I'm currently working on a Access database which will store data about different packaging lines. The thing is that there are 3 shifts in a working day and each one has a different time period (510 minutes, 480 minutes, etc). The client also wants the flexibility to change the duration of the shifts without changing the historical data... This is my problem. I don't know how to give them that tool without changing the old data. I'd tried VB code, but still doesn't work. PLease!! I need help!!!