Java 将 X 小时添加到日期和时间
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Add X hours to a date & time
提问by user2911924
I am currently fetching the time and date trough:
我目前正在获取时间和日期低谷：
DateFormat dateFormat = new SimpleDateFormat("MM/dd/yyyy HH:mm:ss");
Date date = new Date();
System.out.println(dateFormat.format(date));
This returns the example '05/14/2014 01:10:00'
这将返回示例 '05/14/2014 01:10:00'
Now I am trying to make it so I can add a hour to this time without having to worry about a new day or month etc.
现在我正在努力做到这一点，这样我就可以在这个时间上增加一个小时，而不必担心新的一天或一个月等。
How would I go on getting '05/14/2014 01:10:00' but then for 10 hours later in the same format?
我将如何继续获得 '05/14/2014 01:10:00' 但在 10 小时后以相同的格式？
Thanks in advance.
提前致谢。
采纳答案by Robert Durgin
回答by mrres1
DateFormat dateFormat = new SimpleDateFormat("MM/dd/yyyy HH:mm:ss");
Date date = new Date();
System.out.println(dateFormat.format(date));
/*
* Add x hours to the time
*/
int x = 10;
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
calendar.add(Calendar.HOUR, x);
System.out.println(dateFormat.format(calendar.getTime()));
Console output:
控制台输出：
05/08/2014 20:34:18
05/09/2014 06:34:18
回答by VGR
As others have mentioned, the Calendar class is designed for this.
正如其他人所提到的，Calendar 类就是为此而设计的。
As of Java 8, you can also do this:
从 Java 8 开始，您还可以这样做：
DateTimeFormatter dateFormat =
DateTimeFormatter.ofPattern("MM/dd/yyyy HH:mm:ss");
LocalDateTime date = LocalDateTime.now();
System.out.println(dateFormat.format(date));
System.out.println(dateFormat.format(date.plusHours(10)));
java.time.format.DateTimeFormatteruses a lot of the same pattern letters as java.text.SimpleDateFormat, but they are not all the same. See the DateTimeFormatter javadocfor the details.
java.time.format.DateTimeFormatter使用许多与 相同的模式字母java.text.SimpleDateFormat，但它们并不完全相同。有关详细信息，请参阅DateTimeFormatter javadoc。
回答by Ashish John
DateFormat dateFormat = new SimpleDateFormat("MM/dd/yyyy HH:mm:ss");
Date currentDate = new Date();
final long reqHoursInMillis = 1 * 60 * 60 * 1000; // change 1 with required hour
Date newDate = new Date(currentDate.getTime() + reqHoursInMillis);
System.out.println(dateFormat.format(newDate));
This will add 1 hour in current time in the given date format. Hope it helps.
这将以给定的日期格式在当前时间增加 1 小时。希望能帮助到你。
