From http://iosdevelopertips.com/cocoa/date-formatters-examples-take-3.html

NSDate to NSString

NSDate *date = [NSDate date];
NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:@"EEEE MMMM d, YYYY"];
NSString *dateString = [dateFormat stringFromDate:date];  
[dateFormat release];