Java获取各种常用时间方法

 package  com.hefeng.test;


 import  java.text.DateFormat;
 import  java.text.ParsePosition;
 import  java.text.SimpleDateFormat;
 import  java.util.Calendar;
 import  java.util.Date;
 import  java.util.GregorianCalendar;

 public   class  TimeTest {
     //用来全局控制 上一周，本周，下一周的周数变化
     private    int  weeks =  0 ;
     private   int  MaxDate; //一月最大天数
     private   int  MaxYear; //一年最大天数


     /**
      * @param args
      */
     public   static   void  main(String[] args) {
         TimeTest tt = new  TimeTest();
         System.out.println("获取当天日期:" +tt.getNowTime( "yyyy-MM-dd" ));
         System.out.println("获取本周一日期:" +tt.getMondayOFWeek());
         System.out.println("获取本周日的日期~:" +tt.getCurrentWeekday());
         System.out.println("获取上周一日期:" +tt.getPreviousWeekday());
         System.out.println("获取上周日日期:" +tt.getPreviousWeekSunday());
         System.out.println("获取下周一日期:" +tt.getNextMonday());
         System.out.println("获取下周日日期:" +tt.getNextSunday());
         System.out.println("获得相应周的周六的日期:" +tt.getNowTime( "yyyy-MM-dd" ));
         System.out.println("获取本月第一天日期:" +tt.getFirstDayOfMonth());
         System.out.println("获取本月最后一天日期:" +tt.getDefaultDay());
         System.out.println("获取上月第一天日期:" +tt.getPreviousMonthFirst());
         System.out.println("获取上月最后一天的日期:" +tt.getPreviousMonthEnd());
         System.out.println("获取下月第一天日期:" +tt.getNextMonthFirst());
         System.out.println("获取下月最后一天日期:" +tt.getNextMonthEnd());
         System.out.println("获取本年的第一天日期:" +tt.getCurrentYearFirst());
         System.out.println("获取本年最后一天日期:" +tt.getCurrentYearEnd());
         System.out.println("获取去年的第一天日期:" +tt.getPreviousYearFirst());
         System.out.println("获取去年的最后一天日期:" +tt.getPreviousYearEnd());
         System.out.println("获取明年第一天日期:" +tt.getNextYearFirst());
         System.out.println("获取明年最后一天日期:" +tt.getNextYearEnd());
         System.out.println("获取本季度第一天到最后一天:" +tt.getThisSeasonTime( 11 ));
         System.out.println("获取两个日期之间间隔天数2008-12-1~2008-9.29:" +TimeTest.getTwoDay( "2008-12-1" , "2008-9-29" ));
     }


     /**
         * 得到二个日期间的间隔天数
         */
     public   static  String getTwoDay(String sj1, String sj2) {
         SimpleDateFormat myFormatter = new  SimpleDateFormat( "yyyy-MM-dd" );
         long  day =  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   "" ;
         }
         return  day +  "" ;
     }


     /**
         * 根据一个日期，返回是星期几的字符串
         *
         * @param sdate
         * @return
         */
     public   static  String getWeek(String sdate) {
         // 再转换为时间
         Date date = TimeTest.strToDate(sdate);
         Calendar c = Calendar.getInstance();
         c.setTime(date);
         // int hour=c.get(Calendar.DAY_OF_WEEK);
         // hour中存的就是星期几了，其范围 1~7
         // 1=星期日 7=星期六，其他类推
         return   new  SimpleDateFormat( "EEEE" ).format(c.getTime());
     }

     /**
         * 将短时间格式字符串转换为时间 yyyy-MM-dd
         *
         * @param strDate
         * @return
         */
     public   static  Date strToDate(String strDate) {
         SimpleDateFormat formatter = new  SimpleDateFormat( "yyyy-MM-dd" );
         ParsePosition pos = new  ParsePosition( 0 );
         Date strtodate = formatter.parse(strDate, pos);
         return  strtodate;
     }

     /**
         * 两个时间之间的天数
         *
         * @param date1
         * @param date2
         * @return
         */
     public   static   long  getDays(String date1, String date2) {
         if  (date1 ==  null  || date1.equals( "" ))
          return   0 ;
         if  (date2 ==  null  || date2.equals( "" ))
          return   0 ;
         // 转换为标准时间
         SimpleDateFormat myFormatter = new  SimpleDateFormat( "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) {
         }
         long  day = (date.getTime() - mydate.getTime()) / ( 24  *  60  *  60  *  1000 );
         return  day;
     }




