dateless vs timeless

dateless and timeless both are adjectives.

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

As adjectives, dateless and timeless are synonyms defined as:

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