To skip the CET (which I assume is a time zone) you can do this:
string Input = "Sun Feb 16 11:52:00 CET 2014";
DateTime Output;
if (DateTime.TryParseExact(Input, "ddd MMM dd hh:mm:ss \"CET\" yyyy", null, DateTimeStyles.None, out Output) == false)
Output = DateTime.MinValue;
There is a format/parse character (K) to the offset from Universal Time which tells me you should be using the offset, not the time zone abbreviation.
You can also check out the other DateTimeStyles...