```
NSMutableArray *dateMutablearray = [NSMutableArray array];
NSArray *array1 = @[@"2014-04-01",@"2014-04-02",@"2014-04-03",
@"2014-04-01",@"2014-04-02",@"2014-04-03",
@"2014-04-01",@"2014-04-02",@"2014-04-03",
@"2014-04-01",@"2014-04-02",@"2014-04-03",
@"2014-04-01",@"2014-04-02",@"2014-04-03",
@"2014-04-01",@"2014-04-02",@"2014-04-03",
@"2014-04-04",@"2014-04-06",@"2014-04-08",
@"2014-04-05",@"2014-04-07",@"2014-04-09",];
NSMutableArray *array = [NSMutableArray arrayWithArray:array1];
for (int i = 0; i < array.count; i ++) {
NSString *string = array[i];
NSMutableArray *tempArray = [NSMutableArray array];
[tempArray addObject:string];
for (int j = i+1; j < array.count; j ++) {
NSString *jstring = array[j];
if([string isEqualToString:jstring]){
[tempArray addObject:jstring];
[array removeObjectAtIndex:j];
j=j-1;
}
}
[dateMutablearray addObject:tempArray];
}
NSLog(@"array:%@",array);
NSLog(@"dateMutable:%@",dateMutablearray);
```
