Interestingly, this does not apply to Windows.
Well, for geeky values of interesting.
For the real geeks: The epoch in Windows is 1/1/1601. Windows uses a representation of time which measures nanoseconds since the epoch. This is stored as a 64 bit value.
As anyone who has tried will know, the most popular language for scripting Windows stuff (vbscript) doesn't handle 64 bit arithmetic. So, if you *want* to do date calculations in script, you have to do some really hacky stuff (which is documented).
Anyway. That's your useless bit of information for the day.