By calculation (generator: ["day_week@trueknowledge.com"]) I know that:
Wednesday
is the day of the week of
May 13th 1970
Thursday
is the day of the week of
May 13th 1971
Saturday
is the day of the week of
May 13th 1972
Sunday
is the day of the week of
May 13th 1973
Monday
is the day of the week of
May 13th 1974
Tuesday
is the day of the week of
May 13th 1975
Thursday
is the day of the week of
May 13th 1976
Friday
is the day of the week of
May 13th 1977
Saturday
is the day of the week of
May 13th 1978
By calculation (generator: ["timepoint_when_day_happened_on@trueknowledge.com"]) I know that:
May 13th 1977
is a timepoint when the day happened on
Friday, the 13th of May and 1970s