[C] 247 D-DAY 구하기 mktime

Desc :

 

 

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Source Code :

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

#define DAYSEC (24*60*60)

void main()
{
	time_t now;
	struct tm t, dday = {0,0,0,2,3,2021};
	int n1, n2, nDday;

	now = time(NULL);
	t = *localtime(&now);;

	dday.tm_year -= 1900;
	dday.tm_mon -= 1;

	t.tm_hour = 0;
	t.tm_min = 0;
	t.tm_sec = 0;

	n1 = mktime(&t);
	n2 = mktime(&dday);

	nDday = (n2 - n1) / DAYSEC;
	
	printf("개강일까지 %d일 남았습니다...(%d/%d/%d) \n"
		, nDday, dday.tm_year + 1900, dday.tm_mon + 1, dday.tm_mday);
}

 

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Result :