dateFromString always returns null with dateformatter
Solution 1
Are you doing this in a background thread? I had weird experiences with NSDateFormatter when not being used in the ui-thread. Anyway, here's the method I use, should work for you:
+ (NSDate*)parseDate:(NSString*)inStrDate format:(NSString*)inFormat {
NSDateFormatter* dtFormatter = [[NSDateFormatter alloc] init];
[dtFormatter setLocale:[NSLocale systemLocale]];
[dtFormatter setDateFormat:inFormat];
NSDate* dateOutput = [dtFormatter dateFromString:inStrDate];
[dtFormatter release];
return dateOutput;
}
Solution 2
If the device is set to AM/PM time and requested string format is set to @"yyyy-MM-dd HH:mm:ss"
dateFromString
will return nil
.
If you set the locale to @"en_US"
conversion will return correct date.
dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setTimeZone:[NSTimeZone timeZoneWithName:@"GMT"]];
[dateFormat setLocale:[[NSLocale alloc] initWithLocaleIdentifier:@"en_US"]];
[dateFormat setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
NSDate *date = [dateFormat dateFromString:@"2013-02-14 09:30:00"];
Solution 3
I had the same issue. I started by double-checking that the string used for conversion was valid by using this resource.
I then had a thought that it might be the locale, so I tried the following:
[dateFomatter setLocale:[[NSLocale alloc] initWithLocaleIdentifier:@"en_AU"]]
It worked like a charm. Hope this helps.
Solution 4
I just ran this code and it worked for me.
NSDateFormatter * df = [[NSDateFormatter alloc] init];
[df setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
[df setTimeZone:[NSTimeZone systemTimeZone]];
[df setFormatterBehavior:NSDateFormatterBehaviorDefault];
NSDate *theDate = [df dateFromString:@"2011-04-12 10:00:00"];
NSLog(@"date: %@", theDate);
The output was: date: 2011-04-12 17:00:00 +0000
Solution 5
Yes, agreed with @Jan Gressmann, this is so wierd! I am using the NSDateFormatter on non-ui thread as well, and dateFromString selector returns null sometimes... For example, I have this code:
NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
NSLocale *usLocale = [[NSLocale alloc] initWithLocaleIdentifier:@"en_US"];
[dateFormat setLocale:usLocale];
[dateFormat setDateFormat:@"dd MMM yy HH:mm:ss"];
NSDate *startDate = [dateFormat dateFromString:str_StartDate];
NSDate *endDate = [dateFormat dateFromString:str_endDate];
Output in console:
(lldb) po str_StartDate
(NSString *) $7 = 0x06da2180 03 SEP 2012 10:00:00
(lldb) po str_endDate
(NSString *) $8 = 0x06d3a810 08 SEP 2013 10:00:00
(lldb) po startDate
(NSDate *) $9 = 0x00000000 <nil>
(lldb) po endDate
(NSDate *) $10 = 0x06db05b0 2013-09-08 02:00:00 +0000
This is really wierd...
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aherlambang
iOS and web developer passionate on building apps
Updated on December 15, 2020Comments
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aherlambang over 3 years
I have the following code:
NSDateFormatter * df = [[NSDateFormatter alloc] init]; [df setDateFormat:@"yyyy-MM-dd HH:mm:ss"]; [df setTimeZone:[NSTimeZone systemTimeZone]]; [df setFormatterBehavior:NSDateFormatterBehaviorDefault]; [df dateFromString:@"2011-04-12 10:00:00"];
In which it always generates a null date. Why is this?
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XJones about 13 yearsLooks like the same question you asked yesterday but simplified. You should modify the original question. Some of us spent a lot of time trying to help you. stackoverflow.com/questions/5628062/…
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NWCoder about 13 yearsDid you forget the: NSDate *theDate =
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Jasper about 10 yearsEven doing a check and setting the format to "hh:mm a" does not work. This does. Thanks!
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Vladimir almost 9 yearsSettings time zone with abbreviation "UTC" helped me. Thx