Copyright (c) 2011 Jukka Ruohonen <jruohonen@iki.fi>
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.Dd April 14, 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 .Vt tm structure that contains calendar dates and time broken down into components. The following standards-compliant fields are present: l -column -offset indent \ "Type" "Field " "Months since January 1 " "Range " t Sy Type Ta Sy Field Ta Sy Represents Ta Sy Range t Vt int Ta Va tm_sec Ta Seconds Ta [0, 60] t Vt int Ta Va tm_min Ta Minutes Ta [0, 59] t Vt int Ta Va tm_hour Ta Hours since midnight Ta [0, 23] t Vt int Ta Va tm_mday Ta Day of the month Ta [1, 31] t Vt int Ta Va tm_mon Ta Months since January Ta [0, 11] t Vt int Ta Va tm_year Ta Years since 1900 Ta t Vt int Ta Va tm_wday Ta Days since Sunday Ta [0, 6] t Vt int Ta Va tm_yday Ta Days since January 1 Ta [0, 365] t Vt int Ta Va tm_isdt Ta Positive if daylight savings Ta >= 0 .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 fields described above are defined in the .St -p1003.1-2008 standard. .Ss NetBSD Extensions In addition, the following NetBSD-specific fields are available: l -column -offset indent \ "Type " "Field " "Months since January 1" t Sy Type Ta Sy Field Ta Sy Represents t Vt long Ta Va tm_gmtoff Ta Offset from UTC in seconds t Vt char Ta Va tm_zone Ta Timezone abbreviation .El
p 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 asctime 3 , .Xr offtime 3 , .Xr timeval 3 , .Xr wcsftime 3 .Sh STANDARDS The .Vt tm structure conforms to .St -p1003.1-2008 with respect to the described standard structure members.