如何比较iphone中的两个日期?

问题描述

我想比较今天的日期和来自我的数据库的其他日期.例如，2011-03-25 与 2011-02-25 比较

I want to compare the todays date and other date coming from my database. For example, 2011-03-25 compare it with 2011-02-25

由于 NSDateFormatter 需要 NSDdate 数据类型，我如何格式化我的数据库日期?

How can i formate my database date as the NSDateFormatter require NSDdate datatype ?

推荐答案

Cocoa 有两种方法:

在 NSDate 中

– isEqualToDate:
– 较早日期:
– 稍后日期:
– 比较:

– isEqualToDate:
– earlierDate:
– laterDate:
– compare:

当你使用 - (NSComparisonResult)compare:(NSDate *)anotherDate 时，你会得到其中之一:

When you use - (NSComparisonResult)compare:(NSDate *)anotherDate ,you get back one of these:

The receiver and anotherDate are exactly equal to each other, NSOrderedSame
The receiver is later in time than anotherDate, NSOrderedDescending
The receiver is earlier in time than anotherDate, NSOrderedAscending.

有关更多信息，请阅读 SO 帖子

for more read the SO post

浏览一下博文，有很多与日期相关的实用功能.

Just go through the blog post, there are many date related utility functions.

http://arstechnica.com/apple/guides/2010/03/how-to-real-world-dates-with-the-iphone-sdk.ars/2

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