Memory-managed wrapper type.

A convenience alias for Nothing :: Maybe DateTime.

Creates a copy of datetime and adds the specified timespan to the copy.

Since: 2.26

Creates a copy of datetime and adds the specified number of days to the copy. Add negative values to subtract days.

Since: 2.26

Creates a new DateTime adding the specified values to the current date and time in datetime. Add negative values to subtract.

Since: 2.26

Creates a copy of datetime and adds the specified number of hours. Add negative values to subtract hours.

Since: 2.26

Creates a copy of datetime adding the specified number of minutes. Add negative values to subtract minutes.

Since: 2.26

Creates a copy of datetime and adds the specified number of months to the copy. Add negative values to subtract months.

The day of the month of the resulting DateTime is clamped to the number of days in the updated calendar month. For example, if adding 1 month to 31st January 2018, the result would be 28th February 2018. In 2020 (a leap year), the result would be 29th February.

Since: 2.26

Creates a copy of datetime and adds the specified number of seconds. Add negative values to subtract seconds.

Since: 2.26

Creates a copy of datetime and adds the specified number of weeks to the copy. Add negative values to subtract weeks.

Since: 2.26

Creates a copy of datetime and adds the specified number of years to the copy. Add negative values to subtract years.

As with dateTimeAddMonths, if the resulting date would be 29th February on a non-leap year, the day will be clamped to 28th February.

Since: 2.26

A comparison function for GDateTimes that is suitable as a CompareFunc. Both GDateTimes must be non-Nothing.

Since: 2.26

Calculates the difference in time between end and begin. The GTimeSpan that is returned is effectively end - begin (ie: positive if the first parameter is larger).

Since: 2.26

Checks to see if dt1 and dt2 are equal.

Equal here means that they represent the same moment after converting them to the same time zone.

Since: 2.26

Creates a newly allocated string representing the requested format.

The format strings understood by this function are a subset of the strftime() format language as specified by C99. The %D, %U and %W conversions are not supported, nor is the 'E' modifier. The GNU extensions %k, %l, %s and %P are supported, however, as are the '0', '_' and '-' modifiers.

In contrast to strftime(), this function always produces a UTF-8 string, regardless of the current locale. Note that the rendering of many formats is locale-dependent and may not match the strftime() output exactly.

The following format specifiers are supported:

• %a: the abbreviated weekday name according to the current locale
• %A: the full weekday name according to the current locale
• %b: the abbreviated month name according to the current locale
• %B: the full month name according to the current locale
• %c: the preferred date and time representation for the current locale
• %C: the century number (year/100) as a 2-digit integer (00-99)
• %d: the day of the month as a decimal number (range 01 to 31)
• %e: the day of the month as a decimal number (range 1 to 31)
• %F: equivalent to %Y-%m-%d (the ISO 8601 date format)
• %g: the last two digits of the ISO 8601 week-based year as a decimal number (00-99). This works well with %V and %u.
• %G: the ISO 8601 week-based year as a decimal number. This works well with %V and %u.
• %h: equivalent to %b
• %H: the hour as a decimal number using a 24-hour clock (range 00 to 23)
• %I: the hour as a decimal number using a 12-hour clock (range 01 to 12)
• %j: the day of the year as a decimal number (range 001 to 366)
• %k: the hour (24-hour clock) as a decimal number (range 0 to 23); single digits are preceded by a blank
• %l: the hour (12-hour clock) as a decimal number (range 1 to 12); single digits are preceded by a blank
• %m: the month as a decimal number (range 01 to 12)
• %M: the minute as a decimal number (range 00 to 59)
• %p: either "AM" or "PM" according to the given time value, or the corresponding strings for the current locale. Noon is treated as "PM" and midnight as "AM".
• %P: like %p but lowercase: "am" or "pm" or a corresponding string for the current locale
• %r: the time in a.m. or p.m. notation
• %R: the time in 24-hour notation (%H:%M)
• %s: the number of seconds since the Epoch, that is, since 1970-01-01 00:00:00 UTC
• %S: the second as a decimal number (range 00 to 60)
• %t: a tab character
• %T: the time in 24-hour notation with seconds (%H:%M:%S)
• %u: the ISO 8601 standard day of the week as a decimal, range 1 to 7, Monday being 1. This works well with %G and %V.
• %V: the ISO 8601 standard week number of the current year as a decimal number, range 01 to 53, where week 1 is the first week that has at least 4 days in the new year. See dateTimeGetWeekOfYear. This works well with %G and %u.
• %w: the day of the week as a decimal, range 0 to 6, Sunday being 0. This is not the ISO 8601 standard format -- use %u instead.
• %x: the preferred date representation for the current locale without the time
• %X: the preferred time representation for the current locale without the date
• %y: the year as a decimal number without the century
• %Y: the year as a decimal number including the century
• %z: the time zone as an offset from UTC (+hhmm)
• %:z: the time zone as an offset from UTC (+hh:mm). This is a gnulib strftime() extension. Since: 2.38
• %::z: the time zone as an offset from UTC (+hh:mm:ss). This is a gnulib strftime() extension. Since: 2.38
• %:::z: the time zone as an offset from UTC, with : to necessary precision (e.g., -04, +05:30). This is a gnulib strftime() extension. Since: 2.38
• %Z: the time zone or name or abbreviation
• %%: a literal % character

