Yes, there is one day between those two dates.
April 11th of 1990 was a Wednesday.
11th, April, 2000, was a Tuesday.
April 11th, 1970 fell on a Saturday.
April 11th, 2009 fell on a Saturday.
April 11th, 1945 fell on a Wednesday.
9th of April 1959 was a Thursday.
It was a Friday.
it was a Tuesday
April 11th, 1985 was a Thursday.
April 9th
11th April
Saturday