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ucal.h File Reference

C API: Calendar. More...

#include "unicode/utypes.h"

Go to the source code of this file.

Typedefs

typedef void * UCalendar
 A calendar. More...

typedef enum UCalendarType UCalendarType
 @stable.

typedef enum UCalendarDateFields UCalendarDateFields
 @stable.

typedef enum UCalendarDaysOfWeek UCalendarDaysOfWeek
 @stable.

typedef enum UCalendarMonths UCalendarMonths
 @stable.

typedef enum UCalendarAMPMs UCalendarAMPMs
 @stable.

typedef enum UCalendarDisplayNameType UCalendarDisplayNameType
 @stable.

typedef enum UCalendarAttribute UCalendarAttribute
 @stable.

typedef enum UCalendarLimitType UCalendarLimitType
 @stable.


Enumerations

enum  UCalendarType { UCAL_TRADITIONAL, UCAL_GREGORIAN }
 Possible types of UCalendars @stable. More...

enum  UCalendarDateFields {
  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, UCAL_YEAR_WOY, UCAL_DOW_LOCAL, UCAL_FIELD_COUNT
}
 Possible fields in a UCalendar @stable. More...

enum  UCalendarDaysOfWeek {
  UCAL_SUNDAY = 1, UCAL_MONDAY, UCAL_TUESDAY, UCAL_WEDNESDAY,
  UCAL_THURSDAY, UCAL_FRIDAY, UCAL_SATURDAY
}
 Possible days of the week in a UCalendar @stable. More...

enum  UCalendarMonths {
  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
}
 Possible months in a UCalendar. More...

enum  UCalendarAMPMs { UCAL_AM, UCAL_PM }
 Possible AM/PM values in a UCalendar @stable. More...

enum  UCalendarDisplayNameType { UCAL_STANDARD, UCAL_SHORT_STANDARD, UCAL_DST, UCAL_SHORT_DST }
 Possible formats for a UCalendar's display name @stable. More...

enum  UCalendarAttribute { UCAL_LENIENT, UCAL_FIRST_DAY_OF_WEEK, UCAL_MINIMAL_DAYS_IN_FIRST_WEEK }
 Types of UCalendar attributes @stable. More...

enum  UCalendarLimitType {
  UCAL_MINIMUM, UCAL_MAXIMUM, UCAL_GREATEST_MINIMUM, UCAL_LEAST_MAXIMUM,
  UCAL_ACTUAL_MINIMUM, UCAL_ACTUAL_MAXIMUM
}
 Possible limit values for a UCalendar @stable. More...


Functions

U_CAPI const UChar *U_EXPORT2 ucal_getAvailableTZIDs (int32_t rawOffset, int32_t index, UErrorCode *status)
 Get an available TimeZone ID. More...

U_CAPI int32_t U_EXPORT2 ucal_countAvailableTZIDs (int32_t rawOffset)
 Determine how many TimeZones exist with a certain offset. More...

U_CAPI UDate U_EXPORT2 ucal_getNow (void)
 Get the current date and time. More...

U_CAPI UCalendar *U_EXPORT2 ucal_open (const UChar *zoneID, int32_t len, const char *locale, UCalendarType type, UErrorCode *status)
 Open a UCalendar. More...

U_CAPI void U_EXPORT2 ucal_close (UCalendar *cal)
 Close a UCalendar. More...

U_CAPI void U_EXPORT2 ucal_setTimeZone (UCalendar *cal, const UChar *zoneID, int32_t len, UErrorCode *status)
 Set the TimeZone used by a UCalendar. More...

U_CAPI int32_t U_EXPORT2 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. More...

U_CAPI UBool U_EXPORT2 ucal_inDaylightTime (const UCalendar *cal, UErrorCode *status)
 Determine if a UCalendar is currently in daylight savings time. More...

U_CAPI int32_t U_EXPORT2 ucal_getAttribute (const UCalendar *cal, UCalendarAttribute attr)
 Get a numeric attribute associated with a UCalendar. More...

U_CAPI void U_EXPORT2 ucal_setAttribute (UCalendar *cal, UCalendarAttribute attr, int32_t newValue)
 Set a numeric attribute associated with a UCalendar. More...

U_CAPI const char *U_EXPORT2 ucal_getAvailable (int32_t index)
 Get a locale for which calendars are available. More...

U_CAPI int32_t U_EXPORT2 ucal_countAvailable (void)
 Determine how many locales have calendars available. More...

U_CAPI UDate U_EXPORT2 ucal_getMillis (const UCalendar *cal, UErrorCode *status)
 Get a UCalendar's current time in millis. More...

U_CAPI void U_EXPORT2 ucal_setMillis (UCalendar *cal, UDate dateTime, UErrorCode *status)
 Set a UCalendar's current time in millis. More...

U_CAPI void U_EXPORT2 ucal_setDate (UCalendar *cal, int32_t year, int32_t month, int32_t date, UErrorCode *status)
 Set a UCalendar's current date. More...

U_CAPI 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)
 Set a UCalendar's current date. More...

U_CAPI UBool U_EXPORT2 ucal_equivalentTo (const UCalendar *cal1, const UCalendar *cal2)
 Determine if two UCalendars represent the same date. More...

U_CAPI 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. More...

U_CAPI void U_EXPORT2 ucal_roll (UCalendar *cal, UCalendarDateFields field, int32_t amount, UErrorCode *status)
 Add a specified signed amount to a particular field in a UCalendar. More...

U_CAPI int32_t U_EXPORT2 ucal_get (const UCalendar *cal, UCalendarDateFields field, UErrorCode *status)
 Get the current value of a field from a UCalendar. More...

U_CAPI void U_EXPORT2 ucal_set (UCalendar *cal, UCalendarDateFields field, int32_t value)
 Set the value of a field in a UCalendar. More...

U_CAPI UBool U_EXPORT2 ucal_isSet (const UCalendar *cal, UCalendarDateFields field)
 Determine if a field in a UCalendar is set. More...

U_CAPI void U_EXPORT2 ucal_clearField (UCalendar *cal, UCalendarDateFields field)
 Clear a field in a UCalendar. More...

U_CAPI void U_EXPORT2 ucal_clear (UCalendar *calendar)
 Clear all fields in a UCalendar. More...

U_CAPI int32_t U_EXPORT2 ucal_getLimit (const UCalendar *cal, UCalendarDateFields field, UCalendarLimitType type, UErrorCode *status)
 Determine a limit for a field in a UCalendar. More...


Detailed Description

C API: Calendar.

Calendar C API

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 U_CAPI 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;
 tzId=(UChar*)malloc(sizeof(UChar) * (strlen("PST") +1) );
 u_uastrcpy(tzId, "PST");
 caldef=ucal_open(tzID, u_strlen(tzID), NULL, UCAL_TRADITIONAL, &status);

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_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

For the time of day:

 
 UCAL_HOUR_OF_DAY
 UCAL_AM_PM + UCAL_HOUR

Note: for some non-Gregorian calendars, different fields may be necessary for complete disambiguation. For example, a full specification of the historial Arabic astronomical calendar requires year, month, day-of-month and day-of-week in some cases.

Note: There are certain possible ambiguities in interpretation of certain singular times, which are resolved in the following ways:

  1. 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

  2. Although historically not precise, midnight also belongs to "am", and noon belongs to "pm", so on the same day, 12:00 am (midnight) < 12:01 am, and 12:00 pm (noon) < 12:01 pm

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 UDateFormat 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


Typedef Documentation

typedef void* UCalendar
 

A calendar.

For usage in C programs. @stable


Enumeration Type Documentation

enum UCalendarAMPMs
 

Possible AM/PM values in a UCalendar @stable.

Enumeration values:
UCAL_AM  AM.
UCAL_PM  PM.

enum UCalendarAttribute
 

Types of UCalendar attributes @stable.

Enumeration values:
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.

enum UCalendarDateFields
 

Possible fields in a UCalendar @stable.

Enumeration values:
UCAL_ERA  Era field.
UCAL_YEAR  Year field.
UCAL_MONTH  Month field.
UCAL_WEEK_OF_YEAR  Week of year field.
UCAL_WEEK_OF_MONTH  Week of month field.
UCAL_DATE  Date field.
UCAL_DAY_OF_YEAR  Day of year field.
UCAL_DAY_OF_WEEK  Day of week field.
UCAL_DAY_OF_WEEK_IN_MONTH  Day of week in month field.
UCAL_AM_PM  AM/PM field.
UCAL_HOUR  Hour field.
UCAL_HOUR_OF_DAY  Hour of day field.
UCAL_MINUTE  Minute field.
UCAL_SECOND  Second field.
UCAL_MILLISECOND  Millisecond field.
UCAL_ZONE_OFFSET  Zone offset field.
UCAL_DST_OFFSET  DST offset field.
UCAL_YEAR_WOY  Year / week of year.
UCAL_DOW_LOCAL  Day of week, localized (1..7).
UCAL_FIELD_COUNT  Field count.

enum UCalendarDaysOfWeek
 

Possible days of the week in a UCalendar @stable.

