JAVA获取时间戳整理

1.获取 昨天这个时间的时间戳

        Calendar calendar = Calendar.getInstance();     //当前时间
        calendar.add(Calendar.DAY_OF_YEAR,-1);  
        Long dd = calendar.getTime().getTime()/1000;
        System.out.println(dd);

2.计算今天0点的时间戳

       Long  time = System.currentTimeMillis();  //当前时间的时间戳
       long zero = time/(1000*3600*24)*(1000*3600*24) - TimeZone.getDefault().getRawOffset();
       System.out.println(new Timestamp(zero));//今天零点零分零秒
       System.out.println(zero/1000);

3.计算今天23点59分59秒的时间戳

     Calendar calendar = Calendar.getInstance();
     calendar.set(calendar.get(Calendar.YEAR),calendar.get(Calendar.MONTH),calendar.get(Calendar.DAY_OF_MONTH),23,59,59);
     long tt = calendar.getTime().getTime()/1000;
     System.out.println(tt);

4.计算昨天0点的时间戳

     Calendar calendar = Calendar.getInstance();
     calendar.set(calendar.get(Calendar.YEAR),calendar.get(Calendar.MONTH),calendar.get(Calendar.DAY_OF_MONTH)-1,0,0,0);
     long tt = calendar.getTime().getTime()/1000;
     System.out.println(tt);

5.计算昨天23:59:59 秒的时间戳

     Calendar calendar = Calendar.getInstance();
     calendar.set(calendar.get(Calendar.YEAR),calendar.get(Calendar.MONTH),calendar.get(Calendar.DAY_OF_MONTH)-1,23,59,59);
     long tt = calendar.getTime().getTime()/1000;
     System.out.println(tt);

6.计算近7日 0点的时间戳(不包含当天)

     Calendar calendar = Calendar.getInstance();
     calendar.set(calendar.get(Calendar.YEAR),calendar.get(Calendar.MONTH),calendar.get(Calendar.DAY_OF_MONTH)-7,0,0,0);
     long tt = calendar.getTime().getTime()/1000;
     System.out.println(tt);

7.计算近30天 0点的时间戳(不包含当天)

     Calendar calendar = Calendar.getInstance();
     calendar.set(calendar.get(Calendar.YEAR),calendar.get(Calendar.MONTH),calendar.get(Calendar.DAY_OF_MONTH)-30,0,0,0);
     long tt = calendar.getTime().getTime()/1000;
     System.out.println(tt);

8.计算上月第一天 0点的时间戳

     Calendar calendar = Calendar.getInstance();
     calendar.set(calendar.get(Calendar.YEAR),calendar.get(Calendar.MONTH)-1,1,0,0,0);
     long tt = calendar.getTime().getTime()/1000;
     System.out.println(tt);

9.计算上月最后一天 23点的时间戳

     Calendar calendar = Calendar.getInstance();            
     calendar.set(calendar.get(Calendar.YEAR),calendar.get(Calendar.MONTH)-1,calendar.get(Calendar.DAY_OF_MONTH),23,59,59);
     calendar.set(Calendar.DAY_OF_MONTH,calendar.getActualMaximum(Calendar.DAY_OF_MONTH));
     long tt = calendar.getTime().getTime()/1000;
     System.out.println(tt)

9.计算上周周一 0点的时间戳

     Calendar calendar = Calendar.getInstance();
     calendar.set(calendar.get(Calendar.YEAR),calendar.get(Calendar.MONDAY), calendar.get(Calendar.DAY_OF_MONTH), 0, 0,0);
     calendar.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
     calendar.add(Calendar.DATE,-7);
     System.out.println(calendar.getTime().getTime()/1000);

10.计算上周周日23点的时间戳

     Calendar calendar = Calendar.getInstance();
     calendar.set(calendar.get(Calendar.YEAR),calendar.get(Calendar.MONDAY), calendar.get(Calendar.DAY_OF_MONTH), 23, 59,59);
     calendar.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
     calendar.add(Calendar.DATE,-1);
     System.out.println(calendar.getTime().getTime()/1000);

11.计算本月第一天0点的时间戳

     Calendar calendar = Calendar.getInstance();
     calendar.set(calendar.get(Calendar.YEAR),calendar.get(Calendar.MONDAY), calendar.get(Calendar.DAY_OF_MONTH), 0, 0,0);
     calendar.set(Calendar.DAY_OF_MONTH,calendar.getActualMinimum(Calendar.DAY_OF_MONTH));
     long tt = calendar.getTime().getTime()/1000;
    System.out.println(tt);

12.计算本月最后一天23:59:59的时间戳

     Calendar calendar = Calendar.getInstance();
     calendar.set(calendar.get(Calendar.YEAR),calendar.get(Calendar.MONDAY), calendar.get(Calendar.DAY_OF_MONTH), 23, 59,59);
     calendar.set(Calendar.DAY_OF_MONTH,calendar.getActualMaximum(Calendar.DAY_OF_MONTH));
     long tt = calendar.getTime().getTime()/1000;
     System.out.println(tt);