dateless

adjective

1. 1

   unaffected by time

   few characters are so dateless as Hamlet

   Helen's timeless beauty

2. 2

   not bearing a date

   a dateless letter

3. 3

   of such great duration as to preclude the possibility of being assigned a date

   dateless customs

4. 4

   having no known beginning and presumably no end

   the dateless rise and fall of the tides

   time is endless