Java 如何使用 Joda-Time 计算从现在起经过的时间？
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How to calculate elapsed time from now with Joda-Time?
提问by fabien7474
I need to calculate the time elapsed from one specific date till nowand display it with the same format as StackOverflow questions, i.e.:
我需要计算从一个特定日期到现在所经过的时间，并以与 StackOverflow 问题相同的格式显示它，即：
15s ago
2min ago
2hours ago
2days ago
25th Dec 08
Do you know how to achieve it with the Java Joda-Timelibrary? Is there a helper method out there that already implements it, or should I write the algorithm myself?
您知道如何使用 Java Joda-Time库实现它吗？是否有已经实现它的辅助方法，还是我应该自己编写算法？
采纳答案by BalusC
To calculate the elapsed time with JodaTime, use Period. To format the elapsed time in the desired human representation, use PeriodFormatterwhich you can build by PeriodFormatterBuilder.
要使用 JodaTime 计算经过的时间，请使用Period. 要在所需的人类表示中格式化经过的时间，请使用PeriodFormatter您可以构建的PeriodFormatterBuilder.
Here's a kickoff example:
这是一个启动示例：
DateTime myBirthDate = new DateTime(1978, 3, 26, 12, 35, 0, 0);
DateTime now = new DateTime();
Period period = new Period(myBirthDate, now);
PeriodFormatter formatter = new PeriodFormatterBuilder()
.appendSeconds().appendSuffix(" seconds ago\n")
.appendMinutes().appendSuffix(" minutes ago\n")
.appendHours().appendSuffix(" hours ago\n")
.appendDays().appendSuffix(" days ago\n")
.appendWeeks().appendSuffix(" weeks ago\n")
.appendMonths().appendSuffix(" months ago\n")
.appendYears().appendSuffix(" years ago\n")
.printZeroNever()
.toFormatter();
String elapsed = formatter.print(period);
System.out.println(elapsed);
This prints by now
这现在打印
3 seconds ago 51 minutes ago 7 hours ago 6 days ago 10 months ago 31 years ago
(Cough, old, cough)You see that I've taken months and years into account as well and configured it to omit the values when those are zero.
（咳，老，咳）你看，我也考虑了几个月和几年，并将其配置为在这些值为零时省略这些值。
回答by sfussenegger
回答by snappieT
You can do this with a PeriodFormatter but you don't have to go to the effort of making your own PeriodFormatBuilder as in other answers. If it suits your case, you can just use the default formatter:
您可以使用 PeriodFormatter 来做到这一点，但您不必像其他答案一样努力制作自己的 PeriodFormatBuilder 。如果它适合你的情况，你可以使用默认的格式化程序：
Period period = new Period(startDate, endDate);
System.out.println(PeriodFormat.getDefault().print(period))
(hat tip to this answeron a similar question, I'm cross-posting for discoverability)
（对类似问题的这个答案的提示，我交叉发布以提高可发现性）
回答by Joshua Pinter
Use PrettyTimefor Simple Elapsed Time.
使用PrettyTime表示简单的经过时间。
I tried HumanTimeas @sfussenegger answered and using JodaTime's Periodbut the easiest and cleanest method for human readable elapsed time that I found was the PrettyTimelibrary.
我在@sfussenegger 回答并使用 JodaTime 时尝试了HumanTime，Period但我发现的人类可读经过时间的最简单和最干净的方法是PrettyTime库。
Here's a couple of simple examples with input and output:
下面是几个带有输入和输出的简单示例：
Five Minutes Ago
五分钟前
DateTime fiveMinutesAgo = DateTime.now().minusMinutes( 5 );
new PrettyTime().format( fiveMinutesAgo.toDate() );
// Outputs: "5 minutes ago"
Awhile Ago
不久以前
DateTime birthday = new DateTime(1978, 3, 26, 12, 35, 0, 0);
new PrettyTime().format( birthday.toDate() );
// Outputs: "4 decades ago"
CAUTION:I've tried playing around with the library's more precise functionality, but it produces some odd results so use it with care and in non-life threatening projects.
注意：我曾尝试使用库的更精确的功能，但它会产生一些奇怪的结果，因此请谨慎使用它并在非危及生命的项目中使用它。
JP
J.P
