Yesterdays Date

I am currently displaying variables on a PV550 for daily data logging. However one concern is an operator using data from the previous day for the current. I only want to specify a date for the data one day back. For example: If we made 10 gadgets yesterday, I want to display 10 gadgets with yesterdays date Jan 8th tagged to it. Is there a trick for displaying a previous days date? Will logic need to be written and if so any ideas?

Thank You

The way i do it is to write code on the plc and save your yesterday´s production.

Take a look at this thread, OKiePC has a few screen shots on using the FFL and FFU instructions.

I'm currently using that to track the date and time of an event. Might something to take a look at.