However, because the gap in dates between the lunar-solar calendar such as the Kansei calendar which was in use at those time in Japan and the Western Gregorian calendar differed every year, for convenience sake, it became an annual event to have a party for Oranda Shogatsu on the 11th day after the winter solstice (which fell on the same day on both calendars) since the following year.
ただし、当時使用されていた寛政暦などの太陰太陽暦と西洋のグレゴリオ暦とのずれは毎年異なっていたため、便宜上、翌年以降は冬至（太陽暦でも太陰太陽暦でも同じ日である）から数えて第11日目にオランダ正月の賀宴を開催するのが恒例となった。