Days and hours of operation

Getting, setting, and formatting dates in Java
1 Java provides 3 date classes: Date, calendar, and DateFormat.
The date () method is used primarily to create date objects and obtain dates;
The Calendar () method is primarily used to get and set the date;
The DateFormat () method is primarily used to create date formatters and then convert dates to various date format string outputs by the formatter.
2 The base date specified in the Java language is Greenwich Mean Time 1970.1.1.00:00:00, and the current date is converted from the number of milliseconds experienced by the base date.
3 The Datefomat class is in the Java.text package, and the date and calendar classes are in the Java.util package.
4) Examples are as follows:
Import java.util.*;
Import java.text.*;

public class Displaydate {
public static void Main (string[] args) {
Date today;
Calendar now;
DateFormat F1,f2;
String s1,s2;

System.out.println ("\ n show the relevant usage of the date class");

Today = new Date ();
System.out.println ("new Date () = \ T" + today);

System.out.println ("\ n show various date formats with DateFormat class");

Show various date formats
F1 = Dateformat.getdateinstance ();
S1 = F1.format (today);
System.out.println ("dateformat.getdateinstance () = t" +s1);

F1 = Dateformat.getdateinstance (Dateformat.long,locale.china);
S1 = F1.format (today);
System.out.println ("dateformat.getdateinstance (Dateformat.long,locale.china) = \ T" + S1);

F1 = Dateformat.getdateinstance (Dateformat.medium,locale.china);
S1 = F1.format (today);
System.out.println ("dateformat.getdateinstance (Dateformat.medium,locale.china) = \ T" + S1);

F1 = Dateformat.getdateinstance (Dateformat.short,locale.china);
S1 = F1.format (today);
System.out.println ("dateformat.getdateinstance (Dateformat.short,locale.china) = \ T" + S1);

System.out.println ("\ n show various time formats with DateFormat class");

Show various time formats
F1 = Dateformat.gettimeinstance ();
S1 = F1.format (today);
System.out.println ("dateformat.gettimeinstance () = t" +s1);

F1 = Dateformat.gettimeinstance (Dateformat.long,locale.china);
S1 = F1.format (today);
System.out.println ("dateformat.gettimeinstance (Dateformat.long,locale.china) = \ t" +s1);

F1 = Dateformat.gettimeinstance (Dateformat.medium,locale.china);
S1 = F1.format (today);
System.out.println ("dateformat.gettimeinstance (Dateformat.medium,locale.china) = \ t" +s1);

F1 = Dateformat.gettimeinstance (Dateformat.short,locale.china);
S1 = F1.format (today);
System.out.println ("dateformat.gettimeinstance (Dateformat.short,locale.china) = \ t" +s1);

System.out.println ("Show relative time usage for calendar");

now = Calendar.getinstance ();
Today = Now.gettime ();
System.out.println ("Calendar.getinstance (). getTime () = \ T" + today.tostring ());

}
}

The results of the program operation are shown as follows:

Show the relative usage of the date class
New Date () = Fri may 13:29:32 CST 2003

displaying various date formats with the DateFormat class
Dateformat.getdateinstance () = 2003-5-2
Dateformat.getdateinstance (Dateformat.long,locale.china) = May 2, 2003
Dateformat.getdateinstance (Dateformat.medium,locale.china) = 2003-5-2
Dateformat.getdateinstance (Dateformat.short,locale.china) = 03-5-2

Displaying various time formats with the DateFormat class
Dateformat.gettimeinstance () = 13:29:32
Dateformat.gettimeinstance (Dateformat.long,locale.china) = 01:29 P.M. 32 seconds
Dateformat.gettimeinstance (Dateformat.medium,locale.china) = 13:29:32
Dateformat.gettimeinstance (Dateformat.short,locale.china) = 1:29

Show relative time usage for calendar
Calendar.getinstance (). GetTime () = Fri may 13:29:33 CST 2003