Today is a national holiday, Kenkoku Kinen no Hi or National Foundation Day. This day was originally called Kigensetsu or Emperor Day came from Nihonshoki. The ancient report said that the first Emperor Jinmu established Japan on this day.
Japan is one of the oldest countries in the world. Japanese ancient calendar says it's 2676th year now. Of course that is unreliable theory, but still Japan has its long long history. I'm really proud of that.