"When is Easter this year?"

Pose this question to a Japanese person and I doubt if many could provide the correct answer. A majority are likely to reply, "Sorry, I don't know." Some might even ask "What's Easter?"

OK, to be honest, I didn't know when it is either. A Google search informed me that this year it falls on Sunday, April 16, which is the first Sunday after the first full moon occurring on, or after, the spring equinox (around March 21). In other years, Easter falls no earlier than March 20 and no later than April 25.