How to Calculate The day of the week from the Date in Seconds.(Calendar Problem). Mental Maths- 11

In This video we will learn the famous Calendar Problem trick that a Human Calculator guy performed in Asia's got talent , In which we can swiftly calculate the day of the week from a date.

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[chopeeehusseinfj]

You are a really really smart person, most of my math problems are solved by you, Love from Fiji Islands, Thank you and stay Safe.

[vedanshabcdefghiklmnopqrstuv]

very cool trick, thanks mathOgenius, you are actually a math genius :D

[divyanshtewari]

I honestly think that u shud go to any of the TV program where maths is given importance❤️
Go 100K Brudah...!!

[skobeloff]

Sir, You are the one of the finest math's teacher on YouTube... :)

[thecalendarninja]

The easiest way to do this is to prememorize all 100 year values from 00 to 99. Then I just add that to the century code and reduce mod7 and finally add that to a prememorized value for each of the possible 366 dates. For example, June 15, 2012 would simply be:
2+2+1=5, so Friday!
June 15 always has a value of 2 (prememorized)
2000's has a century code of 2
and,
year 12 always has a value of 1 (prememorized)
2+2+1=5, Friday!
Anytime leapyear happens just subtract one from the answer for January or February only, all other months stay the same!
I calculate any day of the week using my method in less than a second, almost instantly to 2 seconds tops if I'm thinking a bit. I do both the Julian and Gregorian calendars in both AD and BC infinitely into the past or the future.

[sehjat]

Thank you so much! I just started watching 5 mins ago and I love your content its so help full to me especially because I suck at maths and I hate it but you explain so so so so well it makes everything so so so so much clear than before!! you deserve a sub and like! I think we need more people like you! keep up the good work! :)

[kaiji]

I wanna ask if there is a fast method for multiplying, adding, and subtracting decimals

[utubesaha]

Every 28 years the calendar repeat itself. Hence the first step for year should be to subtract 28, 56 or 84 from the last 2 digits of the year. Adding 25% to get extra numbers is amazing. Wish I knew why it works

[RaldinCasidar]

Oh, I accidentally viewed this video and Im a software developer and this trick/algorithm can help me a lot in the future. I didn't know this exists. Thank you so much!

[yugathdewdisa]

You are amazing!! TYSM!! Lots of love from SL

[chandrahasreddy]

Can you give some tips tricks for fast multiplication and division of point numbers (like 1/99=?)

[rajkaran]

Your flow of video is got damn good now! ;)

[danieltavera]

@mathOgenius hi i love your videos! verry cool but im trying to do one of my siblings dates which is july 20, 2010 but im getting monday but the calender says its tuesday could you please see if im doing something wrong thank you!

[fashionista_]

Maja aa gya😁
Bhut maja aa rha hai ase tricks sekh k
Mehrbangi sir ase bedio upload karna k lee a🙂

[firozahossen]

Shall try to do stay blessed thank you for sharing from Sri Lanka

[yuvnag.]

I have recently found your channel have to say You are amazing 👏😉😀

[kazawolf]

Hi great video. What do I do when numbers are very low, like 2000–2005? I get fractions when I divide by 7 at the end

[icebear]

Oh My Goodness This Guy Is A God For Me Cuz I Used to Hate Math​ and now I love it. Thanks! My guy

[dhruveshjaithwar]

How to find dates before 1752 considering the eleven day lag?

[glockglock]

Can you do July 4, 2024. It's a leap year, so based on your computation, you have to deduct 1. So 24 x 1.25 = 30, then subtract 1 which is = 29. Then 29+5+4 = 38. 38 divided by 7 = 5 with a remainder of 3. So it should be Wednesday. But actually, looking at the calendar, it is actually Thursday. Can you explain further? Thanks!