What is the reason for two rows of dots appearing on the Lavida's glass date?

[VanJulia]

Generally, the production date on the vehicle's glass is indicated by a number followed by black dots. The dots in front of the number are subtracted from 7, and those behind are subtracted from 13, which corresponds to the production date. Below is relevant information: 1. Body dimensions: The length, width, and height are 4605mm, 1765mm, and 1460mm respectively, with a wheelbase of 2610mm. 2. Color scheme: The Lavida inherits the traditional 'dark top and light bottom' color combination of Volkswagen models in China. However, referencing the design style of Japanese mid-size cars, a wooden trim that integrates with the center console is added between the two.