Highly popular mods like "Polish Plus" or "Kaiserreich" (Polish translation) often have specific edit timestamps in their changelogs on the Steam Workshop.

Given the specific timestamp (), this most likely refers to a version history or "Data edycji" (Edit Date) for one of the following: Common Sources for this Timestamp

This DLC was released in late September 2022, and many Polish guides or wiki pages were being heavily edited and finalized in early November to reflect the new Italian focus trees and aircraft designer mechanics [1, 2].

If you are looking for the actual game content associated with that period, it centered on: