# The IntlCalendar class

(PHP 5 >= 5.5.0, PHP 7, PHP 8, PECL >= 3.0.0a1)

## Introduction

## Class synopsis

class IntlCalendar {
/* Constants */
public const int FIELD_ERA;
public const int FIELD_YEAR;
public const int FIELD_MONTH;
public const int FIELD_WEEK_OF_YEAR;
public const int FIELD_WEEK_OF_MONTH;
public const int FIELD_DATE;
public const int FIELD_DAY_OF_YEAR;
public const int FIELD_DAY_OF_WEEK;
public const int FIELD_DAY_OF_WEEK_IN_MONTH;
public const int FIELD_AM_PM;
public const int FIELD_HOUR;
public const int FIELD_HOUR_OF_DAY;
public const int FIELD_MINUTE;
public const int FIELD_SECOND;
public const int FIELD_MILLISECOND;
public const int FIELD_ZONE_OFFSET;
public const int FIELD_DST_OFFSET;
public const int FIELD_YEAR_WOY;
public const int FIELD_DOW_LOCAL;
public const int FIELD_EXTENDED_YEAR;
public const int FIELD_JULIAN_DAY;
public const int FIELD_MILLISECONDS_IN_DAY;
public const int FIELD_IS_LEAP_MONTH;
public const int FIELD_FIELD_COUNT;
public const int FIELD_DAY_OF_MONTH;
public const int DOW_SUNDAY;
public const int DOW_MONDAY;
public const int DOW_TUESDAY;
public const int DOW_WEDNESDAY;
public const int DOW_THURSDAY;
public const int DOW_FRIDAY;
public const int DOW_SATURDAY;
public const int DOW_TYPE_WEEKDAY;
public const int DOW_TYPE_WEEKEND;
public const int DOW_TYPE_WEEKEND_OFFSET;
public const int DOW_TYPE_WEEKEND_CEASE;
public const int WALLTIME_FIRST;
public const int WALLTIME_LAST;
public const int WALLTIME_NEXT_VALID;
/* Methods */
private __construct()
public add(int `$field`, int `$value`): bool
public after(IntlCalendar `$other`): bool
public before(IntlCalendar `$other`): bool
public clear(?int `$field` = `null`): true
public static createInstance(IntlTimeZone|DateTimeZone|string|null `$timezone` = `null`, ?string `$locale` = `null`): ?IntlCalendar
public equals(IntlCalendar `$other`): bool
public fieldDifference(float `$timestamp`, int `$field`): int|false
public static fromDateTime(DateTime|string `$datetime`, ?string `$locale` = `null`): ?IntlCalendar
public get(int `$field`): int|false
public getActualMaximum(int `$field`): int|false
public getActualMinimum(int `$field`): int|false
public static getAvailableLocales(): array
public getDayOfWeekType(int `$dayOfWeek`): int|false
public getErrorCode(): int|false
public getErrorMessage(): string|false
public getFirstDayOfWeek(): int|false
public getGreatestMinimum(int `$field`): int|false
public static getKeywordValuesForLocale(string `$keyword`, string `$locale`, bool `$onlyCommon`): IntlIterator|false
public getLeastMaximum(int `$field`): int|false
public getLocale(int `$type`): string|false
public getMaximum(int `$field`): int|false
public getMinimalDaysInFirstWeek(): int|false
public getMinimum(int `$field`): int|false
public static getNow(): float
public getRepeatedWallTimeOption(): int
public getSkippedWallTimeOption(): int
public getTime(): float|false
public getTimeZone(): IntlTimeZone|false
public getType(): string
public getWeekendTransition(int `$dayOfWeek`): int|false
public inDaylightTime(): bool
public isEquivalentTo(IntlCalendar `$other`): bool
public isLenient(): bool
public isSet(int `$field`): bool
public isWeekend(?float `$timestamp` = `null`): bool
public roll(int `$field`, int|bool `$value`): bool
public set(int `$field`, int `$value`): true
public set(
int `$year`,
int `$month`,
int `$dayOfMonth` = NULL,
int `$hour` = NULL,
int `$minute` = NULL,
int `$second` = NULL
): true
public setDate(int `$year`, int `$month`, int `$dayOfMonth`): void
public setDateTime(
int `$year`,
int `$month`,
int `$dayOfMonth`,
int `$hour`,
int `$minute`,
?int `$second` = `null`
): void
public setFirstDayOfWeek(int `$dayOfWeek`): true
public setLenient(bool `$lenient`): true
public setMinimalDaysInFirstWeek(int `$days`): true
public setRepeatedWallTimeOption(int `$option`): true
public setSkippedWallTimeOption(int `$option`): true
public setTime(float `$timestamp`): bool
public setTimeZone(IntlTimeZone|DateTimeZone|string|null `$timezone`): bool
public toDateTime(): DateTime|false
}

