How can a Windows program temporarily change its time zone?

Question

I\'ve written a function to return the time_t value corresponding to midnight on a given day. When there is no midnight for a given day, it returns the earliest tim

Answer 1

Check out _putenv_s and _tzset. In theory, you should be able to set the TZ environment variable for your process with _putenv_s and then use _tzset to set the actual local time zone for your process to what the TZ environment variable is set to.

I know that this works on Linux with putenv and tzset, and from the documentation of _putenv_s and _tzset, it appears that you should be able to do the same with them on Windows. I haven't actually tried it though.