Hi, I would like to change the label by time.
In detail, items are generated by source with labels(duniform 1 to 4).
When the item was transported into the rack, it begins to count the time how long the items stay in the rack.
Every 24 hours past, the label of the item will plus 1 ,until it reach 4 (the maximum).
Please help me to solve it. Thanks a lot!