Some conversion specifications can be modified by preceding the conversion specifier by one or more modifier characters. The following modifiers are supported for many of the numeric conversions:

• O: Use alternative numeric symbols, if the current locale supports those.
• _: Pad a numeric result with spaces. This overrides the default padding for the specifier.
• -: Do not pad a numeric result. This overrides the default padding for the specifier.
• 0: Pad a numeric result with zeros. This overrides the default padding for the specifier.

Additionally, when O is used with B, b, or h, it produces the alternative form of a month name. The alternative form should be used when the month name is used without a day number (e.g., standalone). It is required in some languages (Baltic, Slavic, Greek, and more) due to their grammatical rules. For other languages there is no difference. %OB is a GNU and BSD strftime() extension expected to be added to the future POSIX specification, %Ob and %Oh are GNU strftime() extensions. Since: 2.56

Since: 2.26

Retrieves the day of the month represented by datetime in the gregorian calendar.

Since: 2.26

Retrieves the ISO 8601 day of the week on which datetime falls (1 is Monday, 2 is Tuesday... 7 is Sunday).

Since: 2.26

Retrieves the day of the year represented by datetime in the Gregorian calendar.

Since: 2.26

Retrieves the hour of the day represented by datetime

Since: 2.26

Retrieves the microsecond of the date represented by datetime

Since: 2.26

Retrieves the minute of the hour represented by datetime

Since: 2.26

Retrieves the month of the year represented by datetime in the Gregorian calendar.

Since: 2.26

Retrieves the second of the minute represented by datetime

Since: 2.26

Retrieves the number of seconds since the start of the last minute, including the fractional part.

Since: 2.26

Get the time zone for this datetime.

Since: 2.58

Determines the time zone abbreviation to be used at the time and in the time zone of datetime.

For example, in Toronto this is currently "EST" during the winter months and "EDT" during the summer months when daylight savings time is in effect.

Since: 2.26

Determines the offset to UTC in effect at the time and in the time zone of datetime.

The offset is the number of microseconds that you add to UTC time to arrive at local time for the time zone (ie: negative numbers for time zones west of GMT, positive numbers for east).

If datetime represents UTC time, then the offset is always zero.

Since: 2.26

Returns the ISO 8601 week-numbering year in which the week containing datetime falls.

This function, taken together with dateTimeGetWeekOfYear and dateTimeGetDayOfWeek can be used to determine the full ISO week date on which datetime falls.

This is usually equal to the normal Gregorian year (as returned by dateTimeGetYear), except as detailed below:

For Thursday, the week-numbering year is always equal to the usual calendar year. For other days, the number is such that every day within a complete week (Monday to Sunday) is contained within the same week-numbering year.

