Expiration Date Calculator › Best Before Date

Best Before Date Calculator

Work out a best before date for food from the day it was made or opened plus its shelf life. Best before is about quality, not safety.

Best before date from shelf life
Best before
Best before dateJuly 17, 2026
Days remaining7 days left
Day of the weekFriday
Quick answer
A best before date is the made or opened date plus how long the food keeps at its best. Enter both and the tool adds them on the calendar. Remember that best before is about quality, not safety: many foods are still fine to eat a little past it, though they may lose flavour or texture. A "use by" date is the safety limit and should not be passed.

How it works

best before = made date + how long it keepsquality date, not a safety limit
made or opened
the starting date for the food
keeps for
the quality shelf life
best before
the date quality starts to drop

Once opened, many foods keep for a shorter time than the unopened pack, so use the period-after-opening on the label rather than the original date.

Frequently asked questions

Is best before the same as use by?

No. Best before is about quality; food is usually safe after it but may not taste its best. Use by is about safety and should not be passed.

Can I eat food after the best before date?

Often, yes, if it has been stored properly and looks and smells fine. Use your judgement, and never ignore a use-by date.

Does opening food change the date?

Usually. Once opened, use the shorter period-after-opening printed on the pack.

How is the date worked out?

It adds the shelf life to the made or opened date on the calendar.

Quick facts
Best before
quality
Use by
safety
Once opened
shorter
Date
made + shelf life