I started looking into this, but I hit the limit of my currently available resources. I hope to look further into this tonight. Here's what I found out so far:
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POSIX::tzset is a thin wrapper for the C library function with the same name. The entirety of the XS code is:
void
tzset()
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Windows and Visual Studio support tzset.
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Changes to %ENV are reflected in the process's actual environment. I used Win32::ExpandEnvironmentStrings (which is mapped to a system call that knows nothing of %ENV) to verify this.
I hope to test the example code in MSDN's tzset documentation using VS6, what ActivePerl uses.
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