Dateless

[deitlis]

(adj.) unaffected by time; 'few characters are so dateless as Hamlet'; 'Helen's timeless beauty' .

(adj.) not bearing a date; 'a dateless letter' .

(adj.) of such great duration as to preclude the possibility of being assigned a date; 'dateless customs' .

(adj.) having no known beginning and presumably no end; 'the dateless rise and fall of the tides'; 'time is endless'; 'sempiternal truth' .

Checker: Marie--From WordNet

(a.) Without date; having no fixed time.

Checked by Evan