Java Operations on time

1.Date Get current time

1.1 Convert time milliseconds to date format.

Importnew Date (System.currenttimemillis ()); // The current millisecond time is passed String time=d.tolocalestring (); // returns the 2015-8-17 11:08:26 format string // format required by using SimpleDateFormat conversion Import Java.text.SimpleDateFormat; SimpleDateFormat sdf=new simpledateformat ("Yyyy-mm-dd hh:mm:ss"//  Output 2015-8-17 11:08:26

1.2 Get Time Example

 Public voidgettimebydate () {Date Date=NewDate ();D Ateformat df1= Dateformat.getdateinstance ();//date format, accurate to daySystem.out.println (Df1.format (date));D Ateformat df2= Dateformat.getdatetimeinstance ();//can be accurate to time division secondsSystem.out.println (Df2.format (date));D Ateformat df3= Dateformat.gettimeinstance ();//only shows the secondsSystem.out.println (Df3.format (date));D Ateformat df4= Dateformat.getdatetimeinstance (dateformat.full,dateformat.full);//display date, week, afternoon, time (accurate to seconds)System.out.println (Df4.format (date)); DateFormat Df5= Dateformat.getdatetimeinstance (Dateformat.long,dateformat.long);//display date, last afternoon, time (accurate to seconds)System.out.println (Df5.format (date));D Ateformat Df6= Dateformat.getdatetimeinstance (Dateformat.short,dateformat.short);//display date, last afternoon, time (accurate to minute)System.out.println (Df6.format (date));D Ateformat df7= Dateformat.getdatetimeinstance (Dateformat.medium,dateformat.medium);//Display date, time (accurate to minute)System.out.println (Df7.format (date));  Public voidGettimebycalendar () {Calendar cal=calendar.getinstance ()intYear = Cal.get (calendar.year);//Get yearintMonth=cal.get (Calendar.month);//Get MonthintDay=cal.get (calendar.date);//Get DayintHour=cal.get (Calendar.hour);//hoursintMinute=cal.get (Calendar.minute);//pointsintSecond=cal.get (Calendar.second);//secondsintWeekOfYear = Cal.get (Calendar.day_of_week);//the day of the weekSystem.out.println ("The current time is: A.D." +year+ "Year" +month+ "month" +day+ "Day" +hour+ "when" +minute+ "Minute" +second+ "second week" +weekofyear); }

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Java Operations on time