Find what day (Mon, Tue, Wed...) was a certain date. For example April 15, 1985 was a _________ (Mon, Tue,....)?
2007-05-14 18:10:48 · 5 answers · asked by R B 3 in Science & Mathematics ➔ Mathematics
Not really a formula, more of a process - http://www.jimloy.com/math/day-week.htm
this explains it further
2007-05-14 18:30:37 · answer #1 · answered by Alex M 2 · 0⤊ 0⤋
if you look at your computers watch... and add a year... the day will change +1 day for each year and +2 days for each leap year
2006 - 1985 = 21 years
So.... leap years were
2004, 2000, 1996, 1992, and 1988 were leap years.
21 + 5 = 26 day shift
April 15, 2006 is Saturday
April 15, 1985 is Monday
So 26 / 7 = 3 with a remainder of 5
5 days before Saturday is Monday.
2007-05-14 18:42:24 · answer #2 · answered by andrewbison 2 · 0⤊ 0⤋
There is a formula, or algorithm. Because of the different number of days in a month, and leap years, it is pretty complicated. Essentially you need to convert the date to a serial number and divide by 7, saving the remainder.
Excel has a function which will do this for you.
2007-05-14 18:44:21 · answer #3 · answered by Helmut 7 · 0⤊ 0⤋
I do not believe there is a formula. look up a calendar, maybe the internet.
2007-05-14 18:23:27 · answer #4 · answered by horse 2 · 0⤊ 0⤋
No formula...just look at a calendar, I guess.
2007-05-14 18:19:21 · answer #5 · answered by victoria 5 · 0⤊ 1⤋