What? Two different Mother’s days?

Here in Japan, and in many other countries around the world, today is Mother’s Day. 今日はたくさんの国では母の日が祝われています。Although I am spending the day alone, working in my office, my 16-year-old son has promised to make me pizza for dinner. 私は事務所で今週のレッスンを準備して、母の日を一人で過ごしていますが、今夜１６歳の息子が自慢のピザを作ってくれるそうです。How are you all spending the day? 皆さんはどう過ごしていますか？
As you may know, although I have been in Japan for over half of my life, I am originally from the UK. ご存じだと思いますが、人生の半分以上を日本で過ごした私は英国出身です。Did you know that in the UK, Mother’s Day is actually held on a different day every year. 知っていましたか？イギリスでは母の日は年によって日付が変わります。This year it was March 6th. 今年はもすでに３月６日に祝われました。This is because, like Easter, it is a moveable feast. Every year, Mother’s Day (or Mothering Sunday) is held on the 4th Sunday of Lent, exactly 3 weeks before Easter.イースターと同じく母の日は移動祝日です。毎年、母の日はレント「大斎（四旬節)」の第４日曜日、イースターの3週間前に祝われます。 For those who like to be well-prepared, next year it will fall on the 26th of March.ちなみに来年３月２６日にあるそうです。 Being away from the UK, I have a tendency to forget, so maybe I should make a note of it right now!忘れないうちに書いておこう！