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This specifically goes for gmtime() function in C, although if it gets time differently compared to the other time functions I’d like to know.
Like if I change the system time will it mess things up? Will it get the wrong time?
Yes. they are dependent upon the value of the system clock. If you change the system clock you will get different results as that is the only way that it can get the current system time (unless you use something like NTP but you won’t find that in any C/C++ standard library).