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

int main(void) {
	struct tm test_datetime = {
		.tm_mday = 0,
		.tm_mon = 1 - 1,
		.tm_year = 2020 - 1900,
	}; /* 0/1/2020 */
	
	mktime(&test_datetime);
	puts(asctime(&test_datetime));
	return 0;
}