It will be either 4 or 5, depending on what day of the week the 18th of March is on. There are 4 full weeks and two days, so that means there will definitely be 4 Tuesdays. If the 18th of March is a Sunday, Monday or Tuesday, there will be 5 Tuesdays.
It was a Sunday.
Wednesday
Thursday
Friday
April 4, 1980 fell on a Friday.
Saturday
March 4 2012 is Monday
March 4 1954 was on a Thursday
March 4, 1947 was a Tuesday.
March 4, 1873 was a Tuesday.
March 4 1947 was a Tuesday.
March 4 2008 was a Tuesday.
March 4 1970 was a Wednesday.
March 4 1943 was a Thursday.
March 4 2000 was a Saturday.
March 4, 2019 will be on a Monday.