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- เผยแพร่เมื่อ 28 ส.ค. 2024
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I am so grateful for any support you choose to give, financial or emotional! 🙏 This week I thought I'd learn the "doomsday" algorithm which allows you to tell what day of the week any date will fall on. Turns out it's not too difficult!
The @numberphile video I learned this from: • The Doomsday Algorithm...
My name is Mike Boyd and I make videos documenting my process of learning stuff really fast. Subscribe for more upcoming videos and feel free to tell me what you'd like me to learn next in the comments.
Instagram: / mikeboydvideo
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Camera Work: Kim Boyd
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Plot twist: He has a 1 in 7 chance of guessing it, and he's just extremely lucky.
WOAH WOAH WOAH!!! Let me get this perfectly straight: You comment something that is completely unrelated to the fact that I have two HAZARDOUSLY HANDSOME girlfriends? Considering that I am the unprettiest TH-camr worldwide, it is really incredible. Yet you did not mention it at all. I am VERY disappointed, dear n
@@AxxLAfriku he is back. once more AxxL appears for us
duuuude this is such a cool trick, i was smiling like a looney on the subway
he has dreams luck
haha man perfect comment
Became inspired.
Learnt it in 1,5 hours.
Told everyone I memorized whole calendars from 1700 to 2499.
Now girls can't leave me alone.
🥶
Sheeeeeeeeeeeesh
clever
sheesh
What math does to a gentleman
You should make a tier list of all the skills you have learned over the years! You could rate them on usefulness, fun and difficulty!
Oh this is an interesting video idea
cool idea
what are these replies from the bots
that's right. 10000% right!
@@nikmrn already reported them. You should too
Fun fact : 1700, 1800 and 1900 are not leap years, but 2000 is.
Every hundred years, if the year in question can be divided by 100 and by 400 then it's a leap year (1600 and 2000 for example). Otherwise it's not.
Found that by accident while training :) Thanks for the great skill Mike!!
Pretty funny u found it by accident 😂
Every 4 is
Every 100 isn't
Every 400 is
Every 4000 isn't
Just in case someone asks you a far flung future date:)
Neil Degrasse Tyson has an of the cuff explanation about this on The Joe Rogan Experience.
The Gregorian calendar was designed to accurately keep the solstice from drifting over time (like the previous Julian calendar) so those rules remove a leap-year every 100 years coz now there's too many days and add one every 400 coz now not enough and again remove a day every 1000 coz too many...
All of that done by priests with a firm understanding of maths and astronomy...
And some dbags still think the world is flat 😔
Damn Y'all motivate me more to start learning this trick.... should I, even tho I'm not the best at maths?
@@businessisboomin7252 u dont need to be good at math , u just need to practice this trick well
Its crazy how helpful the Numberphile video is in learning this trick. After watching it, it took me less than an hour and now I'm getting it right almost every time! The leap years are the trickiest part.
hey blue
I love your videos Blue!
agreed, learned it the day that video was released hehehe
Yo hey blue!!
@@applewater5642 Blue as in 3 Blue one Brown?
Love it when people find out about the beauty of modular arithmetic
What is that
@@davidbengb8484 th-cam.com/video/lJ3CD9M3nEQ/w-d-xo.html
My great grandfather had dimenta. He asked my grandpa (his son) what day he was born. My grandpa told him and he stayed quiet for about 40 seconds and says "you were born on a Monday". He was a smart guy.
@@user-pe5zv2mm2l lol
dimenta :D
Very realistic story... I can say this by how a father didn't knew his son's birth date...
@@raghvendrasinghsengar8360 He had dementia smart guy
@@raghvendrasinghsengar8360 Cambridge wants to know your location
the last day she chose on the intro is my birthday (though a thousand and 40 years in the future) which i already thought was a funny coincidence, but then he said it was a monday, which is the weekday i was born on, and so i felt like the title of the video had just been proven to me, specifically
"Tunnel into the quantum realm" with the dotted chalkline trick. . .very meta.
Also, I liked the reverse learn quick scenario of this video. Starting with mastery and working backward to show the process. Great Jorb!
you're right. unequivocally right!
