NSDateFormatter的dateFromString：在iOS 11中返回nil

Question

I've this code:

NSDateFormatter *dateFormatter = [NSDateFormatter new];
dateFormatter.dateStyle = NSDateFormatterLongStyle;
dateFormatter.timeStyle = NSDateFormatterLongStyle;

NSDate *myDate = [dateFormatter dateFromString:@"2016-03-01 13:42:17"];

For < iOS 11 , expected date is found, but for iOS 11 (Tested in iPhone with iOS 11.1) this is returning nil .

I didn't see any API changes for dateFromString: in Apple's doc. What's wrong?

Answer 1

Basically do not use the date / time styles to convert a date string. The styles represent different strings in different locales.

Use a fixed date format instead and set the locale to en_US_POSIX :

NSDateFormatter *dateFormatter = [NSDateFormatter new];
dateFormatter.locale = [NSLocale localeWithLocaleIdentifier:@"en_US_POSIX"];
dateFormatter.dateFormat = @"yyyy-MM-dd HH:mm:ss";

NSDate *myDate = [dateFormatter dateFromString:@"2016-03-01 13:42:17"];

Answer 2

@Vadian's answer worked for me in Swift as well! Thanks! :)

Here's the Swift version:

let dateFormatter = DateFormatter()
dateFormatter.locale = Locale(identifier: "en_US_POSIX")
dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss"

Date myDate = dateFormatter.date(from: "2016-03-01 13:42:17")