Japan uses the Western calendar pretty much as-is. One addition is the Japanese gengou system of year/era counting, which resets with a new era name every time a new emperor is enthroned (at least in recent years). Most people are aware of and use both the Western and Japanese methods of year counting, though.

The last reset was in May 1st 2019, when Heisei year 31 switched to Reiwa year 1. (Yes, a single year can have two era-based names since the switch doesn't necessarily occur on New Year's Day. Annoying.) It is now Reiwa 4.