dateless

adjectives

having no known beginning and presumably no end
"the dateless rise and fall of the tides"; "time is endless"; "sempiternal truth"
dateless, endless, sempiternal
of such great duration as to preclude the possibility of being assigned a date
"dateless customs"
dateless
is similar to
not capable of being given a date
undatable
not bearing a date
"a dateless letter"
dateless, undated
unaffected by time
"few characters are so dateless as Hamlet"; "Helen's timeless beauty"
dateless, timeless