Enumeration values:
UCAL_SUNDAY  Sunday.
UCAL_MONDAY  Monday.
UCAL_TUESDAY  Tuesday.
UCAL_WEDNESDAY  Wednesday.
UCAL_THURSDAY  Thursday.
UCAL_FRIDAY  Friday.
UCAL_SATURDAY  Saturday.

enum UCalendarDisplayNameType
 

Possible formats for a UCalendar's display name @stable.

Enumeration values:
UCAL_STANDARD  Standard display name.
UCAL_SHORT_STANDARD  Short standard display name.
UCAL_DST  Daylight savings display name.
UCAL_SHORT_DST  Short daylight savings display name.

enum UCalendarLimitType
 

Possible limit values for a UCalendar @stable.

Enumeration values:
UCAL_MINIMUM  Minimum value.
UCAL_MAXIMUM  Maximum value.
UCAL_GREATEST_MINIMUM  Greatest minimum value.
UCAL_LEAST_MAXIMUM  Leaest maximum value.
UCAL_ACTUAL_MINIMUM  Actual minimum value.
UCAL_ACTUAL_MAXIMUM  Actual maximum value.

enum UCalendarMonths
 

Possible months in a UCalendar.

Note: Calendar month is 0-based. @stable

Enumeration values:
UCAL_JANUARY  January.
UCAL_FEBRUARY  February.
UCAL_MARCH  March.
UCAL_APRIL  April.
UCAL_MAY  May.
UCAL_JUNE  June.
UCAL_JULY  July.
UCAL_AUGUST  August.
UCAL_SEPTEMBER  September.
UCAL_OCTOBER  October.
UCAL_NOVEMBER  November.
UCAL_DECEMBER  December.
UCAL_UNDECIMBER  Undecimber.

enum UCalendarType
 

Possible types of UCalendars @stable.

Enumeration values:
UCAL_TRADITIONAL  A traditional calendar for the locale.
UCAL_GREGORIAN  The Gregorian calendar.


Function Documentation

U_CAPI 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 can modify more significant fields in the calendar.

Parameters:
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
See also:
ucal_roll @stable

U_CAPI void U_EXPORT2 ucal_clear UCalendar   calendar
 

Clear all fields in a UCalendar.

All fields are represented as 32-bit integers.

Parameters:
cal  The UCalendar to clear.
See also:
ucal_get , ucal_set , ucal_isSet , ucal_clearField @stable

U_CAPI void U_EXPORT2 ucal_clearField UCalendar   cal,
UCalendarDateFields    field
 

Clear a field in a UCalendar.

All fields are represented as 32-bit integers.

Parameters:
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.
See also:
ucal_get , ucal_set , ucal_isSet , ucal_clear @stable

U_CAPI void U_EXPORT2 ucal_close UCalendar   cal
 

Close a UCalendar.

Once closed, a UCalendar may no longer be used.

Parameters:
cal  The UCalendar to close. @stable

U_CAPI int32_t U_EXPORT2 ucal_countAvailable void   
 

Determine how many locales have calendars available.

This function is most useful as determining the loop ending condition for calls to \Ref{ucal_getAvailable}.

Returns:
The number of locales for which calendars are available.
See also:
ucal_getAvailable @stable

U_CAPI int32_t U_EXPORT2 ucal_countAvailableTZIDs int32_t    rawOffset
 

Determine how many TimeZones exist with a certain offset.

This function is most useful as determining the loop ending condition for calls to \Ref{ucal_getAvailableTZIDs}.

Parameters:
rawOffset  The desired GMT offset.
Returns:
The number of TimeZones with rawOffset.
See also:
ucal_getAvailableTZIDs @stable

U_CAPI UBool U_EXPORT2 ucal_equivalentTo const UCalendar   cal1,
const UCalendar   cal2
 

Determine if two UCalendars represent the same date.

Two UCalendars may represent the same date and have different fields if they are in different time zones.

Parameters:
cal1  The first of the UCalendars to compare.
cal2  The second of the UCalendars to compare.
Returns:
TRUE if cal1 and cal2 represent the same date, FALSE otherwise. @stable

U_CAPI int32_t U_EXPORT2 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.

