How do I find the current system timezone?

Question

On Linux, I need to find the currently configured timezone as an Olson location. I want my (C or C++) code to be portable to as many Linux systems as possible.

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Answer 1

According to this page, it looks like if you #include it will declare the following.

void tzset (void);
extern char *tzname[2];
extern long timezone;
extern int daylight;

Does that give you the information that you need?