datefudge(1)

1DATEFUDGE(1)                        Debian                        DATEFUDGE(1)
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NAME

6       datefudge - pretend the system time is different
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SYNOPSIS

9       datefudge [-s|--static] at_date program [arguments ...]
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DESCRIPTION

12       datefudge is a small utility that pretends that the system time is dif‐
13       ferent by pre-loading a small library which modifies the time(2),  get‐
14       timeofday(2) and clock_gettime(2) system calls.
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DATE FORMAT

17       The at_date argument can be given in any format accepted by the date(1)
18       program, for example "2007-04-01 12:21" or "yesterday", or  "next  Fri‐
19       day".
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OPTIONS

22       --static, -s
23              Mark  the  date  as  a `static' one.  The above mentioned system
24              calls will always return the date given in the at_date argument,
25              regardless of time passing. See EXAMPLES
26               below.
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28       --help, -h
29              Print short usage information and exit.
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31       --version, -v
32              Print version information and exit.
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EXAMPLES

35   Basic examples:
36       $ datefudge "2007-04-01 10:23" date -R
37       Sun, 01 Apr 2007 10:23:00 +0200
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39       $ datefudge "1 May 2007" date -R
40       Tue, 01 May 2007 00:00:00 +0200
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42       $ datefudge "2 weeks ago" date -R
43       Wed, 16 Jan 2008 13:32:12 +0100
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45   Non-static vs. static example:
46       $ datefudge "2007-04-01 10:23" sh -c "sleep 3; date -R"
47       Sun, 01 Apr 2007 10:23:03 +0200
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49       $ datefudge --static "2007-04-01 10:23" sh -c "sleep 3; date -R"
50       Sun, 01 Apr 2007 10:23:00 +0200
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AUTHOR

53       Written  by  Matthias  Urlichs  <smurf@noris.de>.  Modified  by  Robert
54       Luberda <robert@debian.org>.
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BUGS

57       There is no attempt to make this change undetectable  by  the  program.
58       In particular, file modification times are not modified.
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60       On  systems  using 32-bit representation of time, datefudge is affected
61       by the year 2038 problem, which might cause dates to be wrapped around,
62       for instance:
63       $ TZ=UTC datefudge "2038-01-19 03:14:07" sh -c "sleep 1; date -R"
64       Fri Dec 13 20:45:53 UTC 1901
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COPYRIGHT

67       Copyright © 2003 by Matthias Urlichs.
68       Copyright © 2008-2017 by Robert Luberda.
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70       There  is  NO  warranty;  not even for MERCHANTABILITY or FITNESS FOR A
71       PARTICULAR PURPOSE.  You may redistribute copies of datefudge under the
72       terms of the GNU General Public License.
73       For more information about these matters, see the file named COPYING.
74