function::ctime(3) [debian man page]

function::ctime

FUNCTION:(3stap)					      Time utility functions						  FUNCTION:(3stap)

NAME

       function::ctime - Convert seconds since epoch into human readable date/time string

SYNOPSIS

	   ctime:string(epochsecs:long)

ARGUMENTS

       epochsecs
	   Number of seconds since epoch (as returned by gettimeofday_s)

DESCRIPTION

       Takes an argument of seconds since the epoch as returned by gettimeofday_s. Returns a string of the form

       "Wed Jun 30 21:49:08 1993"

       The string will always be exactly 24 characters. If the time would be unreasonable far in the past (before what can be represented with a
       32 bit offset in seconds from the epoch) the returned string will be "a long, long time ago...". If the time would be unreasonable far in
       the future the returned string will be "far far in the future..."  (both these strings are also 24 characters wide).

       Note that the epoch (zero) corresponds to

       "Thu Jan 1 00:00:00 1970"

       The earliest full date given by ctime, corresponding to epochsecs -2147483648 is "Fri Dec 13 20:45:52 1901". The latest full date given by
       ctime, corresponding to epochsecs 2147483647 is "Tue Jan 19 03:14:07 2038".

       The abbreviations for the days of the week are 'Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', and 'Sat'. The abbreviations for the months are
       'Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', and 'Dec'.

       Note that the real C library ctime function puts a newline ('
') character at the end of the string that this function does not. Also note
       that since the kernel has no concept of timezones, the returned time is always in GMT.

SystemTap Tapset Reference					     May 2013							  FUNCTION:(3stap)

CONVDATE(1)						    InterNetNews Documentation						       CONVDATE(1)

NAME

       convdate - Convert to/from RFC 5322 dates and seconds since epoch

SYNOPSIS

       convdate [-dhl] [-c | -n | -s] [date ...]

DESCRIPTION

       convdate translates the date/time strings given on the command line, outputting the results one to a line.  The input can either be a date
       in RFC 5322 format (accepting the variations on that format that innd(8) is willing to accept), or the number of seconds since epoch (if -c
       is given).  The output is either ctime(3) results, the number of seconds since epoch, or a Usenet Date: header, depending on the options
       given.

       If date is not given, convdate outputs the current date.

OPTIONS

       -c  Each argument is taken to be the number of seconds since epoch (a time_t) rather than a date.

       -d  Output a valid Usenet Date: header instead of the results of ctime(3) for each date given on the command line.  This is useful for
	   testing the algorithm used to generate Date: headers for local posts.  Normally, the date will be in UTC, but see the -l option.

       -h  Print usage information and exit.

       -l  Only makes sense in combination with -d.  If given, Date: headers generated will use the local time zone instead of UTC.

       -n  Rather than outputting the results of ctime(3) or a Date: header, output each date given as the number of seconds since epoch (a
	   time_t).  This option doesn't make sense in combination with -d.

       -s  Pass each given date to the RFC 5322 date parser and print the results of ctime(3) (or a Date: header if -d is given).  This is the
	   default behavior.

EXAMPLES

       Most of these examples are taken, with modifications from the original man page dating from 1991 and were run in the EST/EDT time zone.

	   % convdate '10 Feb 1991 10:00:00 -0500'
	   Sun Feb 10 10:00:00 1991

	   % convdate '13 Dec 91 12:00 EST' '04 May 1990 0:0:0'
	   Fri Dec 13 12:00:00 1991
	   Fri May  4 00:00:00 1990

	   % convdate -n '10 feb 1991 10:00' '4 May 90 12:00'
	   666198000
	   641880000

	   % convdate -c 666198000
	   Sun Feb 10 10:00:00 1991

       ctime(3) results are in the local time zone.  Compare to:

	   % convdate -dc 666198000
	   Sun, 10 Feb 1991 15:00:00 +0000 (UTC)

	   % env TZ=PST8PDT convdate -dlc 666198000
	   Sun, 10 Feb 1991 07:00:00 -0800 (PST)

	   % env TZ=EST5EDT convdate -dlc 666198000
	   Sun, 10 Feb 1991 10:00:00 -0500 (EST)

       The system library functions generally use the environment variable TZ to determine (or at least override) the local time zone.

HISTORY

       Written by Rich $alz <rsalz@uunet.uu.net>, rewritten and updated by Russ Allbery <rra@stanford.edu> for the -d and -l flags.

       $Id: convdate.pod 8894 2010-01-17 13:04:04Z iulius $

SEE ALSO

       active.times(5).

INN 2.5.2							    2010-02-08							       CONVDATE(1)