Our VC++ studio 6.0 application uses _timezone variable. Where does it get that value from? From the system clock or msvcrt.dll?

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Q: Our VC++ studio 6.0 application uses _timezone variable. Where does it get that value from? From the system clock or msvcrt.dll?
A: Environment variables are provided by the parent process, which includes system-wide settings. Also, a process can change its own environment block using the following functions: _tzset(), _putenv(), _wputenv(), _putenv_s(), _wputenv_s(), SetEnvironmentVariable()