The given date was a Saturday.
Father's Day would be the third Sunday of the month June, since the probable dates lie between 15th to 21st in June.
June 20th 1837 was a Tuesday.
On June 20th of 1968, the day was Thursday :)
June 12, 1998, was a Friday.
Saturday
June 20th
It was a Tuesday.
June 20th, 1961 was on a Tuesday.
June 21st, 2011... first day of summer. June 20th, 2012... first day of summer. June 21st, 2013... first day of summer. June 20th, 2014... first day of summer. June 21st, 2015... first day of summer.
In the U.S., it was the 20th of June.
June 13, 1998, was a Saturday.
In 1993 Father's Day was on 20th June.