     // 计算当月最后一天,返回字符串
     public  String getDefaultDay(){
        String str = "" ;
        SimpleDateFormat sdf=new  SimpleDateFormat( "yyyy-MM-dd" );

        Calendar lastDate = Calendar.getInstance();
        lastDate.set(Calendar.DATE,1 ); //设为当前月的1号
        lastDate.add(Calendar.MONTH,1 ); //加一个月，变为下月的1号
        lastDate.add(Calendar.DATE,-1 ); //减去一天，变为当月最后一天

        str=sdf.format(lastDate.getTime());
        return  str;
     }

     // 上月第一天
     public  String getPreviousMonthFirst(){
        String str = "" ;
        SimpleDateFormat sdf=new  SimpleDateFormat( "yyyy-MM-dd" );

        Calendar lastDate = Calendar.getInstance();
        lastDate.set(Calendar.DATE,1 ); //设为当前月的1号
        lastDate.add(Calendar.MONTH,-1 ); //减一个月，变为下月的1号
        //lastDate.add(Calendar.DATE,-1);//减去一天，变为当月最后一天

        str=sdf.format(lastDate.getTime());
        return  str;
     }

     //获取当月第一天
     public  String getFirstDayOfMonth(){
        String str = "" ;
        SimpleDateFormat sdf=new  SimpleDateFormat( "yyyy-MM-dd" );

        Calendar lastDate = Calendar.getInstance();
        lastDate.set(Calendar.DATE,1 ); //设为当前月的1号
        str=sdf.format(lastDate.getTime());
        return  str;
     }

     // 获得本周星期日的日期
     public  String getCurrentWeekday() {
         weeks = 0 ;
         int  mondayPlus =  this .getMondayPlus();
         GregorianCalendar currentDate = new  GregorianCalendar();
         currentDate.add(GregorianCalendar.DATE, mondayPlus+6 );
         Date monday = currentDate.getTime();

         DateFormat df = DateFormat.getDateInstance();
         String preMonday = df.format(monday);
         return  preMonday;
     }


     //获取当天时间
     public  String 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);
         return  hehe;
     }

     // 获得当前日期与本周日相差的天数
     private   int  getMondayPlus() {
         Calendar cd = Calendar.getInstance();
         // 获得今天是一周的第几天，星期日是第一天，星期二是第二天......
         int  dayOfWeek = cd.get(Calendar.DAY_OF_WEEK)- 1 ;          //因为按中国礼拜一作为第一天所以这里减1
         if  (dayOfWeek ==  1 ) {
             return   0 ;
         } else  {
             return   1  - dayOfWeek;
         }
     }

     //获得本周一的日期
     public  String getMondayOFWeek(){
          weeks = 0 ;
          int  mondayPlus =  this .getMondayPlus();
          GregorianCalendar currentDate = new  GregorianCalendar();
          currentDate.add(GregorianCalendar.DATE, mondayPlus);
          Date monday = currentDate.getTime();

          DateFormat df = DateFormat.getDateInstance();
          String preMonday = df.format(monday);
          return  preMonday;
     }

   //获得相应周的周六的日期
     public  String getSaturday() {
         int  mondayPlus =  this .getMondayPlus();
         GregorianCalendar currentDate = new  GregorianCalendar();
         currentDate.add(GregorianCalendar.DATE, mondayPlus + 7  * weeks +  6 );
         Date monday = currentDate.getTime();
         DateFormat df = DateFormat.getDateInstance();
         String preMonday = df.format(monday);
         return  preMonday;
     }

  // 获得上周星期日的日期
     public  String getPreviousWeekSunday() {
         weeks=0 ;
         weeks--;
         int  mondayPlus =  this .getMondayPlus();
         GregorianCalendar currentDate = new  GregorianCalendar();
         currentDate.add(GregorianCalendar.DATE, mondayPlus+weeks);
         Date monday = currentDate.getTime();
         DateFormat df = DateFormat.getDateInstance();
         String preMonday = df.format(monday);
         return  preMonday;
     }

  // 获得上周星期一的日期
     public  String getPreviousWeekday() {
         weeks--;
         int  mondayPlus =  this .getMondayPlus();
         GregorianCalendar currentDate = new  GregorianCalendar();
         currentDate.add(GregorianCalendar.DATE, mondayPlus + 7  * weeks);
         Date monday = currentDate.getTime();
         DateFormat df = DateFormat.getDateInstance();
         String preMonday = df.format(monday);
         return  preMonday;
     }

