New Year’s Day ( 1st Jan ) is called Ganjitsu or Gantan in Japanese. It is the day to celebrate the coming of the New Year. Most Japanese regard New Year’sY Day as the most important national holiday. As the old proverb says, ”it is the day to make new plans. for the year” and start afresh with a new state. of mind. In Japan, most people are able to get off school or work during the first three to seven days of January. So we can enjoy doing lots of time-honored customs for this season in a relaxed manner.