Date Marking and Shelf Life

Cold holding slows bacterial growth. It does not stop it. Listeria monocytogenes in particular grows at refrigeration temperatures, which is the whole reason a container of chicken salad has an expiry date at all. Date marking is the control that puts a hard stop on how long a cold, ready-to-eat food may sit before it becomes a hazard nobody can see or smell.

The date marking rule

Ready-to-eat TCS food that will be held longer than 24 hours must be labeled with a use-by date no more than seven days from the date of preparation or opening, when the food is held at 41F (5C) or lower. The day of preparation or opening counts as day one.

Three parts of that sentence carry weight:

• Ready-to-eat and TCS. Both conditions must hold. Chicken salad, sliced deli meat, cooked pasta, cut leafy greens, and opened cartons of milk are all in. A bag of dried rice is not TCS. A raw chicken breast is TCS but not ready to eat.
• Held longer than 24 hours. Food prepared and served the same day does not require a date mark.
• Day one is the day of preparation or opening, not the day after. Prepare chicken salad on Monday and the use-by date is Sunday.

On the seventh day, the food is discarded. Not tasted, not smelled, not cooked. The pathogens this rule controls do not announce themselves.

Note what happens when the food is held above 41F. The seven-day allowance depends on 41F (5C) or lower. Food held warmer has a shorter permitted life, and food that has been through time-temperature abuse is governed by the four-hour cumulative danger zone rule instead, which overrides any date on the label.

Counting the days

The counting trips people up because day one is the day of preparation. Work it as a calendar rather than as arithmetic.

Open a commercial container of sliced deli turkey on Thursday and put it in a cooler at 39F. Thursday is day one. The use-by date is the following Wednesday.

Freezing pauses the clock

Freeze food after preparation and the seven-day clock stops. When the food is thawed, the remaining days resume.

Prepare marinara on Monday, which is day one. Freeze it on Wednesday, which is day three. Three days have been used, so four remain. Thaw it the following week and it must be used within four more days at 41F or lower. Total time at 41F (5C) or below can never exceed seven days, no matter how the freezing is arranged.

Freezing is not a reset and it is not a kill step. Bacteria go dormant and resume when the food thaws.

Combining ingredients with different dates

When ingredients with different preparation dates are combined, the whole batch takes the date of the oldest ingredient. Mix chicken salad prepared on Monday into a batch prepared on Wednesday, and the combined product carries Monday's date, which means Sunday's use-by. The mixing does not average anything and it does not buy time.

Date marking and FIFO

FIFO stands for first in, first out. Stock is rotated so the product closest to its use-by date is used first: new deliveries go behind, older product comes forward, and anything past its date is pulled.

FIFO and date marking are two halves of one system. Date marking tells you which item is oldest. FIFO makes sure that item is the one that gets used. Run date marking without FIFO and you get accurate labels on food nobody reaches until it expires.

What has to be on the label

Beyond the date, storage labeling requirements are worth knowing as a set:

• Ready-to-eat TCS food prepared in house: the use-by date, and typically the item name and prep date
• Food removed from its original container: the common name of the food
• Chemicals in working containers: the common name of the chemical
• Food for off-site service: the item and the use-by date

One 9th Edition point sits alongside this: single-use containers must not be reused to store food. They are designed to be used once, they cannot be effectively cleaned and sanitized, and a container that was never intended for repeat use is not a storage container regardless of what it once held.

Food Handler versus Manager: how deep to go

Food Handler candidates need the seven-day rule, that day one is the day of preparation or opening, the 41F condition, that expired food is discarded, what has to go on a label, and how FIFO works. Straight recall and short scenarios. The Food Handler exam is 40 questions and passes at 75%, or 30 correct.

Manager candidates need all of that plus the manufacturer date interaction, the frozen pause, the oldest-ingredient rule for combined foods, the relationship between date marking and the four-hour danger zone rule, the single-use container prohibition, and how date marking is monitored and verified inside a food safety management system. Manager questions are usually a date calculation or a scenario where a label and a temperature history conflict.

Practice set

1. Ready-to-eat TCS food held at 41F must be discarded after how many days? A. 3 B. 5 C. 7 D. 14

2. A cook prepares tuna salad on Tuesday. What is the use-by date? A. The following Tuesday B. The following Monday C. Wednesday of the same week D. The following Wednesday

3. Which food must be date marked? A. A bag of dry pasta B. A container of house-made chicken salad held for four days C. Raw chicken to be cooked tomorrow D. Unopened canned tomatoes

4. A container of ready-to-eat TCS food is prepared and served the same day. Is date marking required? A. Yes, always B. No, food held 24 hours or less does not require it C. Yes, but only the time D. Only if it is sold to go

5. Chicken salad prepared Monday is frozen on Wednesday and thawed the following Monday. How many days remain? A. None, the clock ran out B. 4 C. 7 D. 2

6. Two batches of coleslaw, one made Monday and one made Thursday, are combined. What date does the combined batch carry? A. Thursday's B. Monday's C. The date of combining D. An average of the two

7. What does FIFO mean? A. First in, first out B. Fresh items first, older out C. Frozen in, frozen out D. Food inspected, food ordered

8. A commercially prepared item has a manufacturer's use-by date that falls before the seven-day mark. Which applies? A. The seven-day rule always B. The manufacturer's date C. Whichever is later D. Neither, once opened the date resets

9. A cook finds a container of pasta salad dated eight days ago. It smells fine. What should happen? A. Serve it, it smells fine B. Reheat it to 165F and serve C. Discard it D. Freeze it for later use

10. Which container may not be reused to store food? A. A washed and sanitized food-grade storage bin B. A single-use container C. A stainless hotel pan D. A labeled squeeze bottle designed for reuse

Answers

1. C. Seven days at 41F (5C) or below, counting the day of preparation. A and B are stricter than the requirement. D exceeds it and would allow Listeria to reach dangerous levels under refrigeration.

2. B. Tuesday is day one, so the seventh day is the following Monday. A counts eight days. C is far short. D counts nine.

3. B. House-made ready-to-eat TCS food held more than 24 hours. A and D are shelf-stable and not TCS in that state. C is TCS but not ready to eat.

4. B. Food held 24 hours or less does not require date marking. A overstates it. C invents a requirement. D is not the deciding condition.

5. B. Days one through three were used before freezing, leaving four. A ignores that freezing pauses the clock. C treats freezing as a reset. D miscounts.

6. B. The combined batch takes the oldest ingredient's date, Monday. A and C both extend the life of the older food. D is not a rule that exists.

7. A. First in, first out. B, C, and D are invented expansions.

8. B. The manufacturer's date governs when it is earlier. A ignores it. C takes the more permissive option, which is backwards. D is false.

9. C. Discard it. Eight days exceeds the limit. A relies on smell, which does not detect the pathogens this rule controls. B does not destroy heat-stable toxins and does not restore an expired product. D cannot pause a clock that has already run out.

10. B. Single-use containers must not be reused to store food, since they cannot be effectively cleaned and sanitized. A, C, and D are all designed for repeated cleaning and reuse.

This hub is study material for candidates preparing for ServSafe certification exams. It is not affiliated with, endorsed by, or connected to the National Restaurant Association Educational Foundation, and it does not certify anyone. Certification is issued only by the exam provider.