Java gets two milliseconds of a date difference

Method one can use the GetTime () method of date to convert the time of the current date format to the number of milliseconds and subtract from it.

Long systime = new Date (). GetTime ();//Current system time
Long oldtime = Old.gettime ();//Comparison of time
Long time = (systime-oldtime);//Millisecond of difference

Method two uses the calendar's Gettimeinmillis () method to convert the time of the current date format to the number of milliseconds.

Calendar nowdate=calendar.getinstance ();
Calendar olddate=calendar.getinstance ();
Nowdate.settime (New Date ());//set to current system time
Olddate.settime (old);//set to the date you want to compare
Long Timenow=nowdate.gettimeinmillis ();
Long Timeold=olddate.gettimeinmillis ();
Long time = (timenow-timeold);//Millisecond of difference

The number of milliseconds to get a two-day difference can get two dates apart in a few days when a few seconds.

Java gets two milliseconds of a date difference