4 days after Sunday is Thursday and this is the day before yesterday. Yesterday would mean you have to advance one day, the day b/f yesterday means you have to advance two days. So the day is Thursday + 2 days or Saturday.
If Sunday is the first day the Tuesday is the third day. If you think Monday is the first day the Wednesday is the third day.
January 1, 2001 was a Monday and if you assign each day a number starting with Sunday as 0, you can use the number 1 for Monday in this equation. Each regular year pushes the day of the week of January 1 one day forward and each leap year pushes it two days forward. There are 25 leap years between 2001 and 2101 and 74 regular years. Therefore, the equation would be [1 + (25 * 2 + 74)] mod 7. The answer is 6, which is Saturday according to the assigned numerical value for days.
December 22nd
In airline timetables, day 1 typically refers to the first day of the week, which is Sunday. This convention is commonly used in the airline industry to organize flight schedules and operations. Therefore, when you see day 1 in an airline timetable, it is most likely referring to Sunday.
The 9th December 1971 was a Thursday.
It was a Sunday.
December 2, 2001 was on a Sunday.
It was a Sunday.
December 16th, 2001 fell on a Sunday.
December 25th, 2004 was a Christmas Day that fell on, Saturday.
December 13th 1971 was a Monday.
April 4th 1971 was a Sunday.
May 2nd, 1971 was a Sunday.
December 13 1970 was a Sunday.
It was Sunday.
It was a Sunday.