获取时间差

public static String sjc(long t1, long t2)
	{
		long t3 = t1 - t2;

		long hour = t3 / (60 * 60 * 1000);
		long minute = (t3 - hour * 60 * 60 * 1000) / (60 * 1000);
		long second = (t3 - hour * 60 * 60 * 1000 - minute * 60 * 1000) / 1000;
		long millisecond = t3 - hour * 60 * 60 * 1000 - minute * 60 * 1000
				- second * 1000;

		if (millisecond > 1000)
		{
			second += millisecond / 1000;
			millisecond = millisecond % 1000;
		}
		if (second > 60)
		{
			minute += second / 60;
			second = second % 60;
		}
		if (minute > 60)
		{
			hour += minute / 60;
			minute = minute % 60;
		}

		String sh = "";
		String sm = "";
		String ss = "";
		
		if (hour < 10)
		{
			sh = "0" + String.valueOf(hour);
		}
		else
		{
			sh = String.valueOf(hour);
		}
		
		if (minute < 10)
		{
			sm = "0" + String.valueOf(minute);
		}
		else
		{
			sm = String.valueOf(minute);
		}
		
		if (second < 10)
		{
			ss = "0" + String.valueOf(second);
		}
		else
		{
			ss = String.valueOf(second);
		}

		return null;
	}