Question

How to get the day of week of the current date as a number in C

Answer 1

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

// size_t strftime(char *str, size_t maxsize, const char *format, const struct tm *timeptr)

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

    struct tm dt = *localtime(&t);

    printf("%d-%02d-%02d\n", dt.tm_year + 1900, dt.tm_mon + 1, dt.tm_mday);

    char buffer[32];

    strftime(buffer, sizeof(buffer), "%w", &dt); // 0..6
    puts(buffer);

    return 0;
}


// 0 = sunday

/*
run:

2023-05-14
0

*/

 

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