Monday.
You can find a day of week calculator at this site. Just enter in the date and it will calculate it for you:
http://www.searchforancestors.com/utility/dayofweek.html
Exact, credible information on Draco is hard to come by, however he is mentioned as being involved in The Battle of Kosovo fought in 1389 on St Vitus' Day, June 15.
No, Father's Day in Mexico is the third Sunday in June. The date can be June 15 to June 21.
15 June 1978 was a Thursday.
15 June 1950 was a Thursday.
15 June 1952 was a Sunday.
15 June 1956 was a Friday.
June 15 1979 was a Friday.
June 15 1949 was on a Wednesday.
June 15 1940 was a Saturday.
June 15, 1943 fell on a Tuesday.
June 15 2010 was a Tuesday.
June 15 1971 was a Tuesday.