Java獲取各種常用時間方法大全
package*cc.javaweb.test;
- importjava.text.DateFormat;
- importjava.text.ParsePosition;
- importjava.text.SimpleDateFormat;
- importjava.util.Calendar;
- importjava.util.Date;
- importjava.util.GregorianCalendar;
- publicclassTimeTest {
- //用來全局控制 上一週，本週，下一週的週數變化
- privateintweeks =0;
- privateintMaxDate;//一月最大天數
- privateintMaxYear;//一年最大天數
- /**
- * @param args
- */
- publicstaticvoidmain(String[] args) {
- TimeTest tt =newTimeTest();
- System.out.println("獲取當天日期:"+tt.getNowTime("yyyy-MM-dd"));
- System.out.println("獲取本週一日期:"+tt.getMondayOFWeek());
- System.out.println("獲取本週日的日期~:"+tt.getCurrentWeekday());
- System.out.println("獲取上週一日期:"+tt.getPreviousWeekday());
- System.out.println("獲取上週日日期:"+tt.getPreviousWeekSunday());
- System.out.println("獲取下週一日期:"+tt.getNextMonday());
- System.out.println("獲取下週日日期:"+tt.getNextSunday());
- System.out.println("獲得相應周的週六的日期:"+tt.getNowTime("yyyy-MM-dd"));
- System.out.println("獲取本月第一天日期:"+tt.getFirstDayOfMonth());
- System.out.println("獲取本月最後一天日期:"+tt.getDefaultDay());
- System.out.println("獲取上月第一天日期:"+tt.getPreviousMonthFirst());
- System.out.println("獲取上月最後一天的日期:"+tt.getPreviousMonthEnd());
- System.out.println("獲取下月第一天日期:"+tt.getNextMonthFirst());
- System.out.println("獲取下月最後一天日期:"+tt.getNextMonthEnd());
- System.out.println("獲取本年的第一天日期:"+tt.getCurrentYearFirst());
- System.out.println("獲取本年最後一天日期:"+tt.getCurrentYearEnd());
- System.out.println("獲取去年的第一天日期:"+tt.getPreviousYearFirst());
- System.out.println("獲取去年的最後一天日期:"+tt.getPreviousYearEnd());
- System.out.println("獲取明年第一天日期:"+tt.getNextYearFirst());
- System.out.println("獲取明年最後一天日期:"+tt.getNextYearEnd());
- System.out.println("獲取本季度第一天到最後一天:"+tt.getThisSeasonTime(11));
- System.out.println("獲取兩個日期之間間隔天數2010-12-31~2010-9-14:"+TimeTest.getTwoDay("2010-12-31","2010-9-14"));
- }
- /**
- * 得到二個日期間的間隔天數
- */
- publicstaticString getTwoDay(String sj1, String sj2) {
- SimpleDateFormat myFormatter =newSimpleDateFormat("yyyy-MM-dd");
- longday =0;
- try{
- java.util.Date date = myFormatter.parse(sj1);
- java.util.Date mydate = myFormatter.parse(sj2);
- day = (date.getTime() - mydate.getTime()) / (24*60*60*1000);
- }catch(Exception e) {
- return"";
- }
- returnday +"";
- }
- /**
- * 根據一個日期，返回是星期幾的字符串
- *
- * @param sdate
- * @return
- */
- publicstaticString getWeek(String sdate) {
- // 再轉換爲時間
- Date date = TimeTest.strToDate(sdate);
- Calendar c = Calendar.getInstance();
- c.setTime(date);
- // int hour=c.get(Calendar.DAY_OF_WEEK);
- // hour中存的就是星期幾了，其範圍 1~7
- // 1=星期日 7=星期六，其他類推
- returnnewSimpleDateFormat("EEEE").format(c.getTime());
- }
- /**
- * 將短時間格式字符串轉換爲時間 yyyy-MM-dd
- *
- * @param strDate
- * @return
- */
- publicstaticDate strToDate(String strDate) {
- SimpleDateFormat formatter =newSimpleDateFormat("yyyy-MM-dd");
- ParsePosition pos =newParsePosition(0);
- Date strtodate = formatter.parse(strDate, pos);
- returnstrtodate;
- }
- /**
- * 兩個時間之間的天數
- *
- * @param date1
- * @param date2
- * @return
- */
- publicstaticlonggetDays(String date1, String date2) {