Great jorb indeed
@@___wij indeed it was
I was trying to follow along and I completely lost it at "quantum realm" hahahahhaha
4:52
I've actually tried nearly all of your stuff. I never did the rollers on the bike because they were expensive, and I'd love a penny-farthing.
To date, I can: break an apple in half with my hands, the chalk dots (literally first try), Rubik's cube, Rubik's pyramid, bunny hop, dice stack, card throwing.
I've also learned: lots of magic tricks (Chris Ramsey tutorials), riding a unicycle, walking on my hands, coin rolling, cartwheels, 1 handed, then no-handed.
1 thing I cannot do is juggle and it pi**es me right off. Keep up the videos I absolutely love them and love to learn.
Update on the juggling?
@@jaredf6205 He seems to be pretty good at juggling discovering this stuff and learning to do it
Epic dude! Keel it up
4:50 it makes me heart feel good that you can still do the Chalk thing.
I love this video!
Ayy it’s James Grime! I agree with this vid. Your explanation on Numberphile was great :)
Hey James! Thanks for everything you do :)
Me too
It was about 15 years ago when I First encountered with this method.
There was an elderly guy always sitting in front of a shop watching people passing by. My schoolmates and I used to walk pass him on our way back home. He used to ask us for a random date and would have told us which day it was instantly.
I really started appreciating his talent after I read about the method in a math tricks book I got from the library. Not gonna lie, Since then I always felt sorry why such a talented mind has to just sit on a street all day everyday.
Your old mate was just Isaac Newton in disguise enjoying his retirement startling the young 'uns!
:)
Why feel sorry? You don't know if he was enjoying himself or not. Life isn't about accomplishments and "doing". Maybe he was in a bliss we'll never know.
anime sensei right there. I'm pretty sure he's producing oxford worthy students somewhere out there in a dojo up in the mountains.
Wow
@@The_Rising_Dragon I was going to say, "It was John Conway."
There is a guy here in Ghana who calls himself "computer man" he's been doing this for as long as I remember, plus his speed and accuracy is quite legendary. I understand it's mathematical in nature.
The only thing I really learned from the video: Mike is left-handed 😂
haha dude awesome
@@DannySullivanMusic 🤜🤛
He should try learning to use his other hand.
I've seen this in an old mentalism book long time ago but never tried it because it felt too complicated. I actually tried today after watching this video and after 2h it feels so easy to do, thank you so much 👍🏻
That is impressive!
@emelia omg yrwsz thank you
yes. unequivocally correct dude
Ye
no it’s not, it’s very easy you can learn in less than an hour stop being dumb
Alternate Title: "How to properly credit people". Its great that you didn't just encourage your audience to watch the video, you almost require them to by not just summarizing his own work. I can't explain it but this really puts a smile on my face.
Mike is getting too overpowered 😂
Mike's too OP!
Devs, nerf pls!
hehehe pro comment
@@jpizzleforizzle yeah put a nerf into the next patch pls
Knowledge will increase... Bible spoke about this before it happened..
This reminds me a lot of learning subnetting for computer networks. Being able to determine quickly determine the CIDR or decimal notation of a subnet mask, the available host addresses, etc. is the network engineering equivalent of this lol.
Great to see Mike drawing a dotted line on a chalkboard again 😂
Ye i noticed as well 😂
Yes! I just commented this as well lmao. It was like one of his first videos
Noticed that too, it was the 1st video I watched of him as well xD
I'm more impressed by this than the math!
Mike! This was fantastic! Grimes is a great presenter and it would be really cool, if you could share the spreadsheet!
Did you ever find the spreadsheet?
@@ZinkZoodles i guess not :(
John Conway (famous mathematician, though to the general public mostly known for Conway's game of life) who invented this method set up his PC so that it would ask him a question like this every time he tried to log in and would only let him pass when he answered it correctly. Eventually, he got so good at this that he was able to do it in under 2 seconds for any date.
I heard he was great at parties since he knew quite a few tricks like that.
Wow that’s so cool!
We need an app for it. I'd spend bored hours trying to perfect it
@@MarkusAldawn I'm gonna to make a program to do this maybe not an app but just an exe for myself.
