CODEWITHSUNDEEP
iosobjective-cnsdate
Hilaj S L
Hilaj S L

Reputation: 2046

how to sort array of dates in ascending order in ios

I have a NSMutableArray that contains dates in string format. Here I need to sort that array in order of ascending order of dates. I used strong text

 NSSortDescriptor *descriptor=[[NSSortDescriptor alloc] initWithKey:@"self" ascending:YES];
 NSArray *descriptors=[NSArray arrayWithObject: descriptor];
 NSArray *reverseOrder=[dateArray sortedArrayUsingDescriptors:descriptors];

But it only sort the dates in terms of ascending order of day and month. Year is not considered. Please help me. For example, Array contains 

 03/09/2017, 03/06/2016, 01/06/2016,01/04/2016 and 03/01/2017.

After using the above lines of code, Array contains like,

 01/04/2018, 01/06/2016, 03/01/2017, 03/06/2016, 03/09/2016

Upvotes: 3

Views: 5871

Answers (5)

Sachin Daingade
Sachin Daingade

Reputation: 11

//You can change the date format according to your code

NSDateFormatter *df = [[NSDateFormatter alloc] init];
                      [df setDateFormat:@"MM/dd/yyyy"];

NSArray *sortedArray = [YourArraysortedArrayUsingComparator:^NSComparisonResult(NSDictionary *obj1, NSDictionary *obj2)
{
    NSString *strDateObj1  = [NSString stringWithFormat:@"%@",[obj1 valueForKey:@"BirthDate"]];
    NSString *strDateObj2  = [NSString stringWithFormat:@"%@",[obj2 valueForKey:@"BirthDate"]];
    NSDate *d1 = [df dateFromString: strDateObj1];
    NSDate *d2 = [df dateFromString: strDateObj2];
    return [d1 compare: d2];
}];

NSLog(@"%@", sortedArray)

Upvotes: 0

Mehsam Saeed
Mehsam Saeed

Reputation: 275

For Swift 4.0

let formater = DateFormatter()
    formater.dateFormat = "MM/dd/yyyy" //date formate should be according to your date formate
    let sortedArray=arrayToSort.sorted(){
        (obj1, obj2) in
        let date1=formater.date(from: obj1)
        let date2=formater.date(from: obj2)
        return date1!<date2!
    }

Upvotes: 0

Nirav D
Nirav D

Reputation: 72410

You need to use sortedArrayUsingComparator like this way to sort date with String array.

NSDateFormatter *df = [[NSDateFormatter alloc] init];
[df setDateFormat:@"MM/dd/yyyy"];
NSArray *sortedArray = [yourArray sortedArrayUsingComparator:^NSComparisonResult(NSString *obj1, NSString *obj2) {
    NSDate *d1 = [df dateFromString: obj1];
    NSDate *d2 = [df dateFromString: obj2];
    return [d1 compare: d2];
}];

Note : Set formate of date According to your date, it is hard to predicate date formate from your example thats why I have used MM/dd/yyyy, if your date contain formate dd/MM/yyyy then use that.

Upvotes: 8

BSB
BSB

Reputation: 277

Please try below code:

NSArray *strDateArray = [[NSArray alloc] initWithObjects:@"03/09/2017",@"03/06/2016", @"01/06/2016",@"01/04/2016",@"03/01/2017", nil];

    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
    [formatter setDateFormat:@"MM/dd/yyyy"];

    NSMutableArray *dateArray = [[NSMutableArray alloc] init];

    for (NSString *dateString in strDateArray) {
        NSDate *date = [formatter dateFromString:dateString];
        [dateArray addObject:date];
    }

    // sort array of dates
    [dateArray sortUsingComparator:^NSComparisonResult(NSDate *date1, NSDate *date2) {
        // return date1 compare date2 for ascending. And reverse the call for ascending.
        return [date1 compare:date2];
    }];

    NSLog(@"dateArray %@", dateArray);
    NSMutableArray *sortedDateArray = [[NSMutableArray alloc] init];

    for (NSDate *date in dateArray) {
        NSString *dateString = [formatter stringFromDate:date];
        [sortedDateArray addObject:dateString];
    }

    NSLog(@"sortedDateArray %@", sortedDateArray);

Upvotes: 1

Bhadresh Kathiriya
Bhadresh Kathiriya

Reputation: 3244

your code is correct but date format wrong.

try this code:

NSMutableArray *dateArray = [[NSMutableArray alloc] initWithArray: @[@"03/09/2017", @"03/06/2016", @"01/06/2016",@"01/04/2016", @"03/01/2017"]];
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
NSDate *date;
for (int i = 0; i < dateArray.count; i++) {
    [formatter setDateFormat:@"MM/dd/yyyy"];  // Please your date format set.
    date = [formatter dateFromString:[dateArray objectAtIndex:i]];
    [formatter setDateFormat:@"yyyy/MM/dd"];
    [dateArray replaceObjectAtIndex:i withObject:[formatter stringFromDate:date]];
}
NSSortDescriptor *descriptor=[[NSSortDescriptor alloc] initWithKey:@"self" ascending:YES];
NSArray *descriptors=[NSArray arrayWithObject: descriptor];
NSArray *reverseOrder=[dateArray sortedArrayUsingDescriptors:descriptors];

NSLog(@"Array: %@",reverseOrder);

Upvotes: 1

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