DATEFUDGE(1) - man page online | user commands

Pretend the system time is different.

February 13th, 2016
DATEFUDGE(1)                                  Debian                                 DATEFUDGE(1)

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-load‐ ing a small library which modifies the time(2), gettimeofday(2) and clock_gettime(2) sys‐ tem calls.
DATE FORMAT The at_date argument can be given in any format accepted by the date(1) program, for exam‐ ple "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 <>. Modified by Robert Luberda <>.
BUGS There is no attempt to make this change undetectable by the program. In particular, file modification times are not modified.
SEE ALSO date(1),, time(2), gettimeofday(2), clock_gettime(2)
datefudge 1.21 February 13th, 2016 DATEFUDGE(1)
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datefudge(1) referred by
refer to clock_getres(2) | date(1) | gettimeofday(2) | time(2)