Java JodaTime 相当于 DateUtils.truncate()
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JodaTime equivalent of DateUtils.truncate()
提问by Sean Patrick Floyd
I have never used JodaTimebefore, but answering this question, How to get ordinal Weekdays in a Month.
我以前从未使用过JodaTime，但回答了这个问题，How to get ordinal Weekdays in a Month。
I tried it and came up with this ugly code to unset all fields below day:
我试了一下，想出了这个丑陋的代码来取消以下所有字段的设置：
DateTime startOfMonth =
input.withDayOfMonth(1)
.withHourOfDay(0) // there
.withMinuteOfHour(0) // has got to
.withSecondOfMinute(0) // be a shorter way
.withMillisOfSecond(0); // to do this
Where the Commons / Langequivalent using DateUtilswould be
Date startOfMonth = DateUtils.truncate(input, Calendar.MONTH);
What's the preferred idiom to do that in JodaTime?
在 JodaTime 中这样做的首选习语是什么？
采纳答案by Soundlink
You can use roundFloorCopy()to mimic DateUtils.truncate
您可以使用roundFloorCopy ()来模仿 DateUtils.truncate
Date truncateMonth = DateUtils.truncate(input, Calendar.MONTH);
-> DateTime truncateMonth = input.dayOfMonth().roundFloorCopy();
Date truncateMinute = DateUtils.truncate(input, Calendar.MINUTE);
-> DateTime truncateMinute = input.minuteOfDay().roundFloorCopy();
Date truncateHourOfDay = DateUtils.truncate(input, Calendar.HOUR_OF_DAY);
-> DateTime truncateHourOfDay = input.hourOfDay().roundFloorCopy()
回答by Bozho
Take a look at DateMidnight.
看看DateMidnight。
DateTime startOfMonth = new DateTime(new DateMidnight(input.withDayOfMonth(1)));
Update: 2013-08-16 by JodaStephen: Version 2.3 of Joda-Time deprecates DateMidnightas it was a very bad idea of a class.
更新：2013-08-16 由 JodaStephen：Joda-Time 2.3 版已弃用，DateMidnight因为它是一个非常糟糕的类想法。
So use:
所以使用：
DateTime startOfMonth = input.withDayOfMonth(1).withTimeAtStartOfDay();
回答by Erick Robertson
Use the withMillisOfDay()method to shorten the syntax.
使用withMillisOfDay()方法来缩短语法。
DateTime startOfMonth = input.withDayOfMonth(1).withMillisOfDay(0);
回答by SpaceTrucker
Joda Time also supports the withFieldsmethod in the DateTimetype. This can also be used to create a short syntax:
Joda Time 还支持类型中的withFields方法DateTime。这也可用于创建简短的语法：
new DateTime().withDayOfMonth(1).withFields(new LocalTime(0, 0));
In production code the argument to withFieldsshould be factored out to a constant.
在生产代码中，参数 towithFields应该被分解为一个常量。
