If you need to postdate a shipment to be sent at a later date you can change it by clicking on “Ship Date” on the Ship screen and selecting a new date. This can be done for up to 30 days in the future for USPS and the majority of carriers. For FedEx, the limit is 7 days in the future.
If processing in the Batch screen, on the right-hand side check off the box to edit the Shipment Date. Select the date you will ship and select "Save changes".
It will display the ship date above the shipping service selected within the batch screen if it is postdated.