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I need to store date in flat file. Is there any simple metod to get number of days since particular date (for example since 1 AD) using standard libary in C++11? The only one I know is to:
Can I perform it easier?
What you said sounds reasonable to start with. You can convert the struct tm to time_t using mktime. Note that mktime interprets its input as local time according to the system/environment settings, and there is no UTC counterpart that’s as widely available without relying on “extra” libraries, but maybe that’s not a problem for you.