block13.kt

sealed class ParsedDate {
	 data class Success(val date: Date) : ParsedDate()
	 data class Failure(val errorOffset: Int) : ParsedDate()
}

fun DateFormat.tryParse(text: String): ParsedDate =
	 try {
		 ParsedDate.Success(parse(text))
	 } catch (e: ParseException) {
		 ParsedDate.Failure(e.errorOffset)
	 }