Creates a #GTimeZone 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 %NULL).
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, or 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).
g_time_zone_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 %NULL 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.
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
Creates a #GTimeZone 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 %NULL).
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, or 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).
g_time_zone_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 %NULL 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 g_time_zone_unref() when you are done with it.