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This project step adds the id_expiry DateTime field to the user_ids table. Once the current date and time are past the expiry date and time for an ID card, it stops working.
The project introduces an important AppBlocks concept -- the date and time arithmetic. The DateTime and Time data types of the AppBlocks system are serialized values. As such, they can be calculated upon and compared like regular numbers. In this application, the following block makes the DateTime comparison:
