Unexpected output from NSDate

问题:

when i try log out the current date i get date different from actual date :

NSLog(@"date %@",[NSDate date]);

output 2012-04-25 23:59:28 +0000

my machine time 2012-04-26 2:02 AM

any one knows how to fix this ? thanks

EDIT

here's what i get when using nsdataformatter

NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"yyyy-MM-dd hh:mm:ss"];
[formatter setTimeZone:[NSTimeZone defaultTimeZone]];
NSDate *date =[formatter dateFromString:[NSString stringWithString:@"2012-04-26 01:00:00"]];
 NSLog(@"date %@",date);

output : 2012-04-25 23:00:00 +0000 confusing !

回答1:

There's nothing to fix. NSLog is outputting the date in GMT/UTC. If you want it in your local timezone, you need to use NSDateFormatter.

回答2:

This should help you print the Local time and GMT time

  // gmt
  NSTimeZone *aTimeZone1 = [NSTimeZone localTimeZone];
  NSInteger aTimeInterval1 = -[aTimeZone1 secondsFromGMTForDate: [NSDate date]];
  NSLog(@"GMT: %@", [NSDate dateWithTimeInterval: aTimeInterval1 sinceDate: [NSDate date]]);

  // local
   NSTimeZone *aTimeZone2 = [NSTimeZone localTimeZone];
   NSInteger aTimeInterval2 = [aTimeZone2 secondsFromGMTForDate: [NSDate date]];
   NSLog(@"Local: %@", [NSDate dateWithTimeInterval: aTimeInterval2 sinceDate: [NSDate date]]);

AND

If you want to use NSDateFormatter then, how about trying this :

  NSDateFormatter *aDateFormatter = [[NSDateFormatter alloc] init];
  [aDateFormatter setTimeZone:[NSTimeZone timeZoneWithName:@"GMT"]];
  [aDateFormatter setDateFormat:@"dd:MM:yyyy HH:mm:ss"];
  NSLog(@"GMT: %@", [aDateFormatter stringFromDate:[NSDate date]]);

  [aDateFormatter setTimeZone:[NSTimeZone defaultTimeZone]];
  NSLog(@"Local: %@", [aDateFormatter stringFromDate:[NSDate date]]);