找出两次java之间的区别

Find difference between two time in java

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Possible Duplicate:
How to convert Milliseconds to"X mins, x seconds" in Java?
Calculating the Difference Between Two Java Date Instances

我有这样的功能：

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public String setDateAndTime(int h, int m, int s,int amPm) {
TimeZone nst = TimeZone.getTimeZone("GMT+5:45");
Calendar calendar1 = new GregorianCalendar(nst);
Date currentTime1 = new Date();
calendar1.setTime(currentTime1);

calendar1.set(Calendar.HOUR, h);
calendar1.set(Calendar.MINUTE, m);
calendar1.set(Calendar.SECOND, s);
calendar1.set(Calendar.YEAR, calendar1.get(Calendar.YEAR));
calendar1.set(Calendar.MONTH, calendar1.get(Calendar.MONTH));
calendar1.set(Calendar.DAY_OF_MONTH, calendar1.get(Calendar.DAY_OF_MONTH));
calendar1.set(Calendar.AM_PM, amPm);

DateFormat formatter = new SimpleDateFormat("hh:mm:ss a");
String date = formatter.format(calendar1.getTime());

return date;
}

通过这个函数我创建了两个日期(String)

1 2	String s1=setDateAndTime(12,00,00,1);//12:00:00 PM String s2=setDateAndTime(3,15,45,0);//3:15:45 AM

现在如何找到找到s1和s2之间的差异，我还需要小时，分钟和第二左，这样我才能做进一步的处理。