@@brotherbumkin3010 would you be willing to share it once it's completed?
@@MarkusAldawn I’m gonna write a script for it to practice
Kim is such a good audience. Her reaction is great :)
I have enough trouble remembering to breathe, let alone delving into the quantum weekday realm.
Ok
lolll very nice
3:54 Im more impressed on the way he counted and lift is ring finger without moving his pinky a long with the motion
on god
Pretty easy
My Maths teacher did this on my first lesson with him. He taught us, but I had since forgotten all about it. Thanks for bringing back the magic for me ❤️
I just wanted to say. Thank you for being a part of my personal journey in life, Mike. This video put a smile on my face.
I watched the numberphile vid eariler when it released and I loved this trick! When I saw this title and when you started guessing, I paused and calculated it in my head and unpasued to see if it was right and I was right! Granted I'm still show so I took a minute for each date, but it still felt great!
It's okay to be smart also made a video
i have a doubt, how to know how many leap years to add 10:41.. i'm really confused please help me
@@mahiiii2112 The numberphile video explains everything clearly, but I think we just divide the year number by 4 to get the number of leap years
That explanation was amazing! I got lost around the quantum realm, but the dotted line helped me stay with it.
Yep he can still do the "dotted line on a chakboard 4:53
Just waiting for your comment
It was right here I realized I needed to go back and watch that video.
I once knew a 5 yo kid that has savant.
He can do it without using math.
When asked how does he know the day of the week by the date, he said "I just see it in my mind"
she even wrote 11 'th' for the Americans who would probably think its 6 November 😂
The six of Novemberth of course!
@@hetsmiecht1029 😭
coolest part was the dotted line with the chalk lol
I really admire your dedication to learn all these random skills!
He’s taking the current calendar and factoring in leap years, going backwards. I’m sure at first you’ve got to write it all down. But as he got better he could do it in his head.
I've never seen a date written out in this format. Yeah in the US it's month/day/year. In most other countries, it's day/month/year. So that part isn't odd. But writhing "th" after it but still doing the slash format, is what I've never seen before.
I'm from the UK - no one does that here either haha. She is unique.
@@AJ_UK_LIVE maybe they decided to write it like this due to the global audience. It takes away any of the ambiguity about the date, although I agree I have never seen this before.
@@rabg4774 You may be right. And it does make it easy to understand no matter what.
No doubt they did that to cater to the Americans…
@@Twas-RightHere Wouldn't they have just said "December4th 2021" instead? Removes the questioning for the various formats from country to country... and is more common? In the US and Canada this is a common way to verbally say a date.
Either way not a big deal. I'd just never seen it. :)
Another method : a year is 365 days =52 weeks + 1 day, so year by year the day count advances by 1, and by 5 in a 4-year block (accounting for leaps). But divided-by-100 years don't have leaps, so that a change of 124 or 5 for 100 years after removing 7s, but divided-by-400s do, so 400 years have a change of 500-3=497 or no change.
Things to remember : 1st jan 2000 was a saturday, and that 31-day months advance day by 3, and 30-day months by 2. Feb normally doesn't change as it is 28 days, but +1 in leaps.
Go.
I knew someone who could tell what day it was, wat he was doing, what was in the news and what weather it'd been on any date you gave him! Absolutely blew my mind
I would like to imagine that this trick also applies to the future.
Yes, you are not good at explaining but I came to know about this through you so keep doing because I am learning new skills because of you.
What I learned today: when AI eventually creates the matrix, Mike Boyd will become the chosen one to free us all.
Or if humans are capable of this, and AI will inevitably be smarter. This only means we can't comprehend how smart they will be :(((
You've inspired me to learn this a couple of day ago. Although I learned it very quickly it will definitely need a lot of technique and practice to get faster. Also, similarly to you, I've made a little program/game for practicing this.
Awesome video as always
“Then you tunnel into the quantum realm” ~Does that chalk dotted line trick~
Why did I find that so funny?
I’m definitely going to learn how to do this next time I have an exam to study for
I just found a new hobby lol. I'm loving the fact that it was so easy to get used to the algorithm after 10 tries. It really was enough to get through all the special cases and tricks that can be used. Awesome! Thanks for this video!
