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convdate
Langue: en
Version: 2008-04-06 (fedora - 04/07/09)
Section: 1 (Commandes utilisateur)
NAME
convdate - Convert time/date strings and numbersSYNOPSIS
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 some format that parsedate(3) can parse 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.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 parsedate(3) and print the results of ctime(3) (or a Date: header if -d is given). This is the default behavior.
EXAMPLES
Note that relative times or times with partial information use the current time to fill in the rest of the date, so dates like ``12pm'' are taken to be 12pm of the day when convdate is run. This is a property of parsedate(3); see the man page for more information. Most of these examples are from the original man page dating from 1991 and were run in the -0400 time zone.% convdate 'feb 10 10am' Sun Feb 10 10:00:00 1991
% convdate 12pm 5/4/90 Fri Dec 13 00:00:00 1991 Fri May 4 00:00:00 1990
Note that 12pm and 5/4/90 are two *separate* arguments and therefore result in two results. Note also that a date with no time is taken to be at midnight.
% convdate -n 'feb 10 10am' '12pm 5/4/90' 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.1 8330 2009-02-19 20:41:04Z iulius $
SEE ALSO
parsedate(3).Contenus ©2006-2024 Benjamin Poulain
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