java时间运算收藏

import java.text.SimpleDateFormat;import java.util.Calendar;public class DateAll { public static void main(String[] args) throws Exception {//当前时间 Calendar cal = Calendar.getInstance(); //SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss G E D F w W a E F"); String mDateTime=formatter.format(cal.getTime()); System.out.println(mDateTime);//1年前日期 java.util.Date myDate=new java.util.Date(); long myTime=(myDate.getTime()/1000)-60*60*24*365; myDate.setTime(myTime*1000); String mDate=formatter.format(myDate); System.out.println(mDate);//明天日期 myDate=new java.util.Date(); myTime=(myDate.getTime()/1000)+60*60*24; myDate.setTime(myTime*1000); mDate=formatter.format(myDate); System.out.println(mDate);//两个时间之间的天数 SimpleDateFormat myFormatter = new SimpleDateFormat("yyyy-MM-dd"); java.util.Date date= myFormatter.parse("1883-10-10"); java.util.Date mydate= myFormatter.parse("1899-12-30"); long day=(date.getTime()-mydate.getTime())/(24*60*60*1000); System.out.println(day);//加半小时 SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss"); java.util.Date date1 = format.parse("2002-02-28 23:16:00"); long Time=(date1.getTime()/1000)+60*30; date1.setTime(Time*1000); String mydate1=formatter.format(date1); System.out.println(mydate1);//年月周求日期 SimpleDateFormat formatter2 = new SimpleDateFormat("yyyy-MM F E"); java.util.Date date2= formatter2.parse("2003-05 5 星期五"); SimpleDateFormat formatter3 = new SimpleDateFormat("yyyy-MM-dd"); String mydate2=formatter3.format(date2); System.out.println(mydate2);//求是星期几 mydate= myFormatter.parse("2007-11-9"); SimpleDateFormat formatter4 = new SimpleDateFormat("E"); String mydate3=formatter4.format(mydate); System.out.println(mydate3); }}