开源项目DATE4J可以简化日期的操作

以往要使用Java对时间日期进行操作，可能会用到以下的一些类：

Date and its subclasses : 

java.util.Date 
java.sql.Date 
java.sql.Timestamp 
The calendar and time zone classes : 

java.util.Calendar 
java.util.GregorianCalendar 
java.util.TimeZone 
java.util.SimpleTimeZone (for use with the Gregorian calendar only) 
The formatting and parsing classes : 

java.text.DateFormat 
java.text.SimpleDateFormat 
java.text.DateFormatSymbols 

以上这么多类用起来是不是很麻烦呢，现在好了，有了DATE4J，就不用这么麻烦了。

下面是一些简单的实例：

//Examples   
//Here are some quick examples of using date4j's DateTime class :   
DateTime dateAndTime = new DateTime("2010-01-19 23:59:59");   
DateTime dateAndTime = new DateTime("2010-01-19 23:59:59.123456789");   
DateTime dateOnly = new DateTime("2010-01-19");   
DateTime timeOnly = new DateTime("23:59:59");   
DateTime dateOnly = DateTime.forDateOnly(2010,01,19);   
DateTime timeOnly = DateTime.forTimeOnly(23,59,59,0);   
DateTime dt = new DateTime("2010-01-15 13:59:15");   
boolean leap = dt.isLeapYear(); //false   
dt.getNumDaysInMonth(); //31   
dt.getStartOfMonth(); //2010-01-01, 00:00:00.000000000   
dt.getEndOfDay(); //2010-01-15, 23:59:59.999999999   
dt.format("YYYY-MM-DD"); //formats as '2010-01-15'   
dt.plusDays(30); //30 days after Jan 15   
dt.numDaysFrom(someDate); //returns an int   
dueDate.lt(someDate); //less-than   
dueDate.lteq(someDate); //less-than-or-equal-to   
//Although DateTime carries no TimeZone information internally, there are methods that take a TimeZone as a parameter :   
DateTime now = DateTime.now(someTimeZone);   
DateTime today = DateTime.today(someTimeZone);   
DateTime fromMilliseconds = DateTime.forInstant(31313121L, someTimeZone);   
birthday.isInFuture(someTimeZone);   
dt.changeTimeZone(fromOneTimeZone, toAnotherTimeZone); 

评论

1 楼 liumingwei2009 2010-05-22  

还没翻译完全吧！呵呵