31st March 1957 was a Sunday.
July 31st, 1957 fell on a Wednesday.
31st March 1851, was a Monday.
March 31st, 1956 fell on a Saturday.
The day of the week was Thursday, if that is what you are asking.
Saturday
A Thursday.
Monday
March 1st was a Monday, March 31st was a Wednesday.
March 31st 1946 was a Sunday.
March 31, 1966 was a Thursday.
31st March 1966 was a Thursday.
It was a Tuesday.