Mark on a list until when an opened

Quick answer

While unopened packages follow their printed expiration dates, opened products operate on an entirely different timeline. Your mayonnaise might last six months sealed, but crack that lid and you've got three weeks max.

While unopened packages follow their printed expiration dates, opened products operate on an entirely different timeline. Your mayonnaise might last six months sealed, but crack that lid and you've got three weeks max. Most kitchen disasters start with someone guessing how long that opened jar has been sitting around.

Why keep track of opening dates?

The moment you break that seal, everything changes. Oxygen rushes in, bacteria multiply, and your product starts deteriorating way faster than that original expiration date suggests.

⚠️ Note:

That mayo jar sitting unopened for 6 months? Once opened, it's only safe for 2-3 weeks. Without proper tracking, you're playing food safety roulette.

What should be on your list?

Your opening date tracker needs these five critical pieces of info:

Product name: Be specific - "5L Hellmann's Mayo" not just "mayo"
Opening date: Day you cracked it open
Use by: Your calculated deadline
Location: Walk-in cooler, dry storage, freezer
Who opened it: Accountability matters

? Example list:

Week 8 opened inventory:

Remia Mayonnaise 5L - Opened: 19/02 - Use by: 12/03 - Walk-in - Chef Marco
Tomato puree tin - Opened: 20/02 - Use by: 27/02 - Cold prep - Cook Lisa
Olive oil 5L - Opened: 18/02 - Use by: 18/08 - Dry storage - Sous chef Tim

Standard opening times per product group

Here's your cheat sheet, but always double-check manufacturer specs on the packaging.

Refrigerated items (2-7°C):

Mayo, dressings: 2-3 weeks max
Tomato puree, tapenade: 5-7 days
Milk, cream: 3-5 days
Hard cheese: 2-3 weeks
Deli meats: 2-3 days

Pantry storage:

Cooking oils: 6 months
Vinegar: 12 months
Dried herbs: 6 months
Pasta, rice: 6 months
Flour: 3-6 months

? Example calculation:

Mayo opened February 19th:

Shelf life after opening: 3 weeks
19 February + 21 days = March 12th
List entry: "Use by: 12/03"

Smart ordering tip: don't restock until this jar's nearly gone.

Digital or paper?

Whiteboards and clipboards seem convenient, but they've got serious flaws:

Accidentally erased during cleaning
Nobody verifies accuracy
Ignored during rush periods

Digital tracking through apps gives you searchable records and automatic alerts. Something most kitchen managers discover too late: paper systems fail exactly when you need them most - during health inspections or busy service periods.

Checking and cleanup

Creating the list is just step one. Regular audits keep your system working:

Monday morning: Flag everything expiring this week
Thursday check: Verify weekend products are still good
Sunday cleanup: Toss expired items

⚠️ Note:

Expired means expired, even if it looks fine. Food poisoning bacteria don't announce themselves with funky smells or weird colors.

How do you create an opening date list? (step by step)

Create a format for your list

Set up columns for: product name, opening date, use by, location and who opened it. Use a whiteboard, clipboard or digital app. Post it somewhere everyone can see it.

Train your team to record everything

Explain that every opened package must be on the list. Show them how to calculate the end date: opening date + standard shelf life. Make it part of the daily routine.

Check and clean up weekly

Schedule 15 minutes every Monday to review the list. Mark products expiring this week. Remove products that have expired and take them off the list.

✨ Pro tip

Write opening dates directly on containers with permanent marker - month/day format works best. This gives you instant visual confirmation even when your main tracking list isn't within reach during busy prep.

Calculate this yourself?

In the KitchenNmbrs app you can do this in just a few clicks. 7 days free, no credit card.

Try KitchenNmbrs free →

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Frequently asked questions

Do I need to track all opened products?

Track anything perishable once opened - mayo, purees, dairy, deli meats, opened cans. Skip shelf-stable items like salt, sugar, or dried spices that don't degrade after opening.

What if I can't remember when something was opened?

Toss it immediately or use the shortest possible timeline if you must keep it. Never guess with food safety - uncertainty equals contamination risk in a commercial kitchen.

Who's responsible for maintaining the opening date list?

Everyone who opens a product should log it, but designate one person for weekly audits and cleanup. Split responsibility leads to gaps, and gaps lead to health code violations.

ℹ️ This article was prepared based on official sources and professional expertise. While we strive for current and accurate information, the content may differ from the most recent regulations. Always consult the official authorities for binding standards.

Sources consulted

EU Verordening 852/2004 — Levensmiddelenhygiëne (2004) — Official source
EU Verordening 853/2004 — Hygiënevoorschriften voor levensmiddelen van dierlijke oorsprong (2004) — Official source
EU Verordening 1169/2011 — Voedselinformatie aan consumenten (2011) — Official source
NVWA — Hygiënecode voor de horeca (2024) — Official source
NVWA — Allergenen in voedsel (2024) — Official source
Codex Alimentarius — International Food Standards (2024) — Official source
FSA — Safer food, better business (HACCP) (2024) — Official source
BVL — Lebensmittelhygiene (HACCP) (2024) — Official source
Warenwetbesluit Bereiding en behandeling van levensmiddelen (2024) — Official source
WHO — Foodborne diseases estimates (2024) — Official source

Food Standards Agency (FSA) — https://www.food.gov.uk

The HACCP standards shown in this application are for informational purposes only. KitchenNmbrs does not guarantee that displayed values are current or complete. Always consult the FSA or your local authority for the latest regulations.

Written by

Jeffrey Smit

Founder & CEO of KitchenNmbrs

Jeffrey Smit built KitchenNmbrs from 8 years of hands-on experience as kitchen manager at 1NUL8 Group in Rotterdam. His mission: give every restaurant owner control over food cost.

8 years kitchen manager at 1NUL8 Group Rotterdam

Expertise: food cost management HACCP kitchen management restaurant operations food safety compliance

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