Worked with a guy with special needs at a home for people with disabilities and he had this ability. We would introduce him to new staff by having them tell their birthday and year and he would think hard and ALWAYS get it right. It was a cool ice breaker. We gave him a fake date once, I believe it was a leap year and day that never existed and after thinking hard as usual he stood up and jumped and said "No, No, No" with a huge smile on his face. Watch the movie Rain Man and it's basically his character. He loved dates and days. Also TV Program guides. Newspapers. A lot of other date related things.
I got into your vids a few months ago and I was amazed! But you seemed to take a short break right after. I'm so stoked that you're back at it again! Keep it up my friend! I'll watch every single vid you put forward. You're an inspiration, I'm already working on my juggling
I've learned this and I can tell you it's really cool showing this to people and seeing them looking at you like you're a freaking genius
yeah thats called being freaking egotistical
Totally gonna learn this 😂
Ye
I'm sure we've all seen those videos where someone with autism is extremely skilled at a very specific thing. For example, that man who can fly up in a helicopter and perfectly recreate the landscape via a drawing. My friend's cousin has autism and he's been able to do this day of the week thing his whole life. You ask him "hey, what day of the week was xx/xx/xxxx," and he'll move his fingers around for a few seconds and tell you exactly what day of the week it was. Absolutely incredible.
Bro he’s got like a superpower. That is so cool
the calendar was changed from Julian to Gregorian in 1752. When looking at days of the week for dates before that, the internet has mixed results. you should try dates before 1000 and see if you get it right. I couldn't. the Doomsdays before 1700 have a pattern of Tue-wed-thu-fri-sat-sun-mon and so on. the pattern we saw on Numberphile was Tue-wed-fri-sun. What do you think?
This is the most determined and dedicated man i have ever been blessed to witness
On the 5th of September in 2056, Mike has aquired every skill, what day is that mike?
That’s my birthday!
Tuesday
@@shivambansal42 thats a big coincidence
Shivam Bansal whoa that’s pretty cool. Its also pretty cool that I recognized your name as the multi blind ex world record holder.
@@columbus8myhw chewsday init
Numberphile is REALLY good at taking complex math and breaking it down simple enough for people to understand
3:05 The progression of my math classes' curriculum throughout the year; beginning, easy to follow, end, impossible. 😂
Now I know my birthday in the year 3062 will be on a Monday. Can't wait for that birthday
Is there anyway you can share this spreadsheet so we can practice?
Or make a tutorial so we can make it ourself.
@@Zorpho86 its not hard, use th-cam.com/video/7kRCVp1Ia1o/w-d-xo.html and th-cam.com/video/mrwWPz_hZ1c/w-d-xo.html to generate the dates and the days
I've been using a bit of a different system for the last 15 years. It follows what I call the 4206 rule.
Each century is assigned a number, either 4 2 0 or 6.
18th century is a 4, 19th century is a 2, 20th century is a 0 and the 21st is a 6.
This repeats into further centuries. Let's pick a date December 25th 1950. 20th century is a 0. Then I take the last two digits of the year "50". To account for leap years I divide the 50 by 4 = 12.5. This adheres to the 1461 rule "meaning every four years there will be 1461 days" regardless of whether the year was a leap year or not.
This is rounded down to 12. 50 + 0+ 12 = 62. Next I add a value assigned to a specific month. Jan = 0 Feb = 3 Mar = 3 Apr = 6 May = 1 June = 4 Jul = 6 Aug = 2 Sept = 5 Oct = 0 Nov = 3 Dec = 5 and finally I add the date of that day. When I calculate a date I calculate the sum of 5 variables. 50+0+12+5+25 = 92. If a number is divisble by 7 then it falls on a Sunday. The remainders count for the remaining days of the week. For example: December 25th 1950 is 92 meaning it was a Monday.
Honestly I didn't know this was a learnable skill, I guess after seeing rain man do this I just thought it was a thing only a savant could do.
Just learnt this from the numberphile video because I saw this one, I’m not very fast but it’s extremely pleasing to get it correct
Can you link the spreadsheet so we could practice this?
