Question

I have a date in my application which has this format :

"MMM dd, yyyy hh:mm:ss a"

The user chooses a day from a picker and the date is always converted to this format. From this format how can i get the date after exactly 24 hours?

For example if the date is Mon 24 , 2012 17:44:33 i need the code to transform it to Tue 25 , 2012 17:44:33.

Answer 1

Use the following code to create a NSDate from your string:

NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setTimeZone:[NSTimeZone localTimeZone]];
[dateFormatter setCalendar:[NSCalendar currentCalendar]];
[dateFormatter setDateFormat:<FORMAT_OF_DATE_STRING>];
NSDate *date = [dateFormatter dateFromString:<DATE_STRING>];
[dateFormatter release];

Use the following code to add days to a NSDate:

    NSDate *today =<YOUR_DATE>        
    NSCalendar *gregorian = [[NSCalendar alloc]
                             initWithCalendarIdentifier:NSGregorianCalendar];
    /*
     Create a date components to represent the number of days to add to the current date.         
     The weekday value for Sunday in the Gregorian calendar is 1, so add 1 from the number of days to subtract from the date in question.  (If today is Sunday, add 0 days.)    
     */
    NSDateComponents *componentsToAdd = [[NSDateComponents alloc] init];

    if(day<7)
    {
       [componentsToAdd setDay: day];
    }

    NSDate *calculateDay = [gregorian dateByAddingComponents:componentsToAdd
                                                      toDate:today options:0];

Happy coding!