New Japanese year "Gengo" is "Reiwa". How to read "令和" is "reiwa". 　
The app is the list of Japanese year and Western year. Japan has the eras such as Meiji, Taisho, Showa, Heisei and Reiwa.

Easy to use and understand between Japanese year and Western year.
Tapping the star button in the upper right, add to the favorites. After that, you can check the favorite list.
Meiji 1 - 45
Taisho 1 - 15
Showa 1 - 64
Heisei 1 - 31
Reiwa 1 -

Look at the icon, you can find Japanese year in this year. The upper left is "R5". "R" means "Reiwa", so R5 is Reiwa 5.
The lower right is 2023. It means that "2023" equal "Reiwa.5".