I can’t understand the best-before date.

The year, month, and date are displayed, reading from the left side. If the month and date are only one digit, a zero is placed in front of them. For example, “2021.04.18/” indicates a best-before date of April 18, 2021. The best-before date is written on cap of the plastic bottles and on the backside bottom of the container for the jelly.