Time Traveller Picks Non-Windows O/S...

I've been busy working on a .Net concentric solution to improve display of date time sensitive data to their projects. Discussing the project with peers brought up an interesting tangent. Can a time machine really be constructed with a Windows based operating system? How could you go back and forth through time without using UTC as a time base? Further, would any operating system be accurate enough to get you to a chosen point in time accurately? Hmm...

:)