random random - 10 months ago 84
Objective-C Question

Convert ISO 8601 to NSDate

I have a timestamp coming from server that looks like this:


I've tried removing the colons, I've tried all of these:

Converting an ISO 8601 timestamp into an NSDate: How does one deal with the UTC time offset?

Why NSDateFormatter can not parse date from ISO 8601 format

Here is where I am at:

+ (NSDate *)dateUsingStringFromAPI:(NSString *)dateString {

NSDateFormatter *dateFormatter;
dateFormatter = [[NSDateFormatter alloc] init];

//@"yyyy-MM-dd'T'HH:mm:ss'Z'" - doesn't work
//@"yyyy-MM-dd'T'HH:mm:ssZZZ" - doesn't work
//@"yyyy-MM-dd'T'HH:mm:sss" - doesn't work

[dateFormatter setDateFormat:@"yyyy-MM-dd'T'HH:mm:ss'Z'"];
[dateFormatter setTimeZone:[NSTimeZone timeZoneWithName:@"GMT"]];

// NSDateFormatter does not like ISO 8601 so strip the milliseconds and timezone
dateString = [dateString substringWithRange:NSMakeRange(0, [dateString length]-5)];

return [dateFormatter dateFromString:dateString];

One of my biggest questions is, is the date format I have above really ISO 8601? All the examples I have seen from people the formats of each are slightly different. Some have
, others don't have anything at the end.

Answer Source

This works for me:

NSString *dateString = @"2013-04-18T08:49:58.157+0000";
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"yyyy-MM-dd'T'HH:mm:ss.SSSZ"];
// Always use this locale when parsing fixed format date strings
NSLocale *posix = [[NSLocale alloc] initWithLocaleIdentifier:@"en_US_POSIX"];
[formatter setLocale:posix];
NSDate *date = [formatter dateFromString:dateString];
NSLog(@"date = %@", date);