How to Determine a Vehicle's Production Date from the Glass?

[DominicDella]

Automotive glass production dates are primarily displayed in two ways: one is a combination of black dots and numbers or numbers and black dots, and the other is numbers plus small black dots and asterisk black dots. Below is an introduction to the content of automotive glass production dates: 1. The first method, black dots plus numbers or numbers plus black dots, if there are small black dots in front followed by a number, it indicates the production month in the first half of the year, calculated as 7 minus the number of small black dots. If there is a number in front followed by small black dots, it indicates the production month in the second half of the year, calculated as 13 minus the number of small black dots. 2. The second method, numbers plus small black dots and asterisk black dots, usually consists of a number followed by several small black dots and then asterisk black dots. The interpretation is as follows: the number represents the last digit of the year, the small black dots in the middle represent the quarter (for example, two dots indicate the second quarter), and the asterisks represent the month within the quarter (for example, four asterisks indicate the fourth month).

[Madelyn]

I often check the production date of car glass, and it's quite simple. There are small dots or numeric codes in the corners of the glass, usually found at the lower right corner of the windshield or the bottom of the side windows. The format is typically dots plus numbers, like •18•. The dots may represent the last digit of the year, for example, • could indicate the 2010s, and 18 would be the 18th week. This helps me determine the age of the car and avoid buying a refurbished one. If I find a date earlier than the vehicle's production date, the glass might have been replaced, suggesting a history of accidents. Different brands have variations—American cars often use dots, while Japanese cars may directly mark the year and month with numbers, so I need to check the manual for reference. Remember to clean the glass with a cloth and use a flashlight for better visibility. After checking, I usually note down the date for future maintenance reference.

[Julio]

As a young car enthusiast who loves tinkering with vehicles, I learned how to check the production date from the glass by researching methods online. Those small markings in the corners of the glass, like the •19• pattern in the lower right corner of the windshield, indicate the production details—the dots represent the year (19 could mean 2019), and the number 19 stands for the 19th week. I used this trick when buying my last car: I wiped the glass clean, turned on my phone's flashlight, and easily decoded that the glass was produced a year earlier than the car's manufacturing date, which made me suspect water damage, so I walked away. During regular maintenance, I also glance at these markings to ensure the glass is original and hasn't been replaced. Slight variations in dates between different glass panels, like the door glass and windshield differing by a few weeks, are normal. The key tools are simple: just a tissue and a light source.

[VonBella]

Checking the production date of car glass is not difficult. Look for the code in the corner of the windshield, such as •20•, where the number 20 refers to 2020, and the dots may indicate the production cycle. After cleaning, use a flashlight or natural light to clearly see the format. If the number is on the left, it indicates the year, and dots on the right represent the week number. When inspecting, compare the dates on all windows; significant discrepancies may indicate replacement. This information helps buyers assess the vehicle's condition and is practical and straightforward.

[HannahRose]

When deciphering the production date from the corners of glass, I pay attention to variations in different locations. For example, windshields are often marked in the lower right corner, with codes like •21• indicating the week of production in 2021. Side windows may have similar markings, but the dates could be slightly later due to the assembly sequence. After cleaning the glass, use a flashlight for clear visibility to avoid misreading. This date helps me determine if the car has undergone accident repairs; the original factory date should align closely with the vehicle's overall production month. Different car models share similar code formats, with dot-number combinations being common. In practice, carrying a magnifying glass makes the task easier.

[VonMargaret]

When inspecting a used car, I always check the glass production date. Codes like •22• in the corner of the glass may indicate the last digit of the year, with 22 representing the 22nd week. Clean the area with a cloth and view it directly or with the aid of a light. If the date is several months earlier than the car's production date, it might indicate the glass was replaced, suggesting a collision; dates close to the car's production date are normal. In practice, comparing dates across multiple glass locations is more accurate—the windshield and door glass dates should match. This method has helped me avoid pitfalls and is simple yet effective.