时间工具类代码,Java代码库,德仔网

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【Java】时间工具类
作者:Dezai.CN / 发布于2013/7/30/ 510

	package com.pzoom.ads.platform.report.task.utils;

	import java.util.Calendar;
	import java.util.Date;
	//根据今天的日期获取这个星期的星期一和星期日所对应的日期
	public class DayDiffer {
	 public int getIntervalDaysByCalendar(Calendar startday, Calendar endday) {
	 if (startday.after(endday)) {
	 Calendar cal = startday;
	 startday = endday;
	 endday = cal;
	 }
	 long sl = startday.getTimeInMillis();
	 long el = endday.getTimeInMillis();
	 long ei = el - sl;
	 return (int) (ei / (1000 * 60 * 60 * 24));
	 }

	 public int getIntervalDaysByDate(Date startday, Date endday) {
	 if (startday.after(endday)) {
	 Date cal = startday;
	 startday = endday;
	 endday = cal;
	 }
	 long sl = startday.getTime();
	 long el = endday.getTime();
	 long ei = el - sl;
	 return (int) (ei / (1000 * 60 * 60 * 24));
	 }

	 public int getDaysBetween(Calendar d1, Calendar d2) {
	 if (d1.after(d2)) {
	 java.util.Calendar swap = d1;
	 d1 = d2;
	 d2 = swap;
	 }
	 int days = d2.get(Calendar.DAY_OF_YEAR) - d1.get(Calendar.DAY_OF_YEAR);
	 int y2 = d2.get(Calendar.YEAR);
	 if (d1.get(Calendar.YEAR) != y2) {
	 d1 = (Calendar) d1.clone();
	 do {
	 days += d1.getActualMaximum(Calendar.DAY_OF_YEAR);// 得到当年的实际天??
	 d1.add(Calendar.YEAR, 1);
	 } while (d1.get(Calendar.YEAR) != y2);
	 }
	 return days;
	 }

	 public static void main(String[] args) {
	 Calendar calendar = Calendar.getInstance();
	 Date d = calendar.getTime();
	 DayDiffer dayDiffer=new DayDiffer();
	 System.out.println(dayDiffer.getOnaWeekStart(d));
	 System.err.println(dayDiffer.getOnaWeekEnd(d));
	 System.err.println(dayDiffer.getWeekStart(d));
	 }

	 public Date getOnaWeekStart(Date xz) {
	 Date date = getWeekStart(xz);
	 Calendar calendar = Calendar.getInstance();
	 calendar.setTime(date);
	 calendar.add(Calendar.DATE, -7);
	 return calendar.getTime();
	 }

	 public Date getOnaWeekEnd(Date xz) {
	 Date date = getOnaWeekStart(xz);
	 Calendar calendar = Calendar.getInstance();
	 calendar.setTime(date);
	 calendar.add(Calendar.DATE, 6);
	 return calendar.getTime();
	 }

	 public Date getWeekStart(Date xz) {
	 Calendar calendar = Calendar.getInstance();
	 calendar.setTime(xz);
	 Date d2 = calendar.getTime();
	 int week = calendar.get(calendar.DAY_OF_WEEK) - 2;
	 calendar.add(Calendar.DATE, -week);
	 return calendar.getTime();
	 }
	}
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