## Predefined Constants

`IntlCalendar::FIELD_ERA` int

  Calendar field numerically representing an era, for instance `1` for AD and `0` for BC in the Gregorian/Julian calendars and `235` for the Heisei (平成) era in the Japanese calendar. Not all calendars have more than one era.

`IntlCalendar::FIELD_YEAR` int

  Calendar field for the year. This is not unique across eras. If the calendar type has more than one era, generally the minimum value for this field will be `1`.

`IntlCalendar::FIELD_MONTH` int

  Calendar field for the month. The month sequence is zero-based, so January (here used to signify the first month of the calendar; this may be called another name, such as Muharram in the Islamic calendar) is represented by `0`, February by `1`, …, December by `11` and, for calendars that have it, the 13th or leap month by `12`.

`IntlCalendar::FIELD_WEEK_OF_YEAR` int

  Calendar field for the number of the week of the year. This depends on which day of the week is deemed to start the week and the minimal number of days in a week.

`IntlCalendar::FIELD_WEEK_OF_MONTH` int

  Calendar field for the number of the week of the month. This depends on which day of the week is deemed to start the week and the minimal number of days in a week.

`IntlCalendar::FIELD_DATE` int

  Calendar field for the day of the month. The same as `IntlCalendar::FIELD_DAY_OF_MONTH`, which has a clearer name.

`IntlCalendar::FIELD_DAY_OF_YEAR` int

  Calendar field for the day of the year. For the Gregorian calendar, starts with `1` and ends with `365` or `366`.

`IntlCalendar::FIELD_DAY_OF_WEEK` int

  Calendar field for the day of the week. Its values start with `1` (Sunday, see `IntlCalendar::DOW_SUNDAY` and subsequent constants) and the last valid value is 7 (Saturday).

`IntlCalendar::FIELD_DAY_OF_WEEK_IN_MONTH` int

  Given a day of the week (Sunday, Monday, …), this calendar field assigns an ordinal to such a day of the week in a specific month. Thus, if the value of this field is `1` and the value of the day of the week is `2` (Monday), then the set day of the month is the 1st Monday of the month; the maximum value is `5`.

  Additionally, the value `0` and negative values are also allowed. The value `0` encompasses the seven days that occur immediately before the first seven days of a month (which therefore have a ‘day of week in month’ with value `1`). Negative values starts counting from the end of the month – `-1` points to the last occurrence of a day of the week in a month, `-2` to the second last, and so on.

  Unlike `IntlCalendar::FIELD_WEEK_OF_MONTH` and `IntlCalendar::FIELD_WEEK_OF_YEAR`, this value does not depend on IntlCalendar::getFirstDayOfWeek() or on IntlCalendar::getMinimalDaysInFirstWeek(). The first Monday is the first Monday, even if it occurs in a week that belongs to the previous month.

`IntlCalendar::FIELD_AM_PM` int

  Calendar field indicating whether a time is before noon (value `0`, AM) or after (`1`). Midnight is AM, noon is PM.

`IntlCalendar::FIELD_HOUR` int

  Calendar field for the hour, without specifying whether itʼs in the morning or in the afternoon. Valid values are `0` to `11`.

`IntlCalendar::FIELD_HOUR_OF_DAY` int

  Calendar field for the full (24h) hour of the day. Valid values are `0` to `23`.

`IntlCalendar::FIELD_MINUTE` int

  Calendar field for the minutes component of the time.

`IntlCalendar::FIELD_SECOND` int

  Calendar field for the seconds component of the time.

