dateless vs sempiternal

dateless and sempiternal both are adjectives.

Word	Noun	Adjective	Verb	Adverb
dateless	No	Yes	No	No
sempiternal	No	Yes	No	No

As adjectives, dateless and sempiternal are synonyms defined as:

dateless and sempiternal: having no known beginning and presumably no end

Other synonyms of dateless include endless.

dateless (adjective)	sempiternal (adjective)
having no known beginning and presumably no end	having no known beginning and presumably no end
unaffected by time
not bearing a date
of such great duration as to preclude the possibility of being assigned a date