Antonyms of adj undated

1 sense of undated

Sense 1
dateless, undated -- (not bearing a date; "a dateless letter")

INDIRECT (VIA undatable) -> datable, dateable -- (that can be given a date; "a concrete and datable happening"- C.W.Shumaker)

Similarity of adj undated

1 sense of undated

Sense 1
dateless, undated -- (not bearing a date; "a dateless letter")
       => undatable (vs. datable) -- (not capable of being given a date)