建立 java
DateTime dateTime = new DateTime(year,month,day,hour ,minute,second,milliseconds);code
DateTime dateTime = new DateTime(1910, 1, 1, 0, 0, 0, 0);orm
日期的增減對象
例: 計算 11 月中第一個星期一以後的第一個星期二字符串
LocalDate now = SystemFactory.getClock().getLocalDate(); LocalDate electionDate = now.monthOfYear() .setCopy(11) // November .dayOfMonth() // Access Day Of Month Property .withMinimumValue() // Get its minimum value .plusDays(6) // Add 6 days .dayOfWeek() // Access Day Of Week Property .setCopy("Monday") // Set to Monday (it will round down) .plusDays(1); // Gives us Tuesday
日期的區間get
Period p = new Period(old.getMillis(), now.getMillis());it
一、時間類得做成io
//方法一:取系統點間 date
DateTime dt1 = new DateTime(); 方法
//方法二:經過java.util.Date對象生成
DateTime dt2 = new DateTime(new Date());
//方法三:指定年月日點分秒生成(參數依次是:年,月,日,時,分,秒,毫秒)
DateTime dt3 = new DateTime(2012, 5, 20, 13, 14, 0, 0);
//方法四:ISO8601形式生成
DateTime dt4 = new DateTime("2012-05-20");
DateTime dt5 = new DateTime("2012-05-20T13:14:00");
//只須要年月日的時候
LocalDate localDate = new LocalDate(2009, 9, 6);// September 6, 2009
//只須要時分秒毫秒的時候
LocalTime localTime = new LocalTime(13, 30, 26, 0);// 1:30:26PM
二、獲取年月日點分秒
DateTime dt = new DateTime();
//年
int year = dt.getYear();
//月
int month = dt.getMonthOfYear();
//日
int day = dt.getDayOfMonth();
//星期
int week = dt.getDayOfWeek();
//點
int hour = dt.getHourOfDay();
//分
int min = dt.getMinuteOfHour();
//秒
int sec = dt.getSecondOfMinute();
//毫秒
int msec = dt.getMillisOfSecond();
DateTime dt = new DateTime();
三、星期的特殊處理
//星期
switch(dt.getDayOfWeek()) {
case DateTimeConstants.SUNDAY:
System.out.println("星期日");
break;
case DateTimeConstants.MONDAY:
System.out.println("星期一");
break;
case DateTimeConstants.TUESDAY:
System.out.println("星期二");
break;
case DateTimeConstants.WEDNESDAY:
System.out.println("星期三");
break;
case DateTimeConstants.THURSDAY:
System.out.println("星期四");
break;
case DateTimeConstants.FRIDAY:
System.out.println("星期五");
break;
case DateTimeConstants.SATURDAY:
System.out.println("星期六");
break;
}
DateTime dt = new DateTime();
四、與JDK日期對象的轉換
DateTime dt = new DateTime();
//轉換成java.util.Date對象
Date d1 = new Date(dt.getMillis());
Date d2 = dt.toDate();
//轉換成java.util.Calendar對象
Calendar c1 = Calendar.getInstance();
c1.setTimeInMillis(dt.getMillis());
Calendar c2 = dt.toCalendar(Locale.getDefault());
五、日期先後推算
//昨天
DateTime yesterday = dt.minusDays(1);
//明天
DateTime tomorrow = dt.plusDays(1);
//1個月前
DateTime before1month = dt.minusMonths(1);
//3個月後
DateTime after3month = dt.plusMonths(3);
//2年前
DateTime before2year = dt.minusYears(2);
//5年後
DateTime after5year = dt.plusYears(5);
七、時區
//默認設置爲日本時間
DateTimeZone.setDefault(DateTimeZone.forID("Asia/Tokyo"));
DateTime dt1 = new DateTime();
//倫敦時間
DateTime dt2 = new DateTime(DateTimeZone.forID("Europe/London"));
DateTime begin = new DateTime("2012-02-01");
DateTime end = new DateTime("2012-05-01");
八、計算區間
//計算區間毫秒數
Duration d = new Duration(begin, end);
long time = d.getMillis();
//計算區間天數
Period p = new Period(begin, end, PeriodType.days());
int days = p.getDays();
//計算特定日期是否在該區間內
Interval i = new Interval(begin, end);
boolean contained = i.contains(new DateTime("2012-03-01"));
九、日期比較
DateTime d1 = new DateTime("2012-02-01");
DateTime d2 = new DateTime("2012-05-01");
//和系統時間比
boolean b1 = d1.isAfterNow();
boolean b2 = d1.isBeforeNow();
boolean b3 = d1.isEqualNow();
//和其餘日期比
boolean f1 = d1.isAfter(d2);
boolean f2 = d1.isBefore(d2);
boolean f3 = d1.isEqual(d2);
十、格式化輸出
清單 11. 傳遞 SimpleDateFormat
字符串
DateTime dateTime = SystemFactory.getClock().getDateTime(); dateTime.toString("MM/dd/yyyy hh:mm:ss.SSSa"); dateTime.toString("dd-MM-yyyy HH:mm:ss"); dateTime.toString("EEEE dd MMMM, yyyy HH:mm:ssa"); dateTime.toString("MM/dd/yyyy HH:mm ZZZZ"); dateTime.toString("MM/dd/yyyy HH:mm Z"); 09/06/2009 02:30:00.000PM 06-Sep-2009 14:30:00 Sunday 06 September, 2009 14:30:00PM 09/06/2009 14:30 America/Chicago 09/06/2009 14:30 -0500
<dependency> <groupId>joda-time</groupId> <artifactId>joda-time</artifactId> <version>2.8</version> </dependency>