1. 使用 NSDateFormatter 将日期字符串转换为 NSDate 对象。


2. 致电 - [NSDate timeIntervalSinceDate：] 以秒为单位获取两个日期之间的差异。


3. 除以60以分钟为单位获得差异。

1. Use NSDateFormatter to convert the date strings into NSDate objects.
2. Call -[NSDate timeIntervalSinceDate:] to get the difference between the two dates in seconds.
3. Divide by 60 to get the difference in minutes.

或者，您可以使用 NSCalendar 和 NSDateComponents 使用组件计算不同日历的分钟差异：fromDate：toDate：options ：方法。

Alternatively, you can use NSCalendar and NSDateComponents to calculate the difference in minutes for different calendars by using the components:fromDate:toDate:options: method.