Question

I am having the following objective C code:

 NSString *dateStr = @"2012-09-21 05:00:00";

// Convert string to date object
NSDateFormatter *formatter2 = [[NSDateFormatter alloc] init];
[formatter2 setDateFormat:@"yyyy-MM-dd hh:mm:ss"];
NSDate *dateNew = [formatter2 dateFromString:dateStr];  
//NSLog(@"date new %@" , [dateNew description]);

NSDate *dateConverted = [dateNew dateByAddingTimeInterval:interval];
//NSLog(@"date converted=%@",dateConverted);

NSString *dateConvertedStr = [formatter2 stringFromDate:dateConverted];
NSLog(@"date conv str=%@",dateConvertedStr);

Here i am trying to first convert a date string into date object(dateNew). Then an interval is added to it to get new dateConverted. Lastly, this date object is converted to string again and printed.
But i am not getting desired results.
For eg: for given date string, if interval is 45000.00, then it is basically 12.5 hrs. So, my dateConvertedStr should give ‘2012-09-21 17:30:00’. But it is not giving desired results.
Can anybody suggest. Am i missing something.
Thanks in advance.

Answer 1

The problem here is the format string you supply. In your example (given that interval is 45000.00f) it returns date conv str=2012-09-21 5:30:00 because you use 12h based format.

Try this instead (note the capital H):

[formatter2 setDateFormat:@"yyyy-MM-dd HH:mm:ss"];

And now your dateConvertedStr is 2012-09-21 17:30:00 as expected.