April 4, 1980 fell on a Friday.
Dates are written month/day/year in the US and day/month/year in most other countries. June 4 1980 was a Wednesday, and 6 April 1980 was a Sunday.
4-6-2001 was in the first week of April. The day was Friday, April 6th.
Saturday
4 April 1995 was a Tuesday.
4 April 1964 was a Saturday.
April 4, 1977 was on a Monday.
April 4 1975 was a Friday.
April 4, 1914 was a Saturday.
April 4, 1988 on a Monday.
April 4 1985 was on a Thursday.
April 4, 1951 was on a Sunday.
April 4 1950 was on a Tuesday.