When did you Celebrate St. Patricks Day this year?

So Monday, I was happily minding my own business, wearing green and wishing other American students of Russian a Happy St Patrick's Day. I came home, opened my e-mail and saw that my husband had opened and read the e-card I had sent to him in advance - Being N. Irish - Though not Catholic - he still appreciates St. Patrick - though the American passion for the holiday and the rules about wearing green baffle him.
Did you like the card? I asked him.
Sure, he said, but its not St. Patrick's Day
Of course it is, I said, It's the 17th.
Its holy week
So?
St Patrick's day can't be during holy week.
What are you talking about? St. Patrick's Day is the 17th and today is the 17th.

It's times like this when the internet comes to the rescue - a quick Google and -poof- St. Patrick's day was the 15th!!! Apparently the Catholic church changes the day of the holiday when ever it interferes with Holy Week.

A survey of Americans in Kiev revealed that we had all missed the memo. Even the Christian School observed St Patrick's Day on the 17th and encouraged students to wear green.

So when did you celebrate?