Copyright (c) 2011 Jukka Ruohonen <jruohonen@iki.fi>
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.Dd April 12, 2011 .Dt TM 3 .Os .Sh NAME .Nm tm .Nd time structure .Sh SYNOPSIS n time.h .Sh DESCRIPTION The n time.h header defines the following structure: d -literal -offset indent struct tm { int tm_sec; int tm_min; int tm_hour; int tm_mday; int tm_mon; int tm_year; int tm_wday; int tm_yday; int tm_isdst; long tm_gmtoff; __aconst char *tm_zone; }; .Ed
p The members are: l -column -offset indent \ "Member " "Months since January 1 " "Range " t Sy Member Ta Sy Represents Ta Sy Range t Va tm_sec Ta Seconds Ta [0, 61] t Va tm_min Ta Minutes Ta [0, 59] t Va tm_hour Ta Hours since midnight Ta [0, 23] t Va tm_mday Ta Day of the month Ta [1, 31] t Va tm_mon Ta Months since January Ta [0, 11] t Va tm_year Ta Years since 1900 Ta t Va tm_wday Ta Days since Sunday Ta [0, 6] t Va tm_yday Ta Days since January 1 Ta [0, 365] t Va tm_isdt Ta Positive if daylight savings Ta >= 0 t Va tm_gmtoff Ta Offset from UTC in seconds Ta t Va tm_zone Ta Timezone abbreviation .El
p The .Vt tm structure is used by various common library routines such as .Xr mktime 3 , .Xr localtime 3 , and .Xr strptime 3 . All except .Va tm_gmtoff and .Va tm_zone are defined in .St -p1003.1-2008 . .Ss NetBSD Extensions The .Va tm_zone and .Va tm_gmtoff fields exist, and are filled in by applicable library routines, only if arrangements to do so were made when the library containing these functions was created. There is no guarantee that these fields will continue to exist in this form in future releases of . Nx .
p The .Fa tm_gmtoff field denotes the offset (in seconds) of the time represented from UTC, with positive values indicating east of the Prime Meridian. The .Vt tm_zone field will become invalid and point to freed storage if the corresponding .Va "struct tm" was returned by .Xr localtime_rz 3 and the .Ft "const timezone_t" .Fa tz argument has been freed by .Xr tzfree 3 . .Sh SEE ALSO .Xr timeval 3 .Sh STANDARDS The .Vt tm structure conforms to .St -p1003.1-2008 .