Wordnet 3.0
ADJECTIVE (1)
1. 
 that can be given a date; 
- Example: "a concrete and datable happening"- C.W.Shumaker[syn: datable, dateable]
The Collaborative International Dictionary of English v.0.48:
dateable \dateable\ adj.
   that can be given a date. Opposite of undatable. [Narrower
   terms: dated]
   Syn: datable.
        [WordNet 1.5]
              a concrete and dateable happening   --C. W.
                                                  Shumaker
WordNet (r) 3.0 (2006):
dateable
    adj 1: that can be given a date; "a concrete and datable
           happening"- C.W.Shumaker [syn: datable, dateable]
           [ant: undatable]