问题
I have a date string as follows: "Fri, 17 Jun 2011 19:20:51 PDT" which I need to parse into an NSDate format.
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc]init];
[dateFormatter setDateFormat:@"EEE, d MM YYYY HH:mm:ss zzz"];
NSDate *date = [dateFormatter dateFromString:currentPubDate ];
[dateFormatter release];
The code doesn't appear to be working and I am not sure why. I have looked into the issue but searching through forums etc and can't seem to find an answer. I do believe it is an issue with the dateFormatter. Thanks for your help
回答1:
You incorrectly specified your setDateFormat string. This is how you should have specified it:
[dateFormatter setDateFormat:@"EEE, dd MMM yyyy HH:mm:ss zzz"];
YYYY is only used in the "Week date" format used for some industrial and commercial applications. It looks like this: YYYY-Www-D where 2011-W1-3 would equate to the third day of the first week of 2011.
The Apple docs note that it is a common mistake to use YYYY instead of yyyy: Fixed Formats
回答2:
Try replacing MM with MMM -- I dont have XCode handy to verify but typically "M" or "MM" will refer to numeric month. In your case since you have "Jun" you should try MMM.
回答3:
You can also do the following:
NSDateFormatter has the properties: dateStyle & timeStyle
You can set these to NSDateFormatterNoStyle, NSDateFormatterShortStyle, NSDateFormatterMediumStyle, NSDateFormatterLongStyle, NSDateFormatterFullStyle
Once these are set you can use stringFromDate: to get a nicely formatted string.
Check out the documentation page for each style does to the time and date.
https://developer.apple.com/library/mac/documentation/Cocoa/Reference/Foundation/Classes/NSDateFormatter_Class/Reference/Reference.html#//apple_ref/c/tdef/NSDateFormatterStyle
Cheers!
来源：https://stackoverflow.com/questions/6399365/nsdate-formatting