The fixture will kick off at 7:45pm at Orient's Matchroom Stadium.
The match is now sandwiched between a trip to Coventry City the Saturday before (14 February 2015) and a home fixture with Walsall the Saturday after (21 February 2015).
City's trip to Orient was originally scheduled for Saturday 3 January 2015 but it had to be moved following the Bantams' progression into the F.A Cup third round.