`IntlCalendar::FIELD_MILLISECOND` int

  Calendar field the milliseconds component of the time.

`IntlCalendar::FIELD_ZONE_OFFSET` int

  Calendar field indicating the raw offset of the timezone, in milliseconds. The raw offset is the timezone offset, excluding any offset due to daylight saving time.

`IntlCalendar::FIELD_DST_OFFSET` int

  Calendar field for the daylight saving time offset of the calendarʼs timezone, in milliseconds, if active for calendarʼs time.

`IntlCalendar::FIELD_YEAR_WOY` int

  Calendar field representing the year for week of year purposes.

`IntlCalendar::FIELD_DOW_LOCAL` int

  Calendar field for the localized day of the week. This is a value between `1` and `7`, `1` being used for the day of the week that matches the value returned by IntlCalendar::getFirstDayOfWeek().

`IntlCalendar::FIELD_EXTENDED_YEAR` int

  Calendar field for a year number representation that is continuous across eras. For the Gregorian calendar, the value of this field matches that of `IntlCalendar::FIELD_YEAR` for AD years; a BC year `y` is represented by `-y + 1`.

`IntlCalendar::FIELD_JULIAN_DAY` int

  Calendar field for a modified Julian day number. It is different from a conventional Julian day number in that its transitions occur at local zone midnight rather than at noon UTC. It uniquely identifies a date.

`IntlCalendar::FIELD_MILLISECONDS_IN_DAY` int

  Calendar field encompassing the information in `IntlCalendar::FIELD_HOUR_OF_DAY`, `IntlCalendar::FIELD_MINUTE`, `IntlCalendar::FIELD_SECOND` and `IntlCalendar::FIELD_MILLISECOND`. Range is from the `0` to `24 * 3600 * 1000 - 1`. It is not the amount of milliseconds elapsed in the day since on DST transitions it will have discontinuities analog to those of the wall time.

`IntlCalendar::FIELD_IS_LEAP_MONTH` int

  Calendar field whose value is `1` for indicating a leap month and `0` otherwise.

`IntlCalendar::FIELD_FIELD_COUNT` int

  The total number of fields.

`IntlCalendar::FIELD_DAY_OF_MONTH` int

  Alias for `IntlCalendar::FIELD_DATE`.

`IntlCalendar::DOW_SUNDAY` int

  Sunday.

`IntlCalendar::DOW_MONDAY` int

  Monday.

`IntlCalendar::DOW_TUESDAY` int

  Tuesday.

`IntlCalendar::DOW_WEDNESDAY` int

  Wednesday.

`IntlCalendar::DOW_THURSDAY` int

  Thursday.

`IntlCalendar::DOW_FRIDAY` int

  Friday.

`IntlCalendar::DOW_SATURDAY` int

  Saturday.

`IntlCalendar::DOW_TYPE_WEEKDAY` int

  Output of IntlCalendar::getDayOfWeekType() indicating a day of week is a weekday.

`IntlCalendar::DOW_TYPE_WEEKEND` int

  Output of IntlCalendar::getDayOfWeekType() indicating a day of week belongs to the weekend.

`IntlCalendar::DOW_TYPE_WEEKEND_OFFSET` int

  Output of IntlCalendar::getDayOfWeekType() indicating the weekend begins during the given day of week.

`IntlCalendar::DOW_TYPE_WEEKEND_CEASE` int

  Output of IntlCalendar::getDayOfWeekType() indicating the weekend ends during the given day of week.

`IntlCalendar::WALLTIME_FIRST` int

  Output of IntlCalendar::getSkippedWallTimeOption() indicating that wall times in the skipped range should refer to the same instant as wall times with one hour less and of IntlCalendar::getRepeatedWallTimeOption() indicating the wall times in the repeated range should refer to the instant of the first occurrence of such wall time.

`IntlCalendar::WALLTIME_LAST` int

  Output of IntlCalendar::getSkippedWallTimeOption() indicating that wall times in the skipped range should refer to the same instant as wall times with one hour after and of IntlCalendar::getRepeatedWallTimeOption() indicating the wall times in the repeated range should refer to the instant of the second occurrence of such wall time.

