Question

How to get the number of the current day of year in C

Answer 1

#include <stdio.h>
#include <time.h>

int GetDayOfYear() {
    time_t t = time(NULL);

    struct tm tm = *localtime(&t);

    int year = tm.tm_year + 1900;
    int month = tm.tm_mon + 1;
    int day = tm.tm_mday;
         
    struct tm date = {};
    
    date.tm_year = year - 1900;
    date.tm_mon = month - 1;
    date.tm_mday = day;
    
    mktime(&date);
    
    return date.tm_yday + 1;
}

int main() {
    
    int dayOfYear = GetDayOfYear();

    printf("%d", dayOfYear);
}




/*
run:

356

*/

 

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