Function that substracts days, hours, minutes, and seconds from the current system time in epoch seconds

timedelta.c

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

time_t days_to_seconds(uint32_t days)
{
    return days * 24 * 60 * 60;
}

time_t hours_to_seconds(uint32_t hours)
{
    return hours * 60 * 60;
}

time_t minutes_to_seconds(uint32_t minutes)
{
    return minutes * 60;
}

time_t timediff(uint32_t days, uint32_t hours, uint32_t minutes, uint32_t seconds)
{
    time_t current_time = 0, dseconds = 0, hseconds = 0, mseconds = 0;
    time(&current_time);
    dseconds = days_to_seconds(days);
    hseconds = hours_to_seconds(hours);
    mseconds = minutes_to_seconds(minutes);
    return current_time - dseconds - hseconds - mseconds - seconds;
}

void print_human_time(time_t t)
{
    struct tm *info = NULL;
    info = localtime(&t);
    printf("- %s\n", asctime(info));
}

int main(int argc, char **argv)
{
    time_t current_time = 0;
    time(&current_time);
    time_t result = timediff(1, 1, 1, 1);
    print_human_time(result);
    print_human_time(current_time);
    return 0;
}