`IntlCalendar::WALLTIME_NEXT_VALID` int

  Output of IntlCalendar::getSkippedWallTimeOption() indicating that wall times in the skipped range should refer to the instant when the daylight saving time transition occurs (begins).

## Changelog

Version | Description
--- | ---
8.4.0 | The class constants are now typed.

## Table of Contents

- IntlCalendar::add — Add a (signed) amount of time to a field
- IntlCalendar::after — Whether this objectʼs time is after that of the passed object
- IntlCalendar::before — Whether this objectʼs time is before that of the passed object
- IntlCalendar::clear — Clear a field or all fields
- IntlCalendar::__construct — Private constructor for disallowing instantiation
- IntlCalendar::createInstance — Create a new IntlCalendar
- IntlCalendar::equals — Compare time of two IntlCalendar objects for equality
- IntlCalendar::fieldDifference — Calculate difference between given time and this objectʼs time
- IntlCalendar::fromDateTime — Create an IntlCalendar from a DateTime object or string
- IntlCalendar::get — Get the value for a field
- IntlCalendar::getActualMaximum — The maximum value for a field, considering the objectʼs current time
- IntlCalendar::getActualMinimum — The minimum value for a field, considering the objectʼs current time
- IntlCalendar::getAvailableLocales — Get array of locales for which there is data
- IntlCalendar::getDayOfWeekType — Tell whether a day is a weekday, weekend or a day that has a transition between the two
- IntlCalendar::getErrorCode — Get last error code on the object
- IntlCalendar::getErrorMessage — Get last error message on the object
- IntlCalendar::getFirstDayOfWeek — Get the first day of the week for the calendarʼs locale
- IntlCalendar::getGreatestMinimum — Get the largest local minimum value for a field
- IntlCalendar::getKeywordValuesForLocale — Get set of locale keyword values
- IntlCalendar::getLeastMaximum — Get the smallest local maximum for a field
- IntlCalendar::getLocale — Get the locale associated with the object
- IntlCalendar::getMaximum — Get the global maximum value for a field
- IntlCalendar::getMinimalDaysInFirstWeek — Get minimal number of days the first week in a year or month can have
- IntlCalendar::getMinimum — Get the global minimum value for a field
- IntlCalendar::getNow — Get number representing the current time
- IntlCalendar::getRepeatedWallTimeOption — Get behavior for handling repeating wall time
- IntlCalendar::getSkippedWallTimeOption — Get behavior for handling skipped wall time
- IntlCalendar::getTime — Get time currently represented by the object
- IntlCalendar::getTimeZone — Get the objectʼs timezone
- IntlCalendar::getType — Get the calendar type
- IntlCalendar::getWeekendTransition — Get time of the day at which weekend begins or ends
- IntlCalendar::inDaylightTime — Whether the objectʼs time is in Daylight Savings Time
- IntlCalendar::isEquivalentTo — Whether another calendar is equal but for a different time
- IntlCalendar::isLenient — Whether date/time interpretation is in lenient mode
- IntlCalendar::isSet — Whether a field is set
- IntlCalendar::isWeekend — Whether a certain date/time is in the weekend
- IntlCalendar::roll — Add value to field without carrying into more significant fields
- IntlCalendar::set — Set a time field or several common fields at once
- IntlCalendar::setDate — Set a date fields
- IntlCalendar::setDateTime — Set a date and time fields
- IntlCalendar::setFirstDayOfWeek — Set the day on which the week is deemed to start
- IntlCalendar::setLenient — Set whether date/time interpretation is to be lenient
- IntlCalendar::setMinimalDaysInFirstWeek — Set minimal number of days the first week in a year or month can have
- IntlCalendar::setRepeatedWallTimeOption — Set behavior for handling repeating wall times at negative timezone offset transitions
- IntlCalendar::setSkippedWallTimeOption — Set behavior for handling skipped wall times at positive timezone offset transitions
- IntlCalendar::setTime — Set the calendar time in milliseconds since the epoch
- IntlCalendar::setTimeZone — Set the timezone used by this calendar
- IntlCalendar::toDateTime — Convert an IntlCalendar into a DateTime object

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