DateTimeParseException: Text could not be parsed at index 2 [duplicate]

Answer 1

I didn't get the exception. So Checking your profile I saw that your locale is in Germany so i tried this and got the exception.

    java.time.format.DateTimeFormatter dtf = 
             java.time.format.DateTimeFormatter.ofPattern("EEE, dd MMM yyyy HH:mm:ss zzz", 
                                                       Locale.GERMANY);
    String date = "Mon, 10 Sep 2018 23:57:09 UTC";
    System.out.println(dtf.parse(date));

And the shordays for German are :

Short weekdays So, Mo, Di, Mi, Do, Fr, Sa

Try with this code and I bet it will work

    java.time.format.DateTimeFormatter dtf =
              java.time.format.DateTimeFormatter.ofPattern("EE, dd MMM yyyy HH:mm:ss zzz");
    String date = "Mo, 10 Sep 2018 23:57:09 UTC";
    System.out.println(dtf.parse(date));

But for your String Date to work just use UK or US Locale by passing an argument

    java.time.format.DateTimeFormatter dtf =
           java.time.format.DateTimeFormatter.ofPattern("EEE, dd MMM yyyy HH:mm:ss zzz", 
                                                         Locale.UK);
    String date = "Mon, 10 Sep 2018 23:57:09 UTC";
    System.out.println(dtf.parse(date));