I dimly remember once having had a similar issue, which - IIRC - was solved by re-exec-ing the program after having changed the environment variable (not entirely sure though — can't find the code and don't have a Windows system to try at the moment...)

In reply to Re: How to set a processes notion of the timezone on win32? by almut
in thread How to set a processes notion of the timezone on win32? by jaldhar

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