计算两个日期之间有多少天多少小时多少分钟

package date;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.List;

public class CalculateIntervalBetween2Dates {

private static final long DAY=24*60*60*1000;

private static final long HOUR=60*60*1000;

private static final long MINUTES=60*1000;

private static final long SECONDS=1000;

private static final long MILLIONSECONDS=1;


public static void main(String[] args) {
	String startDateStr = "20121022";
	String endDateStr = "20121206";
	CalculateIntervalBetween2Dates.listNumberOfDates(startDateStr, endDateStr);
	CalculateIntervalBetween2Dates.calculateInterval(startDateStr, endDateStr,MILLIONSECONDS);
	CalculateIntervalBetween2Dates.calculateInterval(startDateStr, endDateStr,SECONDS);
	CalculateIntervalBetween2Dates.calculateInterval(startDateStr, endDateStr,MINUTES);
	CalculateIntervalBetween2Dates.calculateInterval(startDateStr, endDateStr,HOUR);
	CalculateIntervalBetween2Dates.calculateInterval(startDateStr, endDateStr,DAY);

}


/**

* List dates between start date and end date, including the start date and end date.

* @param startDateStr

* @param endDateStr

*/

public static void listNumberOfDates(String startDateStr,String endDateStr){
	SimpleDateFormat sf = new SimpleDateFormat("yyyyMMdd");
	Date startDate = null;
	Date endDate = null;
	try {

startDate = sf.parse(startDateStr);

endDate = sf.parse(endDateStr);
	} catch (ParseException e) {

e.printStackTrace();
	}
	Calendar c1 = Calendar.getInstance();
	List<Date> cancelDates = new ArrayList<Date>();
	if (startDate != null && endDate != null && startDate.before(endDate)) {

Date tempDate = startDate;

do {

cancelDates.add(tempDate);

c1.setTime(tempDate);

c1.add(Calendar.DAY_OF_MONTH, 1);

tempDate = c1.getTime();

} while (tempDate.before(endDate));

cancelDates.add(endDate);
	}

	System.out.println("There are " + cancelDates.size() + " days between " + sf.format(startDate) + " and " + sf.format(endDate) + ", inclusive.");
	System.out.println("See the following list:");
	for (Date date : cancelDates) {

System.out.println(sf.format(date));
	}
	System.out.println();

}


/**

* Calculate how many days/hours/minutes/seconds/million seconds between start date and end date, including the start date and end date.

* @param startDateStr

* @param endDateStr

* @param interval

*/

public static void calculateInterval(String startDateStr,String endDateStr,long interval){
	SimpleDateFormat sf = new SimpleDateFormat("yyyyMMdd");
	Date startDate = null;
	Date endDate = null;
	try {

startDate = sf.parse(startDateStr);

endDate = sf.parse(endDateStr);
	} catch (ParseException e) {

e.printStackTrace();
	}
	Calendar c1 = Calendar.getInstance();
	c1.setTime(startDate);
	long startInMillis=c1.getTimeInMillis();
	c1.setTime(endDate);
	//inclusive,2009/10/24-2009/10/23=1,but actually 2 days
	c1.add(Calendar.DAY_OF_MONTH, 1);

	long endInMillis=c1.getTimeInMillis();
	long between=endInMillis-startInMillis;
	System.out.println("There are " + (between/interval) +" "+getIntervalLabel(interval) + " between " + sf.format(startDate) + " and " + sf.format(endDate) + ", inclusive");

}


private static String getIntervalLabel(long interval){
	if(interval==DAY){

return "days";
	}else if(interval==HOUR){

return "hours";
	}else if(interval==MINUTES){

return "minutes";
	}else if(interval==SECONDS){

return "seconds";
	}else if(interval==MILLIONSECONDS){

return "million seconds";
	}else{

return "error";
	}

}
}

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