Today isn't a holiday in Japan like it is in China or Korea, but Japan does follow the Chinese zodiac, where there are twelve years each representing animals.
If on your birthday this year you're turning a multiple of 12 (12, 24, 36, etc.) then you are a Dragon!
In Japanese, that's ryu. The Kanji symbol, derived from Chinese writing, can be seen in the picture right over there.
So get to it, Dragons. Tradition dictates that this should be a very good year for you!