What I have is a report that we update daily. New lines are inserted in the existing worksheet daily. Column H is the desired due date and column J is expected completion date (which is manually updated by project managers). What I would like to do is have a macro that will copy column H and paste to Column J (making the completion date equal to desired due date, but not overwrite cells in Column J that already have expected completion date.

sample
H J
1/01/16 1/15/16
1/01/16
1/01/16 1/16/16
1/01/16 1/08/16
1/01/16

desired output
H J
1/01/16 1/15/16
1/01/16 1/01/16
1/01/16 1/16/16
1/01/16 1/08/16
1/01/16 1/01/16