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How can I execute a command making it believe that is on a different date than system one?

For instance, if I have this script:

#!/usr/bin/env bash    
date +"%B %d, %Y"

It prints the actual date: march 13, 2014

But I would like it to print a different date, on the future or past, without changing the system date.

If I wasn't clear enough, I want a command line tool like this Windows GUI tool.

I do not want to use a different script (it was just an example).
I do not want to set a cronjob.
I do not want to change my general system date.
Only change the date that apply to the command to run.

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I deleted a duplicate answer that you accepted; you might want to accept the original instead –  Michael Mrozek Mar 17 at 14:31
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1 Answer

up vote 11 down vote accepted

Using the faketime software could be a solution

sudo apt-get install faketime
faketime '2006-09-20' wine Example.exe


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that sounds promising, thank you! haven't found that one. I'll give it a try! –  Udo Gröbner Jul 11 '13 at 20:27
it did the trick on wine? i tested just on native binaries; cheers –  nwildner Jul 12 '13 at 13:19
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