First of all, you can look at the picture below and explain in detail the meaning of each label on the automobile glass.

In the picture above,

"8" stands for the year of 28.

"..."-8 The three black dots on the left indicate that the month is the first half of the year. Subtract the black dots from 7 to get the specific month of April.

if the black spot is on the right side of the year, subtract the number of black spots from 13, which means that the production month is the second half of the year.

therefore, the production date of the glass in the above picture is April 28.