GLib.TimeZone

Fields

None

Methods

class new (identifier)
class new_local ()
class new_offset (seconds)
class new_utc ()
  adjust_time (type, time_)
  find_interval (type, time_)
  get_abbreviation (interval)
  get_identifier ()
  get_offset (interval)
  is_dst (interval)
  ref ()
  unref ()

Details

class GLib.TimeZone

GLib.TimeZone is an opaque structure whose members cannot be accessed directly.

New in version 2.26.

classmethod new(identifier)[source]
Parameters:identifier (str or None) – a timezone identifier
Returns:the requested timezone
Return type:GLib.TimeZone

Creates a GLib.TimeZone corresponding to identifier.

identifier can either be an RFC3339/ISO 8601 time offset or something that would pass as a valid value for the TZ environment variable (including None).

In Windows, identifier can also be the unlocalized name of a time zone for standard time, for example “Pacific Standard Time”.

Valid RFC3339 time offsets are "Z" (for UTC) or "±hh:mm". ISO 8601 additionally specifies "±hhmm" and "±hh". Offsets are time values to be added to Coordinated Universal Time (UTC) to get the local time.

In UNIX, the TZ environment variable typically corresponds to the name of a file in the zoneinfo database, an absolute path to a file somewhere else, or a string in “std offset [dst [offset],start[/time],end[/time]]” (POSIX) format. There are no spaces in the specification. The name of standard and daylight savings time zone must be three or more alphabetic characters. Offsets are time values to be added to local time to get Coordinated Universal Time (UTC) and should be "[±]hh[[:]mm[:ss]]". Dates are either "Jn" (Julian day with n between 1 and 365, leap years not counted), "n" (zero-based Julian day with n between 0 and 365) or "Mm.w.d" (day d (0 <= d <= 6) of week w (1 <= w <= 5) of month m (1 <= m <= 12), day 0 is a Sunday). Times are in local wall clock time, the default is 02:00:00.

In Windows, the “tzn[+|–]hh[:mm[:ss]][dzn]” format is used, but also accepts POSIX format. The Windows format uses US rules for all time zones; daylight savings time is 60 minutes behind the standard time with date and time of change taken from Pacific Standard Time. Offsets are time values to be added to the local time to get Coordinated Universal Time (UTC).

GLib.TimeZone.new_local() calls this function with the value of the TZ environment variable. This function itself is independent of the value of TZ, but if identifier is None then /etc/localtime will be consulted to discover the correct time zone on UNIX and the registry will be consulted or GetTimeZoneInformation() will be used to get the local time zone on Windows.

If intervals are not available, only time zone rules from TZ environment variable or other means, then they will be computed from year 1900 to 2037. If the maximum year for the rules is available and it is greater than 2037, then it will followed instead.

See RFC3339 §5.6 for a precise definition of valid RFC3339 time offsets (the time-offset expansion) and ISO 8601 for the full list of valid time offsets. See The GNU C Library manual for an explanation of the possible values of the TZ environment variable. See Microsoft Time Zone Index Values for the list of time zones on Windows.

You should release the return value by calling GLib.TimeZone.unref() when you are done with it.

New in version 2.26.

classmethod new_local()[source]
Returns:the local timezone
Return type:GLib.TimeZone

Creates a GLib.TimeZone corresponding to local time. The local time zone may change between invocations to this function; for example, if the system administrator changes it.

This is equivalent to calling GLib.TimeZone.new() with the value of the TZ environment variable (including the possibility of None).

You should release the return value by calling GLib.TimeZone.unref() when you are done with it.

New in version 2.26.

classmethod new_offset(seconds)[source]
Parameters:seconds (int) – offset to UTC, in seconds
Returns:a timezone at the given offset from UTC
Return type:GLib.TimeZone

Creates a GLib.TimeZone corresponding to the given constant offset from UTC, in seconds.

This is equivalent to calling GLib.TimeZone.new() with a string in the form [+|-]hh[:mm[:ss]].

New in version 2.58.

classmethod new_utc()[source]
Returns:the universal timezone
Return type:GLib.TimeZone

Creates a GLib.TimeZone corresponding to UTC.

This is equivalent to calling GLib.TimeZone.new() with a value like “Z”, “UTC”, “+00”, etc.

You should release the return value by calling GLib.TimeZone.unref() when you are done with it.

New in version 2.26.

adjust_time(type, time_)[source]
Parameters:
Returns:

the interval containing time_, never -1
Return type:

int

Finds an interval within self that corresponds to the given time_, possibly adjusting time_ if required to fit into an interval. The meaning of time_ depends on type.

This function is similar to GLib.TimeZone.find_interval(), with the difference that it always succeeds (by making the adjustments described below).

In any of the cases where GLib.TimeZone.find_interval() succeeds then this function returns the same value, without modifying time_.

This function may, however, modify time_ in order to deal with non-existent times. If the non-existent local time_ of 02:30 were requested on March 14th 2010 in Toronto then this function would adjust time_ to be 03:00 and return the interval containing the adjusted time.

New in version 2.26.

find_interval(type, time_)[source]
Parameters:
Returns:

the interval containing time_, or -1 in case of failure
Return type:

int

Finds an interval within self that corresponds to the given time_. The meaning of time_ depends on type.

If type is GLib.TimeType.UNIVERSAL then this function will always succeed (since universal time is monotonic and continuous).

Otherwise time_ is treated as local time. The distinction between GLib.TimeType.STANDARD and GLib.TimeType.DAYLIGHT is ignored except in the case that the given time_ is ambiguous. In Toronto, for example, 01:30 on November 7th 2010 occurred twice (once inside of daylight savings time and the next, an hour later, outside of daylight savings time). In this case, the different value of type would result in a different interval being returned.

It is still possible for this function to fail. In Toronto, for example, 02:00 on March 14th 2010 does not exist (due to the leap forward to begin daylight savings time). -1 is returned in that case.

New in version 2.26.

get_abbreviation(interval)[source]
Parameters:interval (int) – an interval within the timezone
Returns:the time zone abbreviation, which belongs to self
Return type:str

Determines the time zone abbreviation to be used during a particular interval of time in the time zone self.

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.

New in version 2.26.

get_identifier()[source]
Returns:identifier for this timezone
Return type:str

Get the identifier of this GLib.TimeZone, as passed to GLib.TimeZone.new(). If the identifier passed at construction time was not recognised, UTC will be returned. If it was None, the identifier of the local timezone at construction time will be returned.

The identifier will be returned in the same format as provided at construction time: if provided as a time offset, that will be returned by this function.

New in version 2.58.

get_offset(interval)[source]
Parameters:interval (int) – an interval within the timezone
Returns:the number of seconds that should be added to UTC to get the local time in self
Return type:int

Determines the offset to UTC in effect during a particular interval of time in the time zone self.

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

New in version 2.26.

is_dst(interval)[source]
Parameters:interval (int) – an interval within the timezone
Returns:True if daylight savings time is in effect
Return type:bool

Determines if daylight savings time is in effect during a particular interval of time in the time zone self.

New in version 2.26.

ref()[source]
Returns:a new reference to self.
Return type:GLib.TimeZone

Increases the reference count on self.

New in version 2.26.

unref()[source]

Decreases the reference count on self.

New in version 2.26.