If you mean seed packages, its because seeds are less likely to germinate after the expiration date. Some seeds can remain viable for centuries if they are kept in a cool, dry place, and other seeds are only viable for a shorter period of time.
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The expiration or best-use-by dates are for unopened packages.
The packages normally have manufacturing dates on them. These dates may be coded -- you can call the company and they will tell you have to interpret the code. Unopened packages of tobacco & cigarettes are good for six to twelve months. They will last longer if kept in the refrigerator (not the freezer). Opened packages dry out fairly quickly -- maybe a week.
Eastbay coupons vary if they have expiration dates. Some coupons have expiration dates placed on them. If the expiration date is absent then they do not expire.
A can of oysters do expire. Expiration dates or best used by dates are marked on packages to ensure freshness before those dates.
Cashier's checks do not typically have expiration dates.
Without seeing the coupons it is hard to say. Most coupons do have expiration dates. If yours does it should be printed on the coupon, or say no expiration.
There are expiration dates with online certficates. Check the store you are purchasing from.
Soda companies started putting expiration dates on soda cans in 1983 Soda companies started putting expiration dates on soda cans in 1983
No
They have expiration dates on it.
Yes
The Doctors - 2008 Ask Our Doctors Expiration Dates Exposed was released on: USA: 29 September 2009