java - 为什么我的日历总是返回当前时间？

Question

我有这个代码:

Calendar now = Calendar.getInstance();
            now.setTime(new Date(System.currentTimeMillis()));

            Calendar calendar = Calendar.getInstance();
            calendar.setTime(new Date(image.date));


double score = calendar.get(Calendar.HOUR_OF_DAY) - now.get(Calendar.HOUR_OF_DAY)));

我有一次时间:image.date = 1407918131283，还有一次image.date = 1407925331901。但 calendar.get(Calendar.HOUR_OF_DAY) 始终返回 11。这是为什么？

Answer 1

使用 JodaTime 进行时间操作。它几乎可以替代有缺陷的内部 java 类

  final String dateStart = "01/14/2012 09:29:58";
  final String dateStop = "01/15/2012 10:31:48";
  final DateTimeFormatter format = DateTimeFormat.forPattern("MM/dd/yyyy HH:mm:ss");
  final DateTime dt1 = format.parseDateTime(dateStart);
  final DateTime dt2 = format.parseDateTime(dateStop);

  System.out.print(Days.daysBetween(dt1, dt2).getDays() + " days, ");
  System.out.print(Hours.hoursBetween(dt1, dt2).getHours() % 24 + " hours, ");
  System.out.print(Minutes.minutesBetween(dt1, dt2).getMinutes() % 60 + " minutes, ");
  System.out.print(Seconds.secondsBetween(dt1, dt2).getSeconds() % 60 + " seconds.");