Yep, that looks like a typo.

Hey Mitchy, how are you? I hope you are doing just fine! I should think that the word ''daye(s)'' is not a typographical error or a typo of some kind, but rather is a pseudo-archaic spelling of the word ''date(s)''. The same thing applies to other English words, such as: 1) ''fayre'' = a pseudo-archaic spelling of ''fair'' or even ''fare''; 2) ''weare'' = a pseudo-archaic spelling of ''were''; 3) ''doe'' = a pseudo-archaic spelling of ''do''; 4) ''soe'' = a pseudo-archaic spelling of ''so''; 5) ''yeare'' = a pseudo-archaic spelling of ''year''; 7) ''houre'' = a pseudo-archaic spelling of ''hour''; and etc... In that regard, the phrase you mentioned on your question could be rewritten in our modern/informal English as: ''The dates under it are the year I was born.'' Here are some other examples taken from Classic Literature: ''And soe every streete had a pagiant playinge before them at one time, till all the pagiantes for the daye appoynted weare played.'' (The Free Dictionary (site) - Chapter XXXII: About The Beginning Of The Theater) ''Helpe quickly her to dight, But first come ye fayre houres which were begot In loues sweet paradice, of Day and Night, Which doe the seasons of the yeare allot...'' (a verse extracted from "Poem 6" by Edmund Spenser) IMPORTANT: I am not an expert in English grammar, but as far as I know most of these words are only seen in literary contexts. Hope you have understood this explanation! Should you have any further questions, do not hesitate to contact me. I shall be pleased to help.

Thank you !

'Dayes' is not an archaic spelling: it's a mistake, a simple slip of a finger on the keyboard, when someone typed 'y' instead of its neighbour 't'.

That looks like a typographical error. It probably means "dates."