NSDateFormater from NSMutableArray value - iphone

Question

I store some dates in my NSMutableArray, I want to retrieve them and change the format.
For the moment I do this:
NSDate *myDate = [self.dates objectAtIndex:0];
NSLog(#"myDate:%#", myDate); // 2010-03-02
NSDateFormatter *formatDate = [[NSDateFormatter alloc] init];
[formatDate setDateFormat:#"MMMM d YYYY"];
NSString *newDate = [formatDate stringFromDate:myDate];
NSLog(#"newDate: %#", newDate); // NULL
the result for newDate is NULL, and I want it to be something like that: "March 3, 2010"
thanks,

Answer 1

That works for me, but I replaced the first line with:
NSDate *myDate = [NSDate date];
My output:
2010-03-02 19:29:08.045 app[11464:a0f] myDate:2010-03-02 19:29:08 -0800
2010-03-02 19:29:08.048 app[11464:a0f] newDate: March 2 2010
My best guess is that [self.dates objectAtIndex:0] isn't returning what you want it to.

Answer 2

Since your dates array contains strings, you have to convert the string to an NSDate and then you can re-convert the date to the format you want.
NSDateFormatter *strToDateFmt = [[NSDateFormatter alloc] init];
[strToDateFmt setDateFormat:#"yyyy-MM-dd"];
NSDate *myDate = [strToDateFmt dateFromString:[self.dates objectAtIndex:0]];
[strToDateFmt release];
NSLog(#"myDate:%#", myDate);
NSDateFormatter *formatDate = [[NSDateFormatter alloc] init];
[formatDate setDateFormat:#"MMMM d YYYY"];
NSString *newDate = [formatDate stringFromDate:myDate];
[formatDate release];
NSLog(#"newDate: %#", newDate);