java获取时间戳

2023-07-26 14:12:46

1、当前时间的换时间戳

System.out.println(System.currentTimeMillis());//精确到毫秒
System.out.println(System.currentTimeMillis()/1000); //精确到秒

2、获取昨天当前时间的时间戳

Calendar calendar = Calendar.getInstance();
calendar.add(Calendar.DAY_OF_YEAR,-1);
long millisecond=calendar.getTime().getTime();//精确到毫秒
long timestamp=calendar.getTime().getTime()/1000;//精确到秒
System.out.println(millisecond);
System.out.println(timestamp);

3、获取今天零点时间戳

long time=System.currentTimeMillis();
long millisecond=time/(1000*3600*24)*(1000*3600*24)- TimeZone.getDefault().getRawOffset();
System.out.println(millisecond/1000);//精确到秒
System.out.println(millisecond);//精确到毫秒

4、获取昨天零点的时间戳

Calendar calendar = Calendar.getInstance();
calendar.set(calendar.get(Calendar.YEAR),calendar.get(Calendar.MARCH),calendar.get(Calendar.DAY_OF_MONTH)-1,0,0,0);
long millisecond=calendar.getTime().getTime();//精确到毫秒
long timestamp = calendar.getTime().getTime()/1000;//精确到秒
System.out.println(millisecond);
System.out.println(timestamp);

5、获取今天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 millisecond = calendar.getTime().getTime();//精确到毫秒
long timestamp=calendar.getTime().getTime()/1000;//精确到秒
System.out.println(millisecond);
System.out.println(timestamp);

6、获取昨天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 millisecond = calendar.getTime().getTime();//精确到毫秒
long timestamp=calendar.getTime().getTime()/1000;//精确到秒
System.out.println(millisecond);
System.out.println(timestamp);

7、获取七天前零点的时间戳（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);//时间参数根据需要修改
long millisecond = calendar.getTime().getTime();//精确到毫秒
long timestamp=calendar.getTime().getTime()/1000;//精确到秒
System.out.println(millisecond);
System.out.println(timestamp);

8、获取三十天前23点59分59秒的时间戳（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)-30,23,59,59);//时间参数根据需要修改
long millisecond = calendar.getTime().getTime();//精确到毫秒
long timestamp=calendar.getTime().getTime()/1000;//精确到秒
System.out.println(millisecond);
System.out.println(timestamp);

9、获取本月第一天零点的时间戳

Calendar calendar=Calendar.getInstance();
calendar.set(calendar.get(Calendar.YEAR),calendar.get(Calendar.MONTH),1,0,0,0);
long millisecond = calendar.getTime().getTime();//精确到毫秒
long timestamp=calendar.getTime().getTime()/1000;//精确到秒
System.out.println(millisecond);
System.out.println(timestamp);

10、获取上月第一天零点的时间戳

Calendar calendar=Calendar.getInstance();
calendar.set(calendar.get(Calendar.YEAR),calendar.get(Calendar.MONTH)-1,1,0,0,0);
long millisecond = calendar.getTime().getTime();//精确到毫秒
long timestamp=calendar.getTime().getTime()/1000;//精确到秒
System.out.println(millisecond);
System.out.println(timestamp);

11、获取本月最后一天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);
calendar.set(Calendar.DAY_OF_MONTH,calendar.getActualMaximum(Calendar.DAY_OF_MONTH));
long millisecond = calendar.getTime().getTime();//精确到毫秒
long timestamp=calendar.getTime().getTime()/1000;//精确到秒
System.out.println(millisecond);
System.out.println(timestamp);

12、获取上月最后一天23点59分59秒的时间戳

Calendar calendar=Calendar.getInstance();
calendar.set(calendar.get(Calendar.YEAR),calendar.get(Calendar.MONTH)-1,
        calendar.get(Calendar.DAY_OF_MONTH),23,59,59);
calendar.set(Calendar.DAY_OF_MONTH,calendar.getActualMaximum(Calendar.DAY_OF_MONTH));
long millisecond = calendar.getTime().getTime();//精确到毫秒
long timestamp=calendar.getTime().getTime()/1000;//精确到秒
System.out.println(millisecond);
System.out.println(timestamp);

13、获取指定时间的时间戳

try {
    System.out.println(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss:SSS").parse("2021-11-28 13:19:44:111").getTime());//精确到毫秒
    System.out.println(new SimpleDateFormat("yyyy/MM/dd HH:mm:ss:SSS").parse("2021/11/28 13:19:44:111").getTime());//精确到毫秒
    System.out.println(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss:SSS").parse("2021-11-28 13:19:44:111").getTime());//精确到秒
    System.out.println(new SimpleDateFormat("yyyy/MM/dd HH:mm:ss:SSS").parse("2021/11/28 13:19:44:111").getTime());//精确到秒
} catch (ParseException e) {
    e.printStackTrace();
}

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