Consider using this line:
DateTime.ParseExact(Log.Date,
"MMM d HH:mm:ss",
CultureInfo.InvariantCulture,
DateTimeStyles.AllowWhiteSpaces);
Notice that I removed one of the spaces between the month and the day. That’s because AllowWhiteSpaces literally means:
Specifies that s may contain leading, inner, and trailing white spaces not defined by format.