Validating Dates in dd-MMM-yyyy format

Less magic, more readable, would be:

DateTime dt1;
DateTime dt2;
if (DateTime.TryParseExact(str1, "dd-MMM-yyyy", null, DateTimeStyles.None, out dt1) &&
    DateTime.TryParseExact(str2, "dd-MMM-yyyy", null, DateTimeStyles.None, out dt2)) {
	// do something with those datetimes
}