#include <stdio.h>
#include <time.h>
int main()
{
    struct tm sttm;
    bzero(&sttm, sizeof(sttm));

    sttm.tm_year = 2023 - 1900;
    sttm.tm_mon = 5 - 1;
    sttm.tm_mday = 25;
    sttm.tm_hour = 17;
    sttm.tm_min = 15;
    sttm.tm_sec = 45;
    sttm.tm_isdst = 0;

    time_t tnow = mktime(&sttm);
    printf("tnow = %u\n", tnow);
    return 0;
}