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Thirty years on from February 12, 2011 will be February 12, 2041. That day will be a Tuesday.
Fat Tuesday in 2009 was on February 24th, the last day of Mardi Gras.
February 17, 2009 was on a Tuesday.
24th February
If today is Sunday, March 22 2009, Tuesday will be March 24th and the following Tuesday will be the 31st.