Great site, but....10th August 2300 is a Friday. Your test says that it is Thursday. Pasted below is taken from the test

On which day of the week is August 10, 2300?


Correct answer(s):
Thursday

Correct answer verified by http://www.timeanddate.com/date/weekday.html

Siento rectificar tu dato: Será viernes. Saludos. P.D. Me gustaria conocer los códigos del siglo 2000-2100 y sucesivos, así como del siglo 19. GRACIAS.

I second Steve West's comment.

I got Monday for June 11, 2300, and the answer came out as Sunday.

Otherwise, I love your site - it's simply ninjalistic! Thanks so much for taking the time to educate us!

Hey, why sometimes its minus by multiples 12 n multiples 28? can you guys tell me how ?

N i have tried January 11, 2020 which is January = 6, 11 = 4, 2020 = 4
So, 6 + 4 + 4 = 14 - 7 = 7, but 0 is sunday , 1 is monday... What day is 7?

Daphne, the day is Sunday! Remember that any multiple of 7, you can drop it which is like saying 0, so June = 3, the day is 11, 3+11=14, which is a multiple of 7, drop the 14, which is just like saying 0 and 0 = Sunday

@Ary Raditya..Whenever you're working in January or February dates in a leap year, you need to reduce the month code by 1 to compensate. Effectively the extra day, February 29, hasn't happened yet, so we're subtracting one to adjust for that fact. January becomes 5 (6 - 1) and February becomes 1 (2 - 1). So 5+4+4=13. 13-7=6. 6= Saturday

@lashon shaffer. Sorry, but you're wrong about 11th June 2300. Daphne is correct - it IS a MONDAY
2300 = 1
JUNE = 3
11 = 11
= 15 = Monday

Backed up by
http://www.calculatorcat.com/free_calculators/day_of_week.phtml
http://www.timeanddate.com/date/weekday.html
http://scphillips.com/cgi-bin/day.cgi

All agree that 11th June 2300 is a MONDAY

Found an error in the quiz:
On which day of the week is February 9, 2200?
I put Sunday
Correct answer as shown in the quiz: Saturday
I kept checking my work then finally looked it up online and everything I see shows it to be Sunday. If it were a 00 divisible by 4 I could see how I would need to subtract 1, but this isn't the case.

Anthony Neubert you have to check it here http://www.wolframalpha.com/input/?i=February+9%2C+2200 ..
February=2
9=7*1+2
2200=0+3=3
2+2+3=7=7*1+0
0=Sunday

June 12, 2019
June = 3
12 = 5
2019 = 4
Sum = 12-7 = 5
should be Friday but it is wednesday

Puliti Chhabra, no, it should be Wednesday and it is.
2019 = 9 (2016 --> 6 + 3 = 9)
9 + 3 + 12 = 24 --> Wednesday

@lashon shaffer

But the year is 2300, so you need to add 1, so it is indeed Monday.

Error found: September 1, 1900 was a Saturday, not a Friday.

March 27, 1800 was a Thursday, not Wednesday.

Also, 12/31/2100=Friday

According to your algorithm 23rd feb 1924 should be

23=21+2=2
+
feb=2
+
1824=2+3 (2024=2, 1800s = +3) =5

Which gives a total of 9 which equals 2 = Tuesday. Yet 23rd feb was a Monday in 1824. Where am I wrong?

@endru: Subtract 1 for January in a Leap Year:

2/1/1824

February = 1
23rd = 2
1824 = 2 + 3 = 5

8 = 1 = Monday

(For January and February in a Leap Year)

This calendar does not take into account that the years 1800, 1900, 2100, 2200, 2300... are not leap years. They are multiples of four, but per the Gregorian calendar centuries are not leap years except for every fourth century (1600, 2000, 2400 which are). I found a similar issue to everybody else for March 29 2100.

Lots of comments here regarding the '00 years that are not leap years. Here's the simple explanation for figuring out these codes. We know that a year ending in '00 has a year code of zero. So all we have to do is make the correct adjustment for the century. We know we have to add 5 for dates in the 1700's, 3 for dates in the 1800's, and 1 for dates in the 1900's. This means that the year code for 1700 is a 5, 1800 is a 3, and 1900 is a 1. That's it!

I can't uderstand how to calculate the year and the date??