Parameters:
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
Returns:
The value of the desired field.
See also:
ucal_set , ucal_isSet , ucal_clearField , ucal_clear @stable

U_CAPI int32_t U_EXPORT2 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.

Parameters:
cal  The UCalendar to query.
attr  The desired attribute; one of UCAL_LENIENT, UCAL_FIRST_DAY_OF_WEEK, or UCAL_MINIMAL_DAYS_IN_FIRST_WEEK
Returns:
The value of attr.
See also:
ucal_setAttribute @stable

U_CAPI const char* U_EXPORT2 ucal_getAvailable int32_t    index
 

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.

Parameters:
index  The index of the desired locale.
Returns:
A locale for which calendars are available, or 0 if none.
See also:
ucal_countAvailable @stable

U_CAPI const UChar* U_EXPORT2 ucal_getAvailableTZIDs int32_t    rawOffset,
int32_t    index,
UErrorCode   status
 

Get an available TimeZone ID.

A Timezone ID is a string of the form "America/Los Angeles".

Parameters:
rawOffset  The desired GMT offset
index  The index of the desired TimeZone.
status  A pointer to an UErrorCode to receive any errors
Returns:
The requested TimeZone ID, or 0 if not found
See also:
ucal_countAvailableTZIDs @stable

U_CAPI int32_t U_EXPORT2 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.

Parameters:
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.
Returns:
The requested value. @stable

U_CAPI UDate U_EXPORT2 ucal_getMillis const UCalendar   cal,
UErrorCode   status
 

Get a UCalendar's current time in millis.

The time is represented as milliseconds from the epoch.

Parameters:
cal  The UCalendar to query.
status  A pointer to an UErrorCode to receive any errors
Returns:
The calendar's current time in millis.
See also:
ucal_setMillis , ucal_setDate , ucal_setDateTime @stable

U_CAPI UDate U_EXPORT2 ucal_getNow void   
 

Get the current date and time.

The value returned is represented as milliseconds from the epoch.

Returns:
The current date and time. @stable

U_CAPI int32_t U_EXPORT2 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.

Parameters:
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.
status  A pointer to an UErrorCode to receive any errors
result  A pointer to a buffer to receive the formatted number.
resultLength  The maximum size of result.
resultLengthNeeded  If not 0, on output the number of characters actually written to result.
Returns:
The total buffer size needed; if greater than resultLength, the output was truncated. @stable

U_CAPI UBool U_EXPORT2 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.

Parameters:
cal  The UCalendar to query.
status  A pointer to an UErrorCode to receive any errors
Returns:
TRUE if cal is currently in daylight savings time, FALSE otherwise @stable

U_CAPI UBool U_EXPORT2 ucal_isSet const UCalendar   cal,
UCalendarDateFields    field
 

Determine if a field in a UCalendar is set.

All fields are represented as 32-bit integers.

Parameters:
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.
return  TRUE if field is set, FALSE otherwise.
See also:
ucal_get , ucal_set , ucal_clearField , ucal_clear @stable

U_CAPI UCalendar* U_EXPORT2 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.

Parameters:
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.
status  A pointer to an UErrorCode to receive any errors
Returns:
A pointer to a UCalendar, or 0 if an error occurred. @stable

U_CAPI void U_EXPORT2 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.

Parameters:
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
See also:
ucal_add @stable

U_CAPI void U_EXPORT2 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.

Parameters:
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.
See also:
ucal_get , ucal_isSet , ucal_clearField , ucal_clear @stable

U_CAPI void U_EXPORT2 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.

Parameters:
cal  The UCalendar to set.
attr  The desired attribute; one of UCAL_LENIENT, UCAL_FIRST_DAY_OF_WEEK, or UCAL_MINIMAL_DAYS_IN_FIRST_WEEK
newValue  The new value of attr.
See also:
ucal_getAttribute @stable

U_CAPI 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.

Parameters:
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
See also:
ucal_getMillis , ucal_setMillis , ucal_setDateTime @stable

U_CAPI 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
 

Set a UCalendar's current date.

The date is represented as a series of 32-bit integers.

Parameters:
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
See also:
ucal_getMillis , ucal_setMillis , ucal_setDate @stable

U_CAPI void U_EXPORT2 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.

Parameters:
cal  The UCalendar to set.
dateTime  The desired date and time.
status  A pointer to an UErrorCode to receive any errors
See also:
ucal_getMillis , ucal_setDate , ucal_setDateTime @stable

U_CAPI void U_EXPORT2 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.

Parameters:
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. @stable


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