Certain items in your house practically scream “toss me” when their prime has passed. That mysterious extra white layer on the Cheddar? A sure sign it needs to be put out of its misery. Chunky milk? Down the drain it goes.

But what about that jar of olives or Maraschino cherries that has resided in your refrigerator since before the birth of your kindergartner? Or the innumerable nonedibles lurking deep within your cabinets and closets: stockpiled shampoo and toothpaste, seldom-used silver polish? How do you know when their primes have passed?

With help from experts and product manufacturers, Real Simple has compiled a guide to expiration dates. These dates are offered as a rough guideline. The shelf lives of most products depend upon how you treat them. Edibles, unless otherwise indicated, should be stored in a cool, dry place. (With any food, of course, use common sense.) Household cleaners also do best in a dry place with a stable temperature. After the dates shown, beauty and cleaning products are probably still safe but may be less effective.

Food

Beer
Unopened: 4 months.

Brown sugar
Indefinite shelf life, stored in a moistureproof container in a cool, dry place.

Chocolate (Hershey bar)
1 year from production date

Coffee, canned ground
Unopened: 2 years
Opened: 1 month refrigerated

Coffee, gourmet
Beans: 3 weeks in paper bag, longer in vacuum-seal bag (after this time, color or flavor may be affected, but product is still generally safe to consume)
Ground: 1 week in sealed container

Coffee, instant
Unopened: Up to 2 years
Opened: Up to 1 month

Diet soda (and soft drinks in plastic bottles)
Unopened: 3 months from “best by” date.
Opened: Doesn’t spoil, but taste is affected.

Dried pasta
12 months

Frozen dinners
Unopened: 12 to 18 months

Frozen vegetables
Unopened: 18 to 24 months
Opened: 1 month

Honey
Indefinite shelf life

Juice, bottled (apple or cranberry)
Unopened: 8 months from production date
Opened: 7 to 10 days

Ketchup
Unopened: 1 year (after this time, color or flavor may be affected, but product is still generally safe to consume)
Opened or used: 4 to 6 months (after this time, color or flavor may be affected, but product is still generally safe to consume)

Maple syrup, real or imitation
1 year

Maraschino cherries
Unopened: 3 to 4 years
Opened: 2 weeks at room temperature; 6 months refrigerated

Marshmallows
Unopened: 40 weeks
Opened: 3 months

Mayonnaise
Unopened: Indefinitely
Opened: 2 to 3 months from “purchase by” date (after this time, color or flavor may be affected, but product is still generally safe to consume)

Mustard
2 years (after this time, color or flavor may be affected, but product is still generally safe to consume)