Convert NSDate in12 Hour Format To 24 Hour Format

Question

I have an NSDate Object which is in 12 hour format like 2014-09-16 04:40:05 pm +0000.

I want to convert this into 24 hour format and want to get back an NSDate object like 2014-09-16 16:40:05 +0000.

Can some one guide me in doing that.

So i want some method like :

-(NSDate *) get24HourFormat:(NSDate *) date{

  return date object;
}

... and 5000 other questions. – trojanfoe Sep 16 '14 at 12:32 — trojanfoe, Sep 16 '14 at 12:32

score 5 · Answer 1 · answered Sep 16 '14 at 12:25

5

Simple use this:

 NSDateFormatter *dateformate=[[NSDateFormatter alloc]init];
 dateformate.dateFormat = @"HH:mm a"; // Date formater
 NSString *timeString = [dateformate stringFromDate:[NSDate date]]; // Convert date to string
 NSLog(@"timeString :%@",timeString);

Logic: Simply convert date format hh:mm to HH:mm

answered Sep 16 '14 at 12:25

Soumya Ranjan

4,817
2
26
51

so what i want is if its 3:30 pm then i should get 15:30 and no am or pm. – Abdul Samad Sep 16 '14 at 12:35
ya dude. just delete "a". write only HH:mm. "a" for am/pm – Soumya Ranjan Sep 16 '14 at 12:36
NSDateFormatter *dateformate=[[NSDateFormatter alloc]init]; dateformate.dateFormat = @"yyyy-MM-dd HH:mm:ss"; // Date formater NSString *timeString = [dateformate stringFromDate:[NSDate date]]; // Convert date to string NSLog(@"timeString :%@",timeString); – Abdul Samad Sep 16 '14 at 12:39
its not working still giving me 3:38 pm – Abdul Samad Sep 16 '14 at 12:40
clean your code and run. My output is: timeString :2014-09-16 18:11:40 – Soumya Ranjan Sep 16 '14 at 12:42
You got it or still u r struggling ? – Soumya Ranjan Sep 16 '14 at 12:44
still struggling... is your iphone is 12 hourb format or 24 hour – Abdul Samad Sep 16 '14 at 12:55
12 hr format. in my device and simulator also its working fine. check ur code and ur device format – Soumya Ranjan Sep 16 '14 at 12:55

score 2 · Answer 2 · edited Sep 16 '14 at 13:46

There seems to be a deep misunderstanding here what NSDate is and does.

An NSDate object is a point in time in UTC. It doesn't have a time zone. It doesn't have a format. It has nothing. You can't change its format, it doesn't even make any sense.

What you can do is to use an NSDateFormatter to convert the NSDate to a string. By default, NSDateFormatter uses your local time zone, which means for most people that the result will be different from the result that NSLog would show for an NSDate. In the NSDateFormatter, you can use whatever settings you want.

Usually you would respect how the user set up his date formatting and not change it for anything that is visible to the user. As a user, if I had set up my device to show days in 12 hour format, I'd be very annoyed if your application worked differently.

score -1 · Answer 3 · answered Sep 16 '14 at 12:18

-1

try this..

 -(NSString *)changeformate_string24hr:(NSString *)date
{

    NSDateFormatter* df = [[NSDateFormatter alloc]init];

    [df setTimeZone:[NSTimeZone systemTimeZone]];

    [df setDateFormat:@"MM/dd/yyyy hh:mm:ss a"];

    NSDate* wakeTime = [df dateFromString:date];

    [df setDateFormat:@"MM/dd/yyyy HH:mm:ss"];


    return [df stringFromDate:wakeTime];

}

-(NSString *)changeformate_string12hr:(NSString *)date
{

    NSDateFormatter* df = [[NSDateFormatter alloc]init];

    [df setTimeZone:[NSTimeZone systemTimeZone]];

    [df setDateFormat:@"MM/dd/yyyy HH:mm:ss"];

    NSDate* wakeTime = [df dateFromString:date];

    [df setDateFormat:@"MM/dd/yyyy hh:mm:ss a"];

    return [df stringFromDate:wakeTime];

}

answered Sep 16 '14 at 12:18

hmdeep

2,910
3
14
22

How can i convert my date to string... – Abdul Samad Sep 16 '14 at 12:23
NSString *stringFromDate = [formatter stringFromDate:yourDate]; – hmdeep Sep 16 '14 at 12:24
NSDateFormatter *formatter = [[NSDateFormatter alloc]init]; [formatter stringFromDate:yourDate]; is not working in the above method it returns nil – Abdul Samad Sep 16 '14 at 12:27
in above method they return string, so no need to convert... – hmdeep Sep 16 '14 at 12:28
Use my method u can easily get a date in string @Abdul Samad – Soumya Ranjan Sep 16 '14 at 12:30

Convert NSDate in12 Hour Format To 24 Hour Format

3 Answers3