In the environment at the time, no, I wouldn't date the product.
I was the only one using it, I knew that this week I made the crab cakes on Tuesday, the dungeness was live backed and cooked on Friday, etc.
The only need for dating would be for someone else to know the history.
As I was never allowed to be sick (even worked through a bad case of shingles), that was never going to happen.
Where I'm at now?
I label and date everything, legibly.
Other people need to...