Help with Grep and date

[omega_grey]

I am newb
I've run out of places to look but I think that some smart person here may
be able to help me.

If I have a text file full of dates in the format 01/12/08 or 1/12/08 can
grep rewrite it as 2008-12-01.

and for kicks, since I am asking. can you take 3:00 pm and make it military
time?

Thank you ahead of time.
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