Joda-time of Java Date calculation

http://rensanning.iteye.com/blog/1546652

Joda-time provides a set of Java class packages for working with date and time, including the ISO8601 standard. It can be used to completely replace the JDK date and calendar classes, and still provide good integration.

http://joda-time.sourceforge.net/

Version: Joda-time-2.1.jar

1, time class to be made

Java code

2. Method One: Take the system between points
4. DateTime DT1 = new DateTime ();
8. Method Two: Generate by Java.util.Date object
10. DateTime DT2 = new DateTime (new Date ());
14. Method Three: Specify the day of the month and the second generation (the parameters are: years, months, days, hours, minutes, seconds, milliseconds)
16. DateTime DT3 = new DateTime (5, 0, 0);
20. Method Four: ISO8601 form generation
22. DateTime DT4 = new DateTime ("2012-05-20");
24. DateTime DT5 = new DateTime ("2012-05-20t13:14:00");
28. It only takes years and days
30. Localdate localdate = new Localdate ( 9, 6); September 6,
34. It just takes a minute, seconds, minutes.
36. LocalTime localtime = new LocalTime ( 0); 1:30:26pm

2, get the date of the day and seconds.

Java code

2. DateTime dt = new DateTime ();
4. Years
6. int year = Dt.getyear ();
8. Month
10. int month = Dt.getmonthofyear ();
12. Day
14. int day = Dt.getdayofmonth ();
16. Week
18. Int week = Dt.getdayofweek ();
20. Point
22. int hour = Dt.gethourofday ();
24. Score of
26. int min = Dt.getminuteofhour ();
28. Seconds
30. int sec = Dt.getsecondofminute ();
32. Milliseconds
34. int msec = Dt.getmillisofsecond ();

3, the special treatment of the week

Java code

2. DateTime dt = new DateTime ();
6. Week
8. Switch (Dt.getdayofweek ()) {
10. Case Datetimeconstants.sunday:
12. System.out.println ("Sunday");
14. Break ;
16. Case Datetimeconstants.monday:
18. System.out.println ("Monday");
20. Break ;
22. Case Datetimeconstants.tuesday:
24. System.out.println ("Tuesday");
26. Break ;
28. Case Datetimeconstants.wednesday:
30. System.out.println ("Wednesday");
32. Break ;
34. Case Datetimeconstants.thursday:
36. System.out.println ("Thursday");
38. Break ;
40. Case Datetimeconstants.friday:
42. System.out.println ("Friday");
44. Break ;
46. Case Datetimeconstants.saturday:
48. System.out.println ("Saturday");
50. Break ;
52. }

4. Conversion to JDK Date Object

Java code

1. DateTime dt = new DateTime ();
3. Convert to Java.util.Date Object
4. Date D1 = new Date (Dt.getmillis ());
5. Date D2 = Dt.todate ();
7. Convert to Java.util.Calendar Object
8. Calendar C1 = Calendar.getinstance ();
9. C1.settimeinmillis (Dt.getmillis ());
10. Calendar C2 = Dt.tocalendar (Locale.getdefault ());

5, the date before and after the calculation

Java code

2. DateTime dt = new DateTime ();
6. Yesterday
8. DateTime yesterday = dt.minusdays (1);
10. Tomorrow
12. DateTime tomorrow = Dt.plusdays (1);
14. 1 months ago
16. DateTime before1month = dt.minusmonths (1);
18. 3 months later
20. DateTime after3month = dt.plusmonths (3);
22. 2 years ago
24. DateTime before2year = Dt.minusyears (2);
26. 5 years later
28. DateTime after5year = Dt.plusyears (5);

6. Take special dates

Java code

1. DateTime dt = new DateTime ();
3. Month End Date
4. DateTime Lastday = Dt.dayofmonth (). Withmaximumvalue ();
6. 90 days later, Monday of that week.
7. DateTime FirstDay = dt.plusdays (All). DayOfWeek (). Withminimumvalue ();

7. Time Zone

Java code

1. The default setting is Japan time
2. Datetimezone.setdefault (Datetimezone.forid ("Asia/tokyo"));
3. DateTime DT1 = new DateTime ();
5. London time
6. DateTime DT2 = new DateTime (Datetimezone.forid ("Europe/london"));

8. Calculation Interval

Java code

2. DateTime begin = new DateTime ("2012-02-01");
4. DateTime end = new DateTime ("2012-05-01");
8. Calculate interval Millisecond Number
10. Duration d = new Duration (begin, end);
12. Long time = D.getmillis ();
16. Calculate Interval Days
18. Period p = new Period (Begin, End, Periodtype.days ());
20. int days = P.getdays ();
24. Calculates whether a specific date is within the range
26. Interval i = new Interval (begin, end);
28. Boolean contained = I.contains (new DateTime ("2012-03-01"));

9. Date comparison

Java code

2. DateTime d1 = new DateTime ("2012-02-01");
4. DateTime d2 = new DateTime ("2012-05-01");
8. and system time ratio
10. Boolean B1 = D1.isafternow ();
12. Boolean b2 = D1.isbeforenow ();
14. Boolean b3 = D1.isequalnow ();
18. and other dates than
20. Boolean f1 = D1.isafter (D2);
22. Boolean F2 = D1.isbefore (D2);
24. Boolean f3 = D1.isequal (D2);

10. Formatted output

Java code

1. datetime datetime = new DateTime ();
3. String S1 = datetime.tostring ("Yyyy/mm/dd hh:mm:ss.  SSSa ");
4. String s2 = datetime.tostring ("Yyyy-mm-dd HH:mm:ss");
5. String s3 = datetime.tostring ("eeee dd MMMM, yyyy HH:mm:ssa");
6. String S4 = datetime.tostring ("Yyyy/mm/dd hh:mm ZZZZ");
7. String S5 = datetime.tostring ("Yyyy/mm/dd hh:mm Z");

Jodd's Jdatetime also offers a very good time API.

Reference: http://www.ibm.com/developerworks/cn/java/j-jodatime.html

Joda-time of Java Date calculation