For Monday, Tuesday and Wednesday occurring near the end of the year, this may mean that the week-numbering year is one greater than the calendar year (so that these days have the same week-numbering year as the Thursday occurring early in the next year).

For Friday, Saturday and Sunday occurring near the start of the year, this may mean that the week-numbering year is one less than the calendar year (so that these days have the same week-numbering year as the Thursday occurring late in the previous year).

An equivalent description is that the week-numbering year is equal to the calendar year containing the majority of the days in the current week (Monday to Sunday).

Note that January 1 0001 in the proleptic Gregorian calendar is a Monday, so this function never returns 0.

Since: 2.26

Returns the ISO 8601 week number for the week containing datetime. The ISO 8601 week number is the same for every day of the week (from Moday through Sunday). That can produce some unusual results (described below).

The first week of the year is week 1. This is the week that contains the first Thursday of the year. Equivalently, this is the first week that has more than 4 of its days falling within the calendar year.

The value 0 is never returned by this function. Days contained within a year but occurring before the first ISO 8601 week of that year are considered as being contained in the last week of the previous year. Similarly, the final days of a calendar year may be considered as being part of the first ISO 8601 week of the next year if 4 or more days of that week are contained within the new year.

Since: 2.26

Retrieves the year represented by datetime in the Gregorian calendar.

Since: 2.26

Retrieves the Gregorian day, month, and year of a given DateTime.

Since: 2.26

Hashes datetime into a guint, suitable for use within HashTable.

Since: 2.26

Determines if daylight savings time is in effect at the time and in the time zone of datetime.

Since: 2.26

Creates a new DateTime corresponding to the given date and time in the time zone tz.

The year must be between 1 and 9999, month between 1 and 12 and day between 1 and 28, 29, 30 or 31 depending on the month and the year.

hour must be between 0 and 23 and minute must be between 0 and 59.

seconds must be at least 0.0 and must be strictly less than 60.0. It will be rounded down to the nearest microsecond.

If the given time is not representable in the given time zone (for example, 02:30 on March 14th 2010 in Toronto, due to daylight savings time) then the time will be rounded up to the nearest existing time (in this case, 03:00). If this matters to you then you should verify the return value for containing the same as the numbers you gave.

In the case that the given time is ambiguous in the given time zone (for example, 01:30 on November 7th 2010 in Toronto, due to daylight savings time) then the time falling within standard (ie: non-daylight) time is taken.

It not considered a programmer error for the values to this function to be out of range, but in the case that they are, the function will return Nothing.

You should release the return value by calling dateTimeUnref when you are done with it.

Since: 2.26

Creates a DateTime corresponding to the given ISO 8601 formatted string text. ISO 8601 strings of the form <date><sep><time><tz> are supported.

<sep> is the separator and can be either 'T', 't' or ' '.

<date> is in the form:

• YYYY-MM-DD - Year/month/day, e.g. 2016-08-24.
• YYYYMMDD - Same as above without dividers.
• YYYY-DDD - Ordinal day where DDD is from 001 to 366, e.g. 2016-237.
• YYYYDDD - Same as above without dividers.
• YYYY-Www-D - Week day where ww is from 01 to 52 and D from 1-7, e.g. 2016-W34-3.
• YYYYWwwD - Same as above without dividers.

<time> is in the form:

• hh:mm:ss(.sss) - Hours, minutes, seconds (subseconds), e.g. 22:10:42.123.
• hhmmss(.sss) - Same as above without dividers.

<tz> is an optional timezone suffix of the form:

• Z - UTC.
• +hh:mm or -hh:mm - Offset from UTC in hours and minutes, e.g. +12:00.
• +hh or -hh - Offset from UTC in hours, e.g. +12.

If the timezone is not provided in text it must be provided in defaultTz (this field is otherwise ignored).

This call can fail (returning Nothing) if text is not a valid ISO 8601 formatted string.

You should release the return value by calling dateTimeUnref when you are done with it.

Since: 2.56

Creates a DateTime corresponding to the given TimeVal tv in the local time zone.

