NAME

       datefudge - pretend the system time is different

SYNOPSIS

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

DESCRIPTION

       datefudge  is  a  small  utility  that  pretends that the system time is different by pre-
       loading a small library which modifies the time(2), gettimeofday(2)  and  clock_gettime(2)
       system calls.

DATE FORMAT

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

OPTIONS

       --static, -s
              Mark the date as a `static' one.  The above  mentioned  system  calls  will  always
              return  the  date  given  in  the at_date argument, regardless of time passing. See
              EXAMPLES
               below.

       --help, -h
              Print short usage information and exit.

       --version, -v
              Print version information and exit.

EXAMPLES

   Basic examples:
       $ datefudge "2007-04-01 10:23" date -R
       Sun, 01 Apr 2007 10:23:00 +0200

       $ datefudge "1 May 2007" date -R
       Tue, 01 May 2007 00:00:00 +0200

       $ datefudge "2 weeks ago" date -R
       Wed, 16 Jan 2008 13:32:12 +0100

   Non-static vs. static example:
       $ datefudge "2007-04-01 10:23" sh -c "sleep 3; date -R"
       Sun, 01 Apr 2007 10:23:03 +0200

       $ datefudge --static "2007-04-01 10:23" sh -c "sleep 3; date -R"
       Sun, 01 Apr 2007 10:23:00 +0200

AUTHOR

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

BUGS

       There  is no attempt to make this change undetectable by the program.  In particular, file
       modification times are not modified.

       On systems using 32-bit representation of time, datefudge is affected  by  the  year  2038
       problem, which might cause dates to be wrapped around, for instance:
       $ TZ=UTC datefudge "2038-01-19 03:14:07" sh -c "sleep 1; date -R"
       Fri Dec 13 20:45:53 UTC 1901

COPYRIGHT

       Copyright © 2003 by Matthias Urlichs.
       Copyright © 2008-2017 by Robert Luberda.

       There  is  NO  warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
       You may redistribute copies of datefudge  under  the  terms  of  the  GNU  General  Public
       License.
       For more information about these matters, see the file named COPYING.

SEE ALSO

       date(1), ld.so(1), time(2), gettimeofday(2), clock_gettime(2)