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package jadeutils.base;

import java.util.Calendar;
import java.util.Date;

public class DateCaculater {

	/*
	 * 取得两个时间段的时间间隔 return t2 与t1的间隔天数 throws ParseException
	 * 如果输入的日期格式不是0000-00-00 格式抛出异常
	 */
	public static int getBetweenDays(Date d1, Date d2) {
		int betweenDays = 0;
		Calendar c1 = Calendar.getInstance();
		Calendar c2 = Calendar.getInstance();
		c1.setTime(d1);
		c2.setTime(d2);
		// 保证第二个时间一定大于第一个时间
		if (c1.after(c2)) {
			c1 = c2;
			c2.setTime(d1);
		}
		int betweenYears = c2.get(Calendar.YEAR) - c1.get(Calendar.YEAR);
		betweenDays = c2.get(Calendar.DAY_OF_YEAR)
				- c1.get(Calendar.DAY_OF_YEAR);
		for (int i = 0; i < betweenYears; i++) {
			c1.set(Calendar.YEAR, (c1.get(Calendar.YEAR) + 1));
			betweenDays += c1.getMaximum(Calendar.DAY_OF_YEAR);
		}
		return betweenDays;
	}
}