计算月份天数工具类

package timer;

/**
 * @author mercy
 * 计算月份工具类
 *闰年29天平年28天
 */
public class CalculateDay {
	public static void main(String[] args) {
		int year=1700;
		int month=2;
		int day= getDay(year,month);
		System.out.println(day);
	}
	public static int getDay(int year,int month){
		int day=0;
		switch(month){
		case 1: case 3: case 5: case 7: case 8: case 10: case 12:
			day=31;
			break;
		case 4: case 6: case 9: case 11:
			day=30;
			break;
		case 2:
			day=getTwoMonthDay(year);
		}
		return day;
	}
	/**
	 * @param year
	 * 能被100整除且能被400整除是闰年，能被4整除的是闰年
	 * @return
	 */
	public static int getTwoMonthDay(int year){
		int day=0;
		if(year%100==0){
			if(year%400==0){
				day=29;
			}else{
				day=28;
			}
		}else if(year% 4==0){
			day=29;
		}else{
			day=28;
		}
		return day;
		
	}
}