dateless vs endless

dateless and endless both are adjectives.

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

As adjectives, dateless and endless are synonyms defined as:

Other synonyms of dateless include sempiternal.

dateless (adjective)	endless (adjective)
having no known beginning and presumably no end	having the ends united so as to form a continuous whole
unaffected by time	having no known beginning and presumably no end
not bearing a date	tiresomely long; seemingly without end
of such great duration as to preclude the possibility of being assigned a date	infinitely great in number