NSString 到 NSDate [英] NSString to NSDate

问题描述

我得到了一个包含当前日期的字符串:

I got a string that contains the current date by using this :

NSString *date = [[NSDate date] description];

在另一个点我想从这个字符串中检索日期，我使用了以下代码:

At a different point I want to retrieve the date from this string and I used the following code:

[NSDateFormatter setDefaultFormatterBehavior:NSDateFormatterBehavior10_4];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
//[NSDateFormatter setDefaultFormatterBehavior:NSDateFormatterBehaviorDefault];
[dateFormatter setDateFormat:@"YYYY-MM-DD HH:MM:SS ±HHMM"];

NSDate *dateFromString = [[NSDate alloc] init];
dateFromString = [dateFormatter dateFromString:<NSString containing date>];

我得到 dateFromString 作为 nil 0x0.我做错了什么?

I am getting dateFromString as nil 0x0. What am I doing wrong?

推荐答案

您不能发明格式字符串语法并期望它起作用；您需要实际使用文档格式.(说真的，MM"同时表示月"、分钟"和GMT 偏移分钟"?)

You can't invent format string syntax and expect it to work; you need to actually use a documented format. (Seriously, "MM" meaning "month", "minute" and "GMT offset minutes" all at the same time?)

作为 文档 指出，10.4 格式化程序使用 Unicode 格式字符串.

As the documentation points out, the 10.4 formatters use Unicode format strings.

试试yyyy-MM-dd HH:mm:ss ZZZ".

Try "yyyy-MM-dd HH:mm:ss ZZZ" instead.

此外，Objective-C 源代码是 ASCII.不要把像 ± 这样的字符放在那里，并期望它在任何上下文中都能工作；相反，使用字符串文件.

Also, Objective-C source is ASCII. Don't put characters like ± in there and expect it to work in any context; instead, use strings files.

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