Open Radar

 
n the Europe/London timezone, for some years and times 24 hours after t winter to summer time transition, NSDateFormatter fails to convert a valid date string to an NSDate

source code follows the test results

Expected Results:
I expect to see a non-nil NSDate

Actual Results:
======= Begin Test
Comment: This should work - just an ordinary date
date to convert: 7aug14 20:12
result: 2014-08-07 19:12:00 +0000
======= Begin Test
Comment: This should return nil -daylight saving transition
date to convert: 27mar94 01:00
result: (null)
 ======= Begin Test
Comment: This should work (but fails)- 24 hours after transition
date to convert: 28mar94 01:00
result: (null)
======= Begin Test
Comment: This should work (and it does) - 24 hours after another transition
date to convert: 31mar14 01:00
result: 2014-03-31 00:00:00 +0000


Source code:
================ cut here ===================

// Command line tool to illustrate NSDateFormater dateFromString bug
// when processing dates 24 hours after a transition from 
// standard time to daylight saving time.

// Author: David Evans 
// Email: dave.evans55@googlemail.com
// Date: Tue 2 September 2014
// Compiled without ARC

#include <Foundation/Foundation.h>

void testone(NSString * comment, NSString * aDate){


  NSDateFormatter *df = [[NSDateFormatter alloc ]  init];
  NSLocale *enUSPOSIXLocale = [[NSLocale alloc] 
                                  initWithLocaleIdentifier:@"en_US_POSIX"];
  [df setLocale:enUSPOSIXLocale];
  [df setDateFormat: @"ddMMMyy HH:mm" ];
  [df setTimeZone: [NSTimeZone timeZoneWithName:@"Europe/London"]];
  NSLog(@"======= Begin Test");
  NSLog(@"Comment: %@", comment);
  NSLog(@"date to convert: %@", aDate);
  NSLog(@"result: %@", [[df dateFromString:aDate] description]);
  [enUSPOSIXLocale release];
  [df release];
  return;

}

int main(){
  @autoreleasepool {
    testone(@"This should work - just an ordinary date",
            @"7aug14 20:12");
    testone(@"This should return nil -daylight saving transition",
            @"27mar94 01:00");
    testone(@"This should work (but fails)- 24 hours after transition",
            @"28mar94 01:00");
    testone(@"This should work (and it does) - 24 hours after another transition",
            @"31mar14 01:00");

  } 
}
============== cut here ==============