How to Check the Production Date from Car Glass?

[HectorMarie]

Here's how to check the production date of car glass: 1. The number represents the production year of the glass, indicating the last digit of the year. 2. The black dots indicate the production month of the glass. Some glass has dots before the number, while others have dots after the number. 3. If the dots are before the number, subtract the number of dots from 7; if the dots are after the number, subtract the number of dots from 13. The result is the production month of the glass. 4. Some glass may also have a few thick black dots added before the production year and month, which are used to specify the week of the month.