java计算时间差

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package com;

import org.joda.time.DateTime;
import org.joda.time.Duration;

public class Test {
public static void main(String[] args) {

  String beginStr="20150218";
  String endStr="20150301";
  System.out.println(" 时间差："+calculateTimeInterval(beginStr,endStr));

}
//计算时间区间，开始时间其实是以00:00:00开始，结束则为23:59:59所以原则上加上一天的区间
public static long calculateTimeInterval(String beginStr,String endStr){
  String beginString = dateFormat(beginStr);
  String endString = dateFormat(endStr);
  DateTime begin = new DateTime(beginString);
  DateTime end = new DateTime(endString);
  Duration d = new Duration(begin, end);

  long time = d.getStandardDays();
  return time;
}

public static String dateFormat(String date){
  String year = date.substring(0,4);
  String month = date.substring(4,6);
  String day = date.substring(6,8);
  String returnDate = year+"-"+month+"-"+day;
  System.out.println(returnDate);
  return returnDate;
}

}

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