Convert date to timestamp?

[NZ_Kiwis]

I have a date MM/DD/YY and some DD/MM/YY how can I convert these to unix time stamps?

[bradgrafelman]

That's hard to answer; do you at least know which are which? For example, if I gave you the date 01/02/03, how do you know whether that's January 2nd or February 1st?

This is precisely why there are standard/universal date formats you should always stick to. 😉