Beyondo
If you want to alter your system date just for a short period of time then Beyondo is the tool you want.
Alters your system date for a period of time
Presets: choose from a range of user defined or recent (previously used) dates
Quickset options: choose from a range of specified values (f.i. date minus 60 days)
Possibility for a Timed Exit: ‘autoquit’ in 1 to 10 minutes
Can automatically change the system date on execution
Safe Exiting: Beyondo will always restore the original date before closing
Runs on Windows 95/98/ME/NT4/2000/2003/XP