St Patrick's Day is always March 17th, the same way Christmas is always December 25th. Whatever day of the week they may happen to fall on. It means each year is a little different from the last year.

However in an imperfect world people sometimes cheat by having St Patrick's Day celebrations on some adjoining weekend day. A deplorable habit.

Of course the trouble is that outside Ireland it isn't a public holiday - I feel that part of celebrating it should involve taking the day off, if it's a workday. First things first.