Java计算从当前时间到事件的时间 [英] Java Calculate time until event from current time

问题描述

我正在计算足球比赛开始前的时间。

I am trying to calculate the amount of time until the start of a soccer game.

这就是我所知道的：

• 我有时间参加活动： 2016-08-16T19：45：00Z


• 我知道它的字符串格式为 yyyy-M-dd'T'h：m：s'Z'


• 我知道时区是CET 。

我希望能够计算从当前时间到此日期的差异。

I want to be able to calculate the difference from the current time to this date in days.

这就是我的尝试：

    String gameDate = "2016-03-19T19:45:00'Z'"
    DateFormat apiFormat = new SimpleDateFormat("yyyy-M-dd'T'h:m:s'Z'");
    apiFormat.setTimeZone(TimeZone.getTimeZone("CET"));
    Date dateOfGame = apiFormat.parse(gameDate);

    DateFormat currentDateFormat = new SimpleDateFormat("yyyy-M-dd'T'h:m:s'Z'");
    currentDateFormat.setTimeZone(TimeZone.getTimeZone(userTimezone));
    Date currentDate = apiFormat.parse(currentDateFormat.format(new Date()));

    long lGameDate = dateOfGame.getTime();
    long lcurrDate = currentDate.getTime();
    long difference = lGameDate - lcurrDate;
    Date timeDifference = new Date(difference);

    String daysAway = new SimpleDateFormat("d").format(timeDifference);
    Integer intDaysAway = Integer.parseInt(daysAway);

你可能想知道为什么我不只是得到游戏的日期（8）并减去当前日期（19）。我不会在当前日期为29日，游戏日期是下个月的第3天的边缘情况下这样做。

You are probably wondering why I don't just get the date of the game (8) and subtract the current date (19). I don't do that in the edge case that the current date is the 29th and the game date is the 3rd of the next month.

推荐答案

尝试使用 TimeUnit ：

final String gameDate = "2016-03-19T19:45:00Z";
final SimpleDateFormat apiFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'", Locale.US);
apiFormat.setTimeZone(TimeZone.getTimeZone("CET"));
final Date dateOfGame = apiFormat.parse(gameDate);
final long millis = dateOfGame.getTime() - System.currentTimeMillis();
System.out.println(dateOfGame.getTime() - System.currentTimeMillis());

final String hms = String.format("%02d:%02d:%02d", TimeUnit.MILLISECONDS.toHours(millis),
                TimeUnit.MILLISECONDS.toMinutes(millis) - TimeUnit.HOURS.toMinutes(TimeUnit.MILLISECONDS.toHours(millis)),
                TimeUnit.MILLISECONDS.toSeconds(millis) - TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(millis)));
System.out.println(hms);

这将打印输出：

72:57:34

72:57:34

从现在起72小时57分34秒直到gameDate

72 hours, 57 minutes and 34 seconds from now until gameDate

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