     // 获得下周星期一的日期
     public  String getNextMonday() {
         weeks++;
         int  mondayPlus =  this .getMondayPlus();
         GregorianCalendar currentDate = new  GregorianCalendar();
         currentDate.add(GregorianCalendar.DATE, mondayPlus + 7 );
         Date monday = currentDate.getTime();
         DateFormat df = DateFormat.getDateInstance();
         String preMonday = df.format(monday);
         return  preMonday;
     }

  // 获得下周星期日的日期
     public  String getNextSunday() {

         int  mondayPlus =  this .getMondayPlus();
         GregorianCalendar currentDate = new  GregorianCalendar();
         currentDate.add(GregorianCalendar.DATE, mondayPlus + 7 + 6 );
         Date monday = currentDate.getTime();
         DateFormat df = DateFormat.getDateInstance();
         String preMonday = df.format(monday);
         return  preMonday;
     }



     private   int  getMonthPlus(){
         Calendar cd = Calendar.getInstance();
         int  monthOfNumber = cd.get(Calendar.DAY_OF_MONTH);
         cd.set(Calendar.DATE, 1 ); //把日期设置为当月第一天
         cd.roll(Calendar.DATE, -1 ); //日期回滚一天，也就是最后一天
         MaxDate=cd.get(Calendar.DATE);
         if (monthOfNumber ==  1 ){
             return  -MaxDate;
         }else {
             return   1 -monthOfNumber;
         }
     }

   //获得上月最后一天的日期
     public  String getPreviousMonthEnd(){
         String str = "" ;
        SimpleDateFormat sdf=new  SimpleDateFormat( "yyyy-MM-dd" );

        Calendar lastDate = Calendar.getInstance();
       lastDate.add(Calendar.MONTH,-1 ); //减一个月
       lastDate.set(Calendar.DATE, 1 ); //把日期设置为当月第一天
       lastDate.roll(Calendar.DATE, -1 ); //日期回滚一天，也就是本月最后一天
        str=sdf.format(lastDate.getTime());
        return  str;
     }

   //获得下个月第一天的日期
     public  String getNextMonthFirst(){
         String str = "" ;
        SimpleDateFormat sdf=new  SimpleDateFormat( "yyyy-MM-dd" );

        Calendar lastDate = Calendar.getInstance();
       lastDate.add(Calendar.MONTH,1 ); //减一个月
       lastDate.set(Calendar.DATE, 1 ); //把日期设置为当月第一天
        str=sdf.format(lastDate.getTime());
        return  str;
     }

   //获得下个月最后一天的日期
     public  String getNextMonthEnd(){
         String str = "" ;
        SimpleDateFormat sdf=new  SimpleDateFormat( "yyyy-MM-dd" );

        Calendar lastDate = Calendar.getInstance();
       lastDate.add(Calendar.MONTH,1 ); //加一个月
       lastDate.set(Calendar.DATE, 1 ); //把日期设置为当月第一天
       lastDate.roll(Calendar.DATE, -1 ); //日期回滚一天，也就是本月最后一天
        str=sdf.format(lastDate.getTime());
        return  str;
     }

     //获得明年最后一天的日期
     public  String getNextYearEnd(){
         String str = "" ;
        SimpleDateFormat sdf=new  SimpleDateFormat( "yyyy-MM-dd" );

       Calendar lastDate = Calendar.getInstance();
       lastDate.add(Calendar.YEAR,1 ); //加一个年
       lastDate.set(Calendar.DAY_OF_YEAR, 1 );
      lastDate.roll(Calendar.DAY_OF_YEAR, -1 );
        str=sdf.format(lastDate.getTime());
        return  str;
     }

   //获得明年第一天的日期
     public  String getNextYearFirst(){
         String str = "" ;
        SimpleDateFormat sdf=new  SimpleDateFormat( "yyyy-MM-dd" );

       Calendar lastDate = Calendar.getInstance();
       lastDate.add(Calendar.YEAR,1 ); //加一个年
       lastDate.set(Calendar.DAY_OF_YEAR, 1 );
            str=sdf.format(lastDate.getTime());
       return  str;

