Question

NSString* dateString = @"2012-04-01T15:37:53Z";

ISO8601DateFormatter *dateFormat = [[ISO8601DateFormatter alloc] init];
[dateFormat setIncludeTime:YES];
NSTimeZone *utcTimeZone = [NSTimeZone timeZoneWithName:@"UTC"];

NSDate* date = [dateFormat dateFromString:dateString timeZone:&utcTimeZone];

STAssertEqualObjects([dateFormat stringFromDate:date timeZone:utcTimeZone], dateString, nil, nil);

The above test fails with

‘2012-04-01T16:37:53Z’ should be equal to ‘2012-04-01T15:37:53Z’

Not sure why the NSString returned by the stringFromDate:date is 1 hour later since both dates are using UTC.

Answer 1

Looks like there is a bug in the #stringFromDate that has been resolved in a fork.