In today's world of technology, and those who will abuse it to take advantage of others, is there any amount of security that can guarantee you won't be scammed?
On second thought;
Do you think they decide on an expiration date for an item , based on its typical spoilage,
or based on how frequently they want you to discard it and
to purchase replacement product, more of the same?
Do you think it would be possible for all parts of the planet to have the same time?
On the subject of food, I would guess that the manufacturers test the food to see how long it stays fresh.
Is it possible to all change from midnight to 12:01 AM simultaneously? Of course. Anything not constrained by physical laws is possible. The issue is whether it would be more unwieldy than our current system.
Wouldn't it be more complicated to try to memorize who has daylight hours starting at midnight, or 7 AM, or 9 PM, than look up their time zone?