code: public Date dateTime(ImapRequestLineReader request) throws ProtocolException {
          char next = request.nextWordChar();
          String dateString;
          // From https://tools.ietf.org/html/rfc3501 :
          // date-time       = DQUOTE date-day-fixed "-" date-month "-" date-year
          //                   SP time SP zone DQUOTE
          // zone            = ("+" / "-") 4DIGIT
          if (next == '"') {
              dateString = consumeQuoted(request);
          } else {
              throw new ProtocolException("DateTime values must be quoted.");
          }
  
          try {
              // You can use Z or zzzz
              return new SimpleDateFormat("dd-MMM-yyyy hh:mm:ss Z", Locale.US).parse(dateString);
          } catch (ParseException e) {
              throw new ProtocolException("Invalid date format <" + dateString + ">, should comply to dd-MMM-yyyy hh:mm:ss Z");
          }
      }
docs: Reads a "date-time" argument from the request.