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NetBSD 6.1.5 - man page for tm (netbsd section 3)

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TM(3)				   BSD Library Functions Manual 			    TM(3)

NAME
     tm -- time structure

SYNOPSIS
     #include <time.h>

DESCRIPTION
     The <time.h> header defines the tm structure that contains calendar dates and time broken
     down into components.  The following standards-compliant fields are present:

	   Type    Field      Represents		     Range
	   int	   tm_sec     Seconds			     [0, 61]
	   int	   tm_min     Minutes			     [0, 59]
	   int	   tm_hour    Hours since midnight	     [0, 23]
	   int	   tm_mday    Day of the month		     [1, 31]
	   int	   tm_mon     Months since January	     [0, 11]
	   int	   tm_year    Years since 1900
	   int	   tm_wday    Days since Sunday 	     [0, 6]
	   int	   tm_yday    Days since January 1	     [0, 365]
	   int	   tm_isdt    Positive if daylight savings   >= 0

     The tm structure is used by various common library routines such as mktime(3), localtime(3),
     and strptime(3).  All fields described above are defined in the IEEE Std 1003.1-2008
     (``POSIX.1'') standard.

   NetBSD Extensions
     In addition, the following NetBSD-specific fields are available:

	   Type 	    Field      Represents
	   int		    tm_gmtoff  Offset from UTC in seconds
	   __aconst char    tm_zone    Timezone abbreviation

     The tm_zone and 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 cre-
     ated.  There is no guarantee that these fields will continue to exist in this form in future
     releases of NetBSD.

     The tm_gmtoff field denotes the offset (in seconds) of the time represented from UTC, with
     positive values indicating east of the Prime Meridian.  The tm_zone field will become
     invalid and point to freed storage if the corresponding struct tm was returned by
     localtime_rz(3) and the const timezone_t tz argument has been freed by tzfree(3).

SEE ALSO
     asctime(3), offtime(3), timeval(3), wcsftime(3)

STANDARDS
     The tm structure conforms to IEEE Std 1003.1-2008 (``POSIX.1'') with respect to the
     described standard structure members.

BSD					  April 14, 2011				      BSD
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