如何计算时间差？

Question

比如 :
d1="2011-03-02";
d2="2011-03-17";
他们的天数相差15天，
怎么计算他们的时间差？

Answer 1

static Calendar getCalendar(String time)
{
if (null == time)
{
return null;
}
String[] times = time.split("-");
Calendar calendar = Calendar.getInstance();
calendar.set(Integer.valueOf(times[0]), Integer.valueOf(times[1]), Integer.valueOf(times[2]));
return calendar;
}

public static void main(String[] args)
{
    String startTime1 = "2011-03-02";
    String startTime2 = "2011-03-17";
    Calendar c1 = getCalendar(startTime1);
    Calendar c2 = getCalendar(startTime2);


    System.out.println("相差天数："
            + (c2.getTimeInMillis() - c1.getTimeInMillis())/1000*60*60*24;

}