI void ucal_setDefaultTimeZone | ( | const UChar * | zoneID, |
UErrorCode * | ec | ||
) |
Set the default time zone.
zoneID | null-terminated time zone ID |
ec | input/output error code |
U_CAPI void ucal_setGregorianChange | ( | UCalendar * | cal, |
UDate | date, | ||
UErrorCode * | pErrorCode | ||
) |
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.
cal | The calendar object. |
date | The given Gregorian cutover date. |
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.) |
U_CAPI void ucal_setMillis | ( | UCalendar * | cal, |
UDate | dateTime, | ||
UErrorCode * | status | ||
) |
Set a UCalendar's current time in millis.
The time is represented as milliseconds from the epoch.
cal | The UCalendar to set. |
dateTime | The desired date and time. |
status | A pointer to an UErrorCode to receive any errors |
U_CAPI void ucal_setTimeZone | ( | UCalendar * | cal, |
const UChar * | zoneID, | ||
int32_t | len, | ||
UErrorCode * | status | ||
) |
Set the TimeZone used by a UCalendar.
A UCalendar uses a timezone for converting from Greenwich time to local time.
cal | The UCalendar to set. |
zoneID | The desired TimeZone ID. If 0, use the default time zone. |
len | The length of zoneID, or -1 if null-terminated. |
status | A pointer to an UErrorCode to receive any errors. |