Joda-time open source Library

Joda-time is a Java? The easy-to-use open-source time library of the platform.

Dependency

1 <dependency>2     <groupId>joda-time</groupId>3     <artifactId>joda-time</artifactId>4     <version>2.9.9</version>5 </dependency>

Usage

1. Generation of time and date classes

1 // Method 1: Take the system point 2 datetime dt1 = new datetime (); 3 4 // Method 2: Use Java. util. date object Generation 5 datetime dt2 = new datetime (new date (); 6 7 // method 3: specify year, month, day, minute, and second generation (the parameters are year, month, day, hour, minute, second, millisecond) 8 datetime dt3 = new datetime (2012, 5, 20, 13, 14, 0, 0); 9 10 // Method 4: generate 11 datetime dt4 = new datetime ("2012-05-20") in iso8601 format; 12 datetime dt5 = new datetime ("2012-05-20t13: 14: 00 "); 13 14 // only 15 localdate = new localdate (2009, 9, 6) when the year, month, and day are required; // September 6, 2009 16 17 // 18 localtime = new localtime (13, 30, 26, 0) when only hours, minutes, And seconds are required; // 1:30:26

2. Get year, month, day, minute, and second

1 datetime dt = new datetime (); 2 // year 3 int year = DT. getyear (); 4 // month 5 Int month = DT. getmonthofyear (); 6 // day 7 int day = DT. getdayofmonth (); 8 // week 9 int week = DT. getdayofweek (); 10 // point 11 int hour = DT. gethourofday (); 12 // minute 13 int min = DT. getminuteofhour (); 14 // second 15 int sec = DT. getsecondofminute (); 16 // millisecond 17 int MSEC = DT. getmillisofsecond ();

3. Weekly Processing

1 datetime dt = new datetime (); 2 3 // 4 switch (DT. getdayofweek () {5 case datetimeconstants. sunday: 6 system. out. println ("Sunday"); 7 break; 8 case datetimeconstants. monday: 9 system. out. println ("Monday"); 10 break; 11 case datetimeconstants. tuesday: 12 system. out. println ("Tuesday"); 13 break; 14 case datetimeconstants. wednesday: 15 system. out. println ("Wednesday"); 16 break; 17 case datetimeconstants. thursday: 18 system. out. println ("Thursday"); 19 break; 20 case datetimeconstants. friday: 21 system. out. println ("Friday"); 22 break; 23 case datetimeconstants. saturday: 24 system. out. println ("Saturday"); 25 break; 26}

4. Conversion from JDK objects

1 datetime dt = new datetime (); 2 3 // convert to Java. util. date object 4 Date d1 = new date (DT. getmillis (); 5 Date D2 = DT. todate (); 6 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. Calculation before and after the date

1 datetime dt = new datetime (); 2 3 // Yesterday 4 datetime yesterday = DT. minusdays (1); 5 // tomorrow 6 datetime Tomorrow = DT. plusdays (1); 7 // the first 8 datetime before1month = DT. minusmonths (1); 9 // 10 datetime after3month = DT after 3 months. plusmonths (3); 11 // 12 datetime before2year = DT 2 years ago. minusyears (2); 13 // 14 datetime after5year = DT after 5 years. plusyears (5 );

6. Time Comparison

Datetime d1 = new datetime ("2012-02-01"); datetime D2 = new datetime ("2012-05-01"); // compare with the system time boolean b1 = d1.isafternow (); boolean b2 = d1.isbeforenow (); Boolean B3 = d1.isequalnow (); // comparison with other dates: Boolean F1 = d1.isafter (D2); Boolean F2 = d1.isbefore (D2 ); boolean F3 = d1.isequal (D2 );

7. Time Difference

1 datetime begin = new datetime ("2012-02-01"); 2 datetime end = new datetime ("2012-05-01 "); 3 4 // Number of milliseconds in the calculation interval 5 Duration d = new duration (begin, end); 6 long time = D. getmillis (); 7 8 // number of days in the calculation interval 9 period p = New Period (begin, end, periodtype. days (); 10 int days = P. getdays (); 11 12 // calculate whether the specified date is within this range 13 interval I = new interval (begin, end); 14 Boolean contained = I. contains (New datetime ("2012-03-01 "));

8. format the output.

1 DateTime dateTime = new DateTime();  2   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"); 

 

Util template for joda-time

 1 public class DataTimeUtil{ 2      3     public static final String STANDARD_FORMAT = "yyyy-MM-dd HH:mm:ss"; 4  5     public static Date strToDate(String dataTimeStr){ 6         DataTimeFormatter dateTimeFormatter = DataTimeFormat.forPattern(STANDARD_FORMAT); 7         DateTime dateTime = dateTimeFormatter.parseDateTime(dataTimeStr); 8         return dateTime.toDate(); 9     }10     11     public static String dateToStr(Date date){12         if (date = null){13             return StringUtils.EMPTY;14         }15         DateTime dateTime = new Datetime(date);16         return datetime.toString(STANDARD_FORMAT);17     }18 }

 

 

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

Joda-time open source Library