日ひ付づけ変へん更こう線せん

noun

International Date Line

Geographical term for the line where the date changes by one day when crossed.

• 日ひ付づけ変へん更こう線せんを越こえると、日ひ付づけが一いち日にち進すすむ。

  When you cross the International Date Line, the date advances by one day.