Up
If you want this too like and comment this comment so he’s more likely to see it
I'm facing the issue to generate random dates. Once that unblocked, it's quite easy. I comment to up the message... and maybe find someone who can help?
did you figure it out?
Numberphile is a gift that keeps on giving.
So are you, Mike!
This is amazing, one of the skills you've done that I want to learn the most 😅
Thanks for telling us about numberphile's video, i just went and learned it in like an hour
Have you ever seen the female savant twins who can do this ? They don’t follow any math strategy to work it out they just know the date. Really cool
I guessed my weekday i was born on. My intuition was on point
Also, awesome material. Thank you so much for making these videos. Always inspiring!
I've just watched the video and got started. After around 30 minutes, I've gotten my time down to under a minute as long as it's a date within 1700-2400.
He really threw in the dotted lines on the whiteboard for an extra flex
This is cool. Like people who know how to flip a coin and can call it correctly dozens of times in a row. But basically everything you do no matter what is 50/50, either you are right or you are wrong! I like the nerdy stuff though, first time I got excited in school about something was in junior high when the teacher would play this game and just rattle off different things and you would have to raise your hand fast and answer it, she would say 7 times 7 plus 2 divided by 3, and on and on and made them harder, only me and two other kids played and it was fun and competitive and the rest of them just sat there waiting to leave. I also want to learn a language in a few months so I am glad videos are popping up for that type of stuff along with this.
this is amazing. impressive skill learned, mike.
Was going to sleep but watched this video and got to learn that trick. Now I know how to do it and will sleep less.
Please share the spreadsheet!! I really want to practice this! Super cool vid :)
@Arjun Khemani
No :/
You saw it in the video, just replicate it bruv
Did you ever find the spreadsheet?
@@ZinkZoodles nope...
This is pretty simple but a cool trick to impress those who aren't good with numbers.
Hey Mike, I also watched the numberphile video when it came out. You inspired me to learn the skill! Out of curiosity, how long does it usually take you to calculate the day?
Dude I learnt this to be cool, and everyone hated me after a day
Bro I was born in 11th of June and I was genuinely terrified
I was born on a thursday, good vid btw.
Just like you i am also an expert with the days of the week.
I know about leap years and for example if something like february 11th was on a sunday, that would mean next year it would either be monday or tuesday depending on whether its a leap year. It just contains calculation tbh. So glad we finally got a challenge like this, keep it up!
We want the spread sheet :)
Would love to see your process of working! Awesome video. I sat down a couple of hours yesterday, using your method, and can now tell the day of the week at any given date! Thanks!
Such a great video! I'll definetely try it out :D Thanks for your amazing and inspiring videos, Mike (+team) 😀🤩
Crazy how this studying method can be applied to anything that we do! Speed is the key to mastery!
Hiya mate.
Any chance of sharing the spreadsheet for us to practice?
Yes pls do this
Did you ever find the spreadsheet?
@@ZinkZoodles
Afraid not 😕
You literally make me want to learn all these things.
Can you share the excel doc for practice(answers blank preferably) thanks!
Edit- made it more specific
Edit 2- I have one of my own but I don't know how to share it, since links get taken down.
YES PLEASE
@@octogintillion i kinda made me own, if you wanna see it
@@vincenthernandez I would be really grateful to have it
@@vincenthernandez Can i please have it too?
I will make a link for it once I write directions!
You need to do a video teaching us how to do that dotted line at 4:52
when you don't realise he already made a video about it.
@@matthewsied7352 i realised shortly after he made it about 4 year ago…
Mike: it’s not complicated
Mike: yeah you basically get every single grain of sand from the 752nd beach ever made and add it by the amount of days until the date that the universe will die.
I learned this about 3 years ago when I was 10. I am glad You learned it.😀
are there certain things you've learned that you're more invested in keeping than others?
and do you have any tips for maintaining multiple different skills over time
My father in-law Mr. Abdul Hussain Moosa Merchant was a pro in this skill, way back around 50 years ago. We have still preserved his work and are extremely proud of his talent. He was nicknamed THE CALENDAR MAN!!! GOD BLESS HIM!! ❤️❤️
Impressive ✨