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As of 2010, the five most recent occasions that March 31 fell on a Saturday are:
March 31, 2007
March 31, 2001
March 31, 1990
March 31, 1984
March 31, 1979
Yes, march has 31 days.
There are 31 days in March.
March 31 1949 was a Thursday.
March 31 1978 was a Friday.