How we worked it out
Updated as you change the numbers.
- Count days from a known reference date and take the remainder after dividing by 7.
Method and assumptions
The weekday follows from counting days on the Gregorian calendar (in use in most countries since 1582, in Britain and its colonies since 1752). ISO week numbers start on Monday, and week 1 contains the year’s first Thursday.
Questions
What day was July 20, 1969?
A Sunday.
Sources
Method and figures checked on . Every worked answer on this page is covered by an automated test. Found a mistake? Tell us.