- if(date1 ==null|| date1.equals(""))
- return0;
- if(date2 ==null|| date2.equals(""))
- return0;
- // 轉換爲標準時間
- SimpleDateFormat myFormatter =newSimpleDateFormat("yyyy-MM-dd");
- java.util.Date date =null;
- java.util.Date mydate =null;
- try{
- date = myFormatter.parse(date1);
- mydate = myFormatter.parse(date2);
- }catch(Exception e) {
- }
- longday = (date.getTime() - mydate.getTime()) / (24*60*60*1000);
- returnday;
- }
- // 計算當月最後一天,返回字符串
- publicString getDefaultDay(){
- String str ="";
- SimpleDateFormat sdf=newSimpleDateFormat("yyyy-MM-dd");
- Calendar lastDate = Calendar.getInstance();
- lastDate.set(Calendar.DATE,1);//設爲當前月的1號
- lastDate.add(Calendar.MONTH,1);//加一個月，變爲下月的1號
- lastDate.add(Calendar.DATE,-1);//減去一天，變爲當月最後一天
- str=sdf.format(lastDate.getTime());
- returnstr;
- }
- // 上月第一天
- publicString getPreviousMonthFirst(){
- String str ="";
- SimpleDateFormat sdf=newSimpleDateFormat("yyyy-MM-dd");
- Calendar lastDate = Calendar.getInstance();
- lastDate.set(Calendar.DATE,1);//設爲當前月的1號
- lastDate.add(Calendar.MONTH,-1);//減一個月，變爲下月的1號
- //lastDate.add(Calendar.DATE,-1);//減去一天，變爲當月最後一天
- str=sdf.format(lastDate.getTime());
- returnstr;
- }
- //獲取當月第一天
- publicString getFirstDayOfMonth(){
- String str ="";
- SimpleDateFormat sdf=newSimpleDateFormat("yyyy-MM-dd");
- Calendar lastDate = Calendar.getInstance();
- lastDate.set(Calendar.DATE,1);//設爲當前月的1號
- str=sdf.format(lastDate.getTime());
- returnstr;
- }
- // 獲得本週星期日的日期
- publicString getCurrentWeekday() {
- weeks =0;
- intmondayPlus =this.getMondayPlus();
- GregorianCalendar currentDate =newGregorianCalendar();
- currentDate.add(GregorianCalendar.DATE, mondayPlus+6);
- Date monday = currentDate.getTime();
- DateFormat df = DateFormat.getDateInstance();
- String preMonday = df.format(monday);
- returnpreMonday;
- }
- //獲取當天時間
- publicString getNowTime(String dateformat){
- Date now = new Date();
- SimpleDateFormat dateFormat = new SimpleDateFormat(dateformat);//可以方便地修改日期格式
- String hehe = dateFormat.format(now);
- returnhehe;
- }
- // 獲得當前日期與本週日相差的天數
- privateintgetMondayPlus() {
- Calendar cd = Calendar.getInstance();
- // 獲得今天是一週的第幾天，星期日是第一天，星期二是第二天......
- intdayOfWeek = cd.get(Calendar.DAY_OF_WEEK)-1; //因爲按中國禮拜一作爲第一天所以這裏減1
- if(dayOfWeek ==1) {
- return0;
- }else{
- return1- dayOfWeek;
- }
- }
- //獲得本週一的日期
- publicString getMondayOFWeek(){
- weeks =0;
- intmondayPlus =this.getMondayPlus();
- GregorianCalendar currentDate =newGregorianCalendar();
- currentDate.add(GregorianCalendar.DATE, mondayPlus);
- Date monday = currentDate.getTime();
- DateFormat df = DateFormat.getDateInstance();
- String preMonday = df.format(monday);
- returnpreMonday;
- }
- //獲得相應周的週六的日期
- publicString getSaturday() {
- intmondayPlus =this.getMondayPlus();
- GregorianCalendar currentDate =newGregorianCalendar();
- currentDate.add(GregorianCalendar.DATE, mondayPlus +7* weeks +6);
- Date monday = currentDate.getTime();
- DateFormat df = DateFormat.getDateInstance();
- String preMonday = df.format(monday); return*preMonday;
** - ** }
**