Fun fact: Taiwan (ROC) also has an unusual year counting scheme, where they count from the founding of the Republic of China.
I once bought a Japanese product in Taiwan which had an expiration date using Japanese years, included a ROC year translation of said date and the receipt was printed with the gregorian year. Three different counting schemes in just one transaction, quite amusing.
The Democratic People's Republic of Korea (aka North Korea) uses what is basically the same scheme, and calls it the Juche calendar. That it counts from the same year is coincidental.
I once bought a Japanese product in Taiwan which had an expiration date using Japanese years, included a ROC year translation of said date and the receipt was printed with the gregorian year. Three different counting schemes in just one transaction, quite amusing.