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[very noob question] how can i calculate the hours passed between 2 different times and between days in C (lemmy.ca)

submitted 1 year ago by Vilian@lemmy.ca to c/programming@beehaw.org

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hello, i'm new to programming in i'm trying to solve this exercise in C, basically it's the amount of passed hours between the start of a game and it's end, if the game started at 16 and ended at 2 the result is a game with 10 hours(in different days) i know i can to it more manually, but i wanted to somehow use the <time.h> to learn how to use a header etc, can someone help me?, thank you all

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[–] juni@skein.city 1 points 1 year ago

Most of my hobby programming is in ANSI C and C99, so I'm unfortunately far too aware of the weird and counter-intuitive things the C and POSIX standards say. :P

clock() is fantastic for sub-second timings, such as deltatimes in games, or peripheral synchronization, which matches the use case you mention very well. I recommended time() over it as OP's use case is for calculating the amount of hours a user has had their software open, and unix timestamps are the perfect mechanism to do that in my opinion.