It was a Sunday.
September 19 1987 was a Saturday.
Any day of the week that you like. Just pick an appropriate year.
19 April 1979 was a Thursday.
April 19 1933 was a Wednesday.
19 April 1775 was a Wednesday.
April 19, 1999 was a Monday.
19 April 1964 was a Sunday.
April 19, 1951 was a Thursday.
19 April 1995 was a Wednesday.
It was a Thursday.
April 19, 1956 was a Thursday.
April 19, 1958 fell on a Saturday.