It seems the code for verifying SOA serials hasnt been updated to reflect the year 2014.
check this domain: sebbe.eu
| SOA field check | One or more SOA fields are outside recommended ranges. Values that are out of specifications could cause delays in record updates or unnecessary network traffic. The SOA fields out of range are: serial | 2014050304 | SERIAL - we check that your serial number matches the recommended format found in RFC1912 section 2.2. |
The serial 2014050304 is in the recommended format:
Data last updated 2014-05-03 (3rd May of 2014) and this is fourth revision.
So why are it warning for this?