Does the shelf life count as the day? What is the standard for calculating the shelf life?

Often, people accidentally leave the things they bought for a long time without using or eating them. At this time, everyone will follow the principle of not wasting and check the shelf life. If it is not expired, they will continue to use or eat it. Then, there is often an embarrassing situation that the day when the shelf life expires is the day when you find it. At this time, everyone will hesitate whether it is expired or not, and can it still be used? The following editor will talk to you about the question of whether the shelf life is counted as the day.

Does the expiration date count as today?

(1) The so-called shelf life is a relatively appropriate value obtained by the manufacturer after a certain range of data is obtained through certain tests. It is generally impossible to be accurate to the day.