How to sort the Array that contains date in strings in ascending order

Question

I have array of dictionaries ,In every dictionary contains one date parameter . The array of date parameters(contains in dictionaries) as follow:

 [@"16-1-2015 7:00PM",@"15-1-2014 11:30AM",@"14-1-2014 7:00PM",
 @"15-1-2015 6:30AM ".@"16-1-2015 8:30PM"]

I need output like :

[@"16-1-2015 8:30PM",@"16-1-2015 7:00PM",@"15-1-2015 6:30AM ",
@"15-1-2014 11:30AM",@"14-1-2014 7:00PM"];

@ravikanth manne please go through this link .hope it helps you...stackoverflow.com/questions/1132806/… — App Developer
– App Developer, Commented Feb 25, 2015 at 5:15

Huy Nghia · Accepted Answer · 2015-02-25 07:32:29Z

1

You could try this:

NSArray *dateStringArray = @[ @"16-1-2015 7:00PM", @"15-1-2014 11:30AM", @"14-1-2014 7:00PM", @"15-1-2015 6:30AM ", @"16-1-2015 8:30PM" ];

 - (NSArray *)sortDateStringArray:(NSArray *)dateStringArray
    {
        NSDateFormatter *dateFormater = [[NSDateFormatter alloc] init];
        [dateFormater setDateFormat:@"dd-MM-yyyy h:mma"];
        NSArray *sortedArray = [dateStringArray sortedArrayUsingComparator:^NSComparisonResult(NSString *obj1, NSString *obj2) {
          NSDate *date1 = [dateFormater dateFromString:obj1];
          NSDate *date2 = [dateFormater dateFromString:obj2];
          return [date2 compare:date1];
        }];
        return sortedArray;
    }

I think it better convert your dateString to NSDate then compare
Hope this help !!!

edited Feb 25, 2015 at 7:32

answered Feb 25, 2015 at 5:05

Huy Nghia

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2 Comments

David Berry Over a year ago

Note that if you swap the compare operands, you can eliminate the switch statement: return [date2 compare:date1]; Also note that constructing NSDateFormatter is an expensive operation, at a minimum it should be elevated to outside the block.

Shobhit C Over a year ago

Thanks man. Saved my day. @HuyNghia : Just a heads up, the above code is for sorting in descending order. To make it ascending sort, just replace date1 with date2 on this line: return [date2 compare:date1];

Community · Accepted Answer · 2017-05-23 12:20:44Z

Store the dates as NSDate objects in an NSMutableArray, then use -[NSArray sortedArrayUsingSelector:] or -[NSMutableArray sortUsingSelector:] and pass @selector(compare:) as the parameter. The -[NSDate compare:] method will order dates in ascending order for you. This is simpler than creating an NSSortDescriptor, and much simpler than writing your own comparison function. (NSDate objects know how to compare themselves to each other at least as efficiently as we could hope to accomplish with custom code.)

Or

If I have an NSMutableArray of objects with a field "beginDate" of type NSDate I am using an NSSortDescriptor as below:

NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"beginDate" ascending:TRUE];
[myMutableArray sortUsingDescriptors:[NSArray arrayWithObject:sortDescriptor]];
[sortDescriptor release];

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