Question

How to add 21 days to a date in C

Answer 1

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

int main(void) {
    struct tm tm = { 0 };

    tm.tm_mon = 6 - 1; // 6 (June)
    tm.tm_mday = 14;
    tm.tm_year = 2022 - 1900; // 2022
    tm.tm_isdst = -1;

    tm.tm_mday += 21; // 21 Days

    if (mktime(&tm) == -1)
        fprintf(stderr, "mktime failed");
    else
        printf("%d/%d/%d", tm.tm_mon + 1, tm.tm_mday, tm.tm_year + 1900);

    return 0;
}




/*
run:

7/5/2022

*/

 

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