Closing Jobs w/ Std costs Month-end procedures

How do you handle closing of jobs that ship at month-end? Do you post-date the closing so the MNF-VAR transactions post in the same month as the rest of the job? We have been closing the following day but it has created a negative WIP account because Standard comes out of WIP at shipment but the offsetting variance doesn't post until the job was closed in the following month. Pros? Cons?