如何计算iOS中两个日期之间的小时数 [英] How to calculate time in hours between two dates in iOS

问题描述

如何计算iOS中两次（可能在不同日期发生）之间的小时数？

How can I calculate the time elapsed in hours between two times (possibly occurring on different days) in iOS?

推荐答案

NSDate 函数 timeIntervalSinceDate：将为您提供两个日期的差异，以秒为单位。

The NSDate function timeIntervalSinceDate: will give you the difference of two dates in seconds.

 NSDate* date1 = someDate;
 NSDate* date2 = someOtherDate;
 NSTimeInterval distanceBetweenDates = [date1 timeIntervalSinceDate:date2];
 double secondsInAnHour = 3600;
 NSInteger hoursBetweenDates = distanceBetweenDates / secondsInAnHour;

请参阅苹果参考库 http://developer.apple.com/library/mac/navigation/
或者如果您使用的是Xcode只需从菜单中选择帮助/文档。

请参阅：如何转换-nstimeinterval-seconds-into-minutes

- 编辑：请参阅下面的ÐąrέÐέvil的答案，以正确处理夏令时/闰秒

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