The Collaborative International Dictionary of English v.0.48:

Beforetime \Be*fore"time`\, adv.
   Formerly; aforetime.
   [1913 Webster]

         [They] dwelt in their tents, as beforetime. --2 Kings
                                                  xiii. 5.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

38 Moby Thesaurus words for "beforetime":
   aforetime, ahead, ahead of time, anticipative, anticipatory,
   before, before now, beforehand, betimes, bright and early, earlier,
   early, erenow, erewhile, erst, forehand, forehanded, foresighted,
   foresightedly, formerly, heretofore, historically, hitherto,
   in advance, in anticipation, in good time, in the past,
   in times past, only yesterday, precociously, prehistorically,
   prevenient, previously, priorly, recently, then, whilom,
   yesterday