Date Conversion

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Mental Image

I need to be able to convert a date in this format:

"04/10/05" (YY/MM/DD)

to this format:

"Fri 02-13-2004" (Day MM/DD/YYYY)

I can do the string manipulation easily enough, but does anyone know of a simple way of working out what DAY something occured on based solely on the date? I could use a lookup table, I'm sure, but an algorithm taking account of leap years (and millenia!) would be nice!

Thanks,

Paul