     }

   //获得本年有多少天
     private   int  getMaxYear(){
         Calendar cd = Calendar.getInstance();
         cd.set(Calendar.DAY_OF_YEAR,1 ); //把日期设为当年第一天
         cd.roll(Calendar.DAY_OF_YEAR,-1 ); //把日期回滚一天。
         int  MaxYear = cd.get(Calendar.DAY_OF_YEAR);
         return  MaxYear;
     }

     private   int  getYearPlus(){
         Calendar cd = Calendar.getInstance();
         int  yearOfNumber = cd.get(Calendar.DAY_OF_YEAR); //获得当天是一年中的第几天
         cd.set(Calendar.DAY_OF_YEAR,1 ); //把日期设为当年第一天
         cd.roll(Calendar.DAY_OF_YEAR,-1 ); //把日期回滚一天。
         int  MaxYear = cd.get(Calendar.DAY_OF_YEAR);
         if (yearOfNumber ==  1 ){
             return  -MaxYear;
         }else {
             return   1 -yearOfNumber;
         }
     }
   //获得本年第一天的日期
     public  String getCurrentYearFirst(){
         int  yearPlus =  this .getYearPlus();
         GregorianCalendar currentDate = new  GregorianCalendar();
         currentDate.add(GregorianCalendar.DATE,yearPlus);
         Date yearDay = currentDate.getTime();
         DateFormat df = DateFormat.getDateInstance();
         String preYearDay = df.format(yearDay);
         return  preYearDay;
     }


   //获得本年最后一天的日期 *
     public  String getCurrentYearEnd(){
         Date date = new  Date();
         SimpleDateFormat   dateFormat   =   new    SimpleDateFormat( "yyyy" ); //可以方便地修改日期格式
         String  years  = dateFormat.format(date);
         return  years+ "-12-31" ;
     }


   //获得上年第一天的日期 *
     public  String getPreviousYearFirst(){
         Date date = new  Date();
         SimpleDateFormat   dateFormat   =   new    SimpleDateFormat( "yyyy" ); //可以方便地修改日期格式
         String  years  = dateFormat.format(date); int  years_value = Integer.parseInt(years);
         years_value--;
         return  years_value+ "-1-1" ;
     }

   //获得上年最后一天的日期
     public  String getPreviousYearEnd(){
         weeks--;
         int  yearPlus =  this .getYearPlus();
         GregorianCalendar currentDate = new  GregorianCalendar();
         currentDate.add(GregorianCalendar.DATE,yearPlus+MaxYear*weeks+(MaxYear-1 ));
         Date yearDay = currentDate.getTime();
         DateFormat df = DateFormat.getDateInstance();
         String preYearDay = df.format(yearDay);
         getThisSeasonTime(11 );
         return  preYearDay;
     }

   //获得本季度
     public  String getThisSeasonTime( int  month){
         int  array[][] = {{ 1 , 2 , 3 },{ 4 , 5 , 6 },{ 7 , 8 , 9 },{ 10 , 11 , 12 }};
         int  season =  1 ;
         if (month>= 1 &&month<= 3 ){
             season = 1 ;
         }
         if (month>= 4 &&month<= 6 ){
             season = 2 ;
         }
         if (month>= 7 &&month<= 9 ){
             season = 3 ;
         }
         if (month>= 10 &&month<= 12 ){
             season = 4 ;
         }
         int  start_month = array[season- 1 ][ 0 ];
         int  end_month = array[season- 1 ][ 2 ];

         Date date = new  Date();
         SimpleDateFormat   dateFormat   =   new    SimpleDateFormat( "yyyy" ); //可以方便地修改日期格式
         String  years  = dateFormat.format(date);
         int  years_value = Integer.parseInt(years);

         int  start_days = 1 ; //years+"-"+String.valueOf(start_month)+"-1";//getLastDayOfMonth(years_value,start_month);
         int  end_days = getLastDayOfMonth(years_value,end_month);
         String seasonDate = years_value+"-" +start_month+ "-" +start_days+ ";" +years_value+ "-" +end_month+ "-" +end_days;
         return  seasonDate;

     }

     /**
      * 获取某年某月的最后一天
      * @param year 年
      * @param month 月
      * @return 最后一天
      */
    private   int  getLastDayOfMonth( int  year,  int  month) {
          if  (month ==  1  || month ==  3  || month ==  5  || month ==  7  || month ==  8
                    || month == 10  || month ==  12 ) {
                return   31 ;
          }
          if  (month ==  4  || month ==  6  || month ==  9  || month ==  11 ) {
                return   30 ;
          }
          if  (month ==  2 ) {
                if  (isLeapYear(year)) {
                    return   29 ;
                } else  {
                    return   28 ;
                }
          }
          return   0 ;
    }
    /**
     * 是否闰年
     * @param year 年
     * @return
     */
   public   boolean  isLeapYear( int  year) {
         return  (year %  4  ==  0  && year %  100  !=  0 ) || (year %  400  ==  0 );
   }
 }