Can you explain how did you get this formulas?
I was searching whole net few years ago, and best I could think is to type dates for whole century find pattern, and put it in lookup table.
EDIT:
Heckler,
Just found this
http://delphiforfun.org/programs/mat...cs/dstcalc.htm
Basically what Enigma wrote, but it have calculation for US.
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