How to add NSmutable Array Values to NSarray

Iam pretty new to Objective c,Iam unable to add NSmutable array contents to NSarray here.

    - (void)viewDidLoad {

    markarry=[[NSMutableArray alloc]init];

HolidayAppDelegate *delegatObj = (HolidayAppDelegate *)[UIApplication sharedApplication].delegate;

for (int i=0;i<[delegatObj.Datearray count]; i++) {

    NSString *Str=[delegatObj.Datearray objectAtIndex:i];


    NSTimeZone *gmt = [NSTimeZone timeZoneWithAbbreviation:@"GMT"];
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:@"MMMM-dd-yyyy"];

    [dateFormatter setTimeZone:gmt];
    NSLocale *usLocale = [[NSLocale alloc] initWithLocaleIdentifier:@"en_US"];
    [dateFormatter setLocale:usLocale];
            NSDate *dateFromString;
    dateFromString = [dateFormatter dateFromSt开发者_开发技巧ring:Str];


    [markarry addObject:dateFromString];
    [dateFromString release];
    [Str release];

}


 }

I need to add markarry contents to the nsarray. Thanks

Very Simple

NSArray *newArray = [NSArray arrayWithArray:markarry];

UPDATE

Ok it seems your string is nil when you create it using dateformatter. Try to debug your app you will find the solution.[dateFormatter setDateFormat:@"MMMM-dd-yyyy"]; the format you are using here mmust be same as the string as. Otherwise you will get nil in your dateFromString object.