I am trying to convert a string to date but NSDateFormatter returns nil for a specific date. In the code below all string are converted to Date except for date2 and date7. Any pointers as to what is wrong? Thanks 	let date1 = "Jan 01, 1941" 				let date2 = "Oct 01, 1941" 				let date3 = "Oct 13, 1941" 				let date4 = "Sep 30, 1941" 				let date5 = "Mar 31, 1941" 				let date6 = "Oct 02, 1941" 				let date7 = "Oct 01, 1941" 				 				let dateStringFormatter = DateFormatter() 				dateStringFormatter.dateFormat = "MMM dd, yyyy" //Using custom 				dateStringFormatter.locale = Locale(identifier: "en_US_POSIX") 				let date_1 : Date? = dateStringFormatter.date(from: date1) 				let date_2 : Date? = dateStringFormatter.date(from: date2) 				let date_3 : Date? = dateStringFormatter.date(from: date3) 				let date_4 : Date? = dateStringFormatter.date(from: date4) 				let date_5 : Date? = dateStringFormatter.date(from: date5) 				let date_6 : Date? = dateStringFormatter.date(from: date6) 				let date_7 : Date? = dateStringFormatter.date(from: date7) 				print("\(String(describing: date_1)),\n\(String(describing: date_2)),\n\(String(describing: date_3)),\n\(String(describing: date_4)),\n\(String(describing: date_5)),\n\(String(describing: date_6)),\n\(String(describing: date_7))")