ctime

#include <iostream>
#include <ctime>
using namespace std;

int main()
{
	//time_t
	time_t t = time(nullptr);
	cout << t << endl;

	// tm 타입
	int year = 2020;
	int mon = 12;
	int day = 13;
	int hour = 0;
	int min = 0;
	int sec = 0;
	tm tm1;
	tm1.tm_year = year - 1900;
	tm1.tm_mon = mon - 1;
	tm1.tm_mday = day;
	tm1.tm_hour = hour;
	tm1.tm_min = min;
	tm1.tm_sec = sec;

	// 특정 서식으로 문자열 출력
	char str[80];
	strftime(str, sizeof(str), "%Y-%m-%d", &tm1);  
	cout << str << endl;          

	//// time-t -> tm 타입 (로컬 타임)
	//tm tm2;
	//localtime_s(&tm2, &t);

	//// tm 타입을 time_t로 변환  
	//time_t t3;
	//tm tm3;
	//t3 = mktime(&tm3);

	 
}