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我怎么能够用UTC的时间设定一个日历?
原标题:How can I set a Calendar with UTC time?
  • 时间:2011-05-19 13:13:16
  •  标签:
  • java
  • date
  • utc

The posters here say that Date is always in UTC time. However, if I create a Date(), create a Calendar, and set the calendar time with the date, the time remains my local time (and I am not on UTC time. I ve tested this by printing out the calendar s date in a loop, subtracting an hour per loop. It s 11pm on the 19th of May here, and it takes 24 loops before the date changes to the 18th of May. It s currently 1pm UTC, so if the calendar were set properly it would only take 14 loops.

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

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

    int index = 0;
    for(; index > -30; index--)
    {
        System.out.println(index);
        System.out.println(dateFormatter.format(calendar.getTime()));
        System.out.println();
        calendar.add(Calendar.HOUR, -1);
    }
问题回答

java.util.Calendar 有一个固定工厂方法,需要一个时间区。

Calendar.getInstance(java.util.timeZone)

So you can say:

Calendar calendar = Calendar.getInstance(TimeZone.getTimeZone("UTC"));




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