Could somebody recommend a small utility to calculate the number of days between two dates?

[scar]

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Johnneylee Rollins @ 01/31/2010 11:06 AM:
> On Sun, Jan 31, 2010 at 9:46 AM, Peng Yu <pengyu.ut at gmail.com> wrote:
>> Could somebody let me what tool I can use to calculate the number of
>> days before two dates in ubuntu?
> 
> You can use the date program. I'm currently reading up on it and I
> will attach a script or anything I come up with.
> to read yourself, try man date
> I'll be back ;)

i was thinking the date command too.  in BSD it has a useful -v switch
that i thought would be perfect.  alas, the linux version doesn't
include this switch :\
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