主要问题是您 。
当我在西雅图的此处运行您的代码时,我会743
在2014年3月获得工作时间。为什么?由于我的默认时区。在美国西海岸的夏令时开始于2014年3月9日,星期日,02:00。参见本页,2014年时间更改日期。因此,第9天实际上是23小时而不是24小时。
但是,如果冰岛有人使用完全相同的代码,她会得到的744
。为什么?因为冰岛人民太聪明了,以至于不会理会夏令时。
同样,作为一个好习惯,withTimeAtStartOfDay()
当您尝试每天工作时,应调用Joda- Time方法。以前我们使用Joda- Time的midnight
方法,但是不赞成使用这些方法,因为某些日历中的某些日子没有午夜。
提示:请注意standard
文件名为的Joda-Time方法,该方法解释为每天24小时的假设。换句话说,这些方法忽略了夏时制。
这是在Java 7中使用Joda-Time 2.3的一些示例代码。
// © 2013 Basil Bourque. This source code may be used freely forevery by anyone taking full responsibility for doing so.
// Joda-Time - The popular alternative to Sun/Oracle's notorIoUsly bad date, time, and calendar classes bundled with Java 7 and earlier.
// http://www.joda.org/joda-time/
// Joda-Time will become outmoded by the JSR 310 Date and Time API introduced in Java 8.
// JSR 310 was inspired by Joda-Time but is not directly based on it.
// http://jcp.org/en/jsr/detail?id=310
// By default, Joda-Time produces strings in the standard ISO 8601 format.
// https://en.wikipedia.org/wiki/ISO_8601
// Time Zone list: http://joda-time.sourceforge.net/timezones.html
org.joda.time.DateTimeZone seattleTimeZone = org.joda.time.DateTimeZone.forID("America/Los_Angeles");
org.joda.time.DateTimeZone icelandTimeZone = org.joda.time.DateTimeZone.forID("Atlantic/Reykjavik");
// Switch between using 'seattleTimeZone' and 'icelandTimeZone' to see different results (23 vs 24).
org.joda.time.DateTime theNinth = new org.joda.time.DateTime( 2014, 3, 9, 0, 0, seattleTimeZone ) ; // Day when DST begins.
org.joda.time.DateTime theTenth = theNinth.plusDays( 1 ); // Day after DST begins.
// Using "hoursBetween()" method with a pair of DateTimes.
org.joda.time.Hours hoursObject = org.joda.time.Hours.hoursBetween( theNinth.withTimeAtStartOfDay(), theTenth.withTimeAtStartOfDay() );
int hoursInt = hoursObject.getHours();
System.out.println( "Expected 23 from hoursInt, got: " + hoursInt );
// Using an Interval.
org.joda.time.Interval interval = new Interval( theNinth.withTimeAtStartOfDay(), theTenth.withTimeAtStartOfDay() );
System.out.println( "Expected 23 from interval, got: " + org.joda.time.Hours.hoursIn(interval).getHours() );
// Using a Period with Standard days.
org.joda.time.Period period = new org.joda.time.Period( theNinth.withTimeAtStartOfDay(), theTenth.withTimeAtStartOfDay() );
org.joda.time.Hours standardHoursObject = period.toStandardHours();
System.out.println( "Expected 24 from standardHoursObject, got: " + standardHoursObject.getHours() );