Add [Printed Timestamp] Field Replacement for Packing Slips

[BobbyT]

We have multiple teams picking orders using Packing Slips. 

It would be beneficial it we were possible to have the date and time that the packing slip was printed printed on the packing slip. This way, it would help Pickers prioritize order based on the age of the order.

Alternate Field Replacement Suggestions that would help solve this problem.

-Age of order
-Date and time packing slip was printed