So in the character page for Sterling Archer his birthday is listed as December 30th 1978 but no source/evidence is cited/can be found for this claim ?

I've seen others argue he was born in 1948 and this claim uses the 1954 Guatemalan coup d'état as evidence to support the claim... I'm just wondering if anyone has anything to back up the December 30th 1978 claim as it's pretty specific and I cant seem to find anything on the matter...