May 23 2010 was a Sunday.
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May 23 1967 was on a Tuesday.
It was a Monday.
Saturday
The 143rd day in 2010 is the 23 May. 31 days in January 28 days in February 31 days in March 30 days in April 120 leaving 23 days needed in May.
September 23 2006 was a Saturday.