The time contained in a TimeVal is always stored in the form of seconds elapsed since 1970-01-01 00:00:00 UTC, regardless of the local time offset.

This call can fail (returning Nothing) if tv represents a time outside of the supported range of DateTime.

You should release the return value by calling dateTimeUnref when you are done with it.

Since: 2.26

Creates a DateTime corresponding to the given TimeVal tv in UTC.

The time contained in a TimeVal is always stored in the form of seconds elapsed since 1970-01-01 00:00:00 UTC.

This call can fail (returning Nothing) if tv represents a time outside of the supported range of DateTime.

You should release the return value by calling dateTimeUnref when you are done with it.

Since: 2.26

Creates a DateTime corresponding to the given Unix time t in the local time zone.

Unix time is the number of seconds that have elapsed since 1970-01-01 00:00:00 UTC, regardless of the local time offset.

This call can fail (returning Nothing) if t represents a time outside of the supported range of DateTime.

You should release the return value by calling dateTimeUnref when you are done with it.

Since: 2.26

Creates a DateTime corresponding to the given Unix time t in UTC.

Unix time is the number of seconds that have elapsed since 1970-01-01 00:00:00 UTC.

This call can fail (returning Nothing) if t represents a time outside of the supported range of DateTime.

You should release the return value by calling dateTimeUnref when you are done with it.

Since: 2.26

Creates a new DateTime corresponding to the given date and time in the local time zone.

This call is equivalent to calling dateTimeNew with the time zone returned by timeZoneNewLocal.

Since: 2.26

Creates a DateTime corresponding to this exact instant in the given time zone tz. The time is as accurate as the system allows, to a maximum accuracy of 1 microsecond.

This function will always succeed unless the system clock is set to truly insane values (or unless GLib is still being used after the year 9999).

You should release the return value by calling dateTimeUnref when you are done with it.

Since: 2.26

Creates a DateTime corresponding to this exact instant in the local time zone.

This is equivalent to calling dateTimeNewNow with the time zone returned by timeZoneNewLocal.

Since: 2.26

Creates a DateTime corresponding to this exact instant in UTC.

This is equivalent to calling dateTimeNewNow with the time zone returned by timeZoneNewUtc.

Since: 2.26

Creates a new DateTime corresponding to the given date and time in UTC.

This call is equivalent to calling dateTimeNew with the time zone returned by timeZoneNewUtc.

Since: 2.26

Atomically increments the reference count of datetime by one.

Since: 2.26

Creates a new DateTime corresponding to the same instant in time as datetime, but in the local time zone.

This call is equivalent to calling dateTimeToTimezone with the time zone returned by timeZoneNewLocal.

Since: 2.26

Stores the instant in time that datetime represents into tv.

The time contained in a TimeVal is always stored in the form of seconds elapsed since 1970-01-01 00:00:00 UTC, regardless of the time zone associated with datetime.

On systems where 'long' is 32bit (ie: all 32bit systems and all Windows systems), a TimeVal is incapable of storing the entire range of values that DateTime is capable of expressing. On those systems, this function returns False to indicate that the time is out of range.

On systems where 'long' is 64bit, this function never fails.

Since: 2.26

Create a new DateTime corresponding to the same instant in time as datetime, but in the time zone tz.

This call can fail in the case that the time goes out of bounds. For example, converting 0001-01-01 00:00:00 UTC to a time zone west of Greenwich will fail (due to the year 0 being out of range).

You should release the return value by calling dateTimeUnref when you are done with it.

Since: 2.26

Gives the Unix time corresponding to datetime, rounding down to the nearest second.

Unix time is the number of seconds that have elapsed since 1970-01-01 00:00:00 UTC, regardless of the time zone associated with datetime.

Since: 2.26

Creates a new DateTime corresponding to the same instant in time as datetime, but in UTC.

This call is equivalent to calling dateTimeToTimezone with the time zone returned by timeZoneNewUtc.

Since: 2.26

Atomically decrements the reference count of datetime by one.

When the reference count reaches zero, the resources allocated by datetime are freed

Since: 2.26