Oops. Bad on me; somehow convinced myself - despite a clear-enough question - that OP wanted to set system time:
This is really a question for a w32 forum; note that svenXY's method gives a conversion... but does NOT set system TZ.
However, if setting TZ is an acceptable alternate:

Diligent search here (or with ppm, if you're using Active State) for WIN::API may help you.

or, otherwise,

ppm's WIN32API-File-Time may (I have not checked it) also provide some guidance/clues.

In reply to Re: setting timezone in windows by ww
in thread setting timezone in windows by Anonymous Monk

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