In Japan, Hina-matsuri used to be observed on March 3 on the old calendar (around present-day April) which was on the seasonal festival (the first day of the Snake month) in March, by the Japanese calendar (lunar-solar calendar), but after the reform of the calendar in January 1, 1873, the festival has been generally celebrated on March 3 by the Gregorian calendar (new calendar).
日本では和暦（太陰太陽暦）の3月の節句（上巳）である3月3日(旧暦)（現在の4月頃）に行われていたが、明治6年（1873年）1月1日の改暦以後は一般的にグレゴリオ暦（新暦）の3月3日に行なう。