There shall be no correction of Date of Birth on Certificate of National Service (CNS) after completion of National Service.
Accordingly, you are strongly advised to utilize the link provided on your dashboard for Date of Birth correction during your Online Registration.
Also, note that NYSC will not entertain any request for Date of Birth correction once you have been deployed and commenced your Service Year. Online Registration is ongoing. https://twitter.com/officialnyscng/status/1275309289054310400?s=19