timegm cross platform

Question

I\'m using Visual Studio c++ Compiler ( 2010 ), but the library has different implementation of ANSI C and POSIX libraries function.

What is the difference betw

Answer 1

For most functions, that I know of, there is no difference.

The underscore in the names is there to emphasize that these are not standard C functions: AFAIK, there are not tzset nor setenv functions in ANSI C. They are mostly POSIX functions that are implemented by the MS CRT as an aid for portability from other operating systems.

But they don't claim POSIX compatibility, that's why the underscore. And that's why you should be careful and read the MS documentation about these functions... there are demons there!