century+year+month+day=weekday
1 March 1959 was a Sunday.
2016 is a leap year but 2010 and 2021 are not.
2016 is a leap year but 2010 and 2021 are not.
In the US, that fell on a Friday.
August 1st, 2021, is a Sunday.
It is a Friday.
As of 2011, the next time January 1 will fall on a Friday is in 2021.
August 1 will next fall on a Sunday in 2021.
October 1, will next fall on a Friday in 2021.
As of 2011, the next time January 1 will fall on a Friday is in 2021.
March 1, 2060 will fall on a Monday.