Package libfaketime

Manipulate system time per process for testing purposes

http://www.code-wizards.com/projects/libfaketime/

libfaketime intercepts various system calls which programs use to
retrieve the current date and time. It can then report faked dates and
times (as specified by you, the user) to these programs. This means you
can modify the system time a program sees without having to change the
time system- wide.

General Commands
Command Description
faketime manipulate the system time for a given command