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The basic approach of nearly all of the methods to calculate the day of the week begins by starting from an "anchor date": a known pair (such as 1 January 1800 as a Wednesday), determining the number of days between the known day and the day that you are trying to determine, and using arithmetic modulo 7 to find a new numerical day of the week.
timespec_get (C11) returns a calendar time based on a time base Format conversions asctime: converts a struct tm object to a textual representation (deprecated) ctime: converts a time_t value to a textual representation strftime: converts a struct tm object to custom textual representation strptime: converts a string with time information to a ...