Hi, there is an error for 1900 March 6 : it says the answer is Monday but the correct answer is Tuesday (I asked Google)

2200 March 8th is not a Friday but a Saturday

Seems there are errors for many 00 dates. Quiz told me that June 1 1900 was a thursday while I had calculated it to be a friday. Spent five minutes trying to find out what I had done wrong and then checked the date here: https://www.google.az/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=what%20day%20was%20june%201st%201900

Anyway great site and thanks for this method :) Will be practicing it a lot.

Haha, this is fun. Will be sick to act all Rainman when you ask someone new their birthday. Did Rainman get laid?

Works with whatever date in the future. Heres how i go about it:
kind of far away lol ---> 18 of june, 49 449.

1) 49 449 Has to get to a range were comfortable with to be sure. 494xx has to get to 16xx-24xx... 494 - 400 = 94 ... 94-40-40 =14, så now were in 1400s, just add 400 and get to 1800 so thats 1849... and now its the same)
---> Year is the same as 1849

2) Year 1849 = 2049 (to work with)... 49-28 = 21, so we know 2020 is 4, so 2021 is 5
--> YearCode = 5

3) Date is 18
---> Date = 18
= 5 + 18

4) Month is June and thats got the value 3
---> MonthCode = 3
= 5 + 18 + 3 = 26

5) Know the next three centuries after 1600-2000-2400 adding 5-3-1 for each after, so adding 3 for 1800
---> CenturyCode = 3
= 5 + 18 + 3 + 3 = 29

6) Easy converting from 7x
---> 7-14-21-28
= 29-28 = 1 --------------> fucking MONDAY, hope man live that long

https://www.wolframalpha.com/input/?i=On+which+day+of+the+week+is+18+of+june,+49449

Thank you for this, I've been able to impress multiple people by using it, and I practice right here multiple times per week. I believe I've discovered an issue for the first time after years of using this. I got the date May 1, 1700. I calculated Saturday, which Google agrees with. The quiz said the correct answer was Friday. Is there a problem with the quiz? Thanks!

Thanks for this lesson. I love this so much. It's already become a great conversation starter for me.

I have one request. Any chance you can make it so that I can quiz myself on multiple dates at a time? Like, instead of only having one date for each quiz, can you make it 10 or X. I'm having fun keeping my chops up, but it's a pain quizzing myself on 1 date at a time.

Your last quiz got a few wrong. Latest was Feb 5 2300. It's a Monday. Quiz said it was a Sunday. I think the quiz isn't accounting for the skipped leap-year in years divisible by 100 but not divisible by 400.

Feb 5 2200 incorrectly identified as Tuesday. Should be Wednesday.

I have had tons of fun with this. Thank you so very much! I'm still new at it and not too good with many 21st Century date codes. I may have come up with something that is easier to remember--IF CORRECT. Every leap year, the code jumps by FIVE. So if you have the rule of twelve down (and that's easy) why not just add five to get to the next leap year and then add one for each year after the leap year. EX for 2041: Start with 3 for 2036; add 5 to get to 2040 = 8. Add one for 2041 = 9. Drop the seven and the year code =2. Is that not simpler? And would this method (combining your "Rule of 12" with a "Rule of 5" work at least thru 2099? Toim

I think i found an error on question: On which day of the week is November 21, 2100?
i find that to be Sunday, as does google, but the quiz says the correct answer is Saturday?

My working: 2100 equals the same year code as as 2000, so 0, then add 5 for the century code.
add this 5 to 21 is 26
plus value of 2 for november = 28 = 0 = Sunday

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Great site, but I think there's a glitch in the algo for the non-leap 00 years. It seems like several commenters have pointed it out already. I just solved for November 11, 1700 as a Thursday, but the site is saying "Correct answer(s):
Wednesday". I doubled checked other sources, and Thursday is correct.

Curious - the formula says 1600 to 2300. Does it not work for years before 1599 and after 2400?

On which day of the week is August 22, 2092?
Using the formula:
1 + 22 + 8 = 31 - 28 = 3 which is wednesday but actually is friday.
Am I doing something wrong? Because I don't think so...

2092 is 3, not 8. 92-84 = 8 -> 3. So 1+22+3 = 26 = 5. Friday.

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I've got this down now and it's fun! However, I have an issue Feb 25, 2156 coming out to Wednesday. I get Thursday. I add 2 (Feb) + 25 + 0 (2156), +5 (the 2100's), and that totals to 32, which reduces to 4. That's Thursday. But in the exercise above it says it's Wednesday. And Google Alexa says it is Wednesday too. What am I missing?

In a leap year, you need to reduce the value for January and February. So in this case, February becomes 1, not 2. Thus, Wednesday, not Thursday.

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