CODEWITHSUNDEEP
objective-ciosdatetimensdatensdateformatter
Sergey
Sergey

Reputation: 1208

NSDateFormatter in 12-hour mode

I have the following code.

NSDateFormatter *df = ...;
[df setTimeZone:[NSTimeZone defaultTimeZone]];
[df setDateFormat:@"yyyy-MM-dd'T'HH:mm:ss.SSSZZZ"];
NSDate * date = [df dateFromString:date_string]; //here is the problem

In 24-hour mode everything is ok. When 12-hour mode is set on device, stringFromDate returns null. Format of date_string is the same all the time, date format too. Why does it happen?

Upvotes: 28

Views: 15878

Answers (4)

Sagar Desai
Sagar Desai

Reputation: 347

NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
NSLocale *locale = [[[NSLocale alloc] 
                initWithLocaleIdentifier:@"en_US_POSIX"] autorelease];  
[dateFormat setLocale:locale];

Upvotes: 4

Luis Ascorbe
Luis Ascorbe

Reputation: 2099

12-hour mode to 24 hour mode:

NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"hh:mm a"];
NSDate *amPmDate = [formatter dateFromString:amPmHourString];
[formatter setDateFormat:@"HH:mm"];
NSString *24HourString = [formatter stringFromDate:amPmDate]];

For 24-hour mode to 12 hour mode just do the opposite

Upvotes: 6

aleroot
aleroot

Reputation: 72636

Try to set the locale in this way : 

NSLocale *twelveHourLocale = [[NSLocale alloc] initWithLocaleIdentifier:@"en_US_POSIX"];
df.locale = twelveHourLocale;

To force instead to 24 hour, you can use : 

NSLocale *twentyFour = [[NSLocale alloc] initWithLocaleIdentifier:@"en_GB"];

Upvotes: 37

Omar Abdelhafith
Omar Abdelhafith

Reputation: 21221

In your NSDateFormatter "yyyy-MM-dd'T'HH:mm:ss.SSSZZZ" HH stands for 24 hour and hh stands for 12 hour

Upvotes: 56

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