Java 計算時間間隔

public static void main(String[] args) throws ParseException {

long d1,d2,d3;

ArrayList<String> list = new ArrayList();

SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");

Calendar calendar = new GregorianCalendar();

String datestr1 = "2010-01-01";

String datestr2 = "2011-03-01";

d1 = df.parse(datestr2).getTime();

d2 = df.parse(datestr1).getTime();

d3 = Math.abs((d1-d2)/1000/60/60/24);//時間間隔

for (int i = 0; i <= d3; i++) {

calendar.setTime(java.sql.Date.valueOf(datestr1));

calendar.add(calendar.DATE,i);//得到下一天時間

list.add(df.format(calendar.getTime()).toString());

}

for (int i = 0; i < list.size(); i++) {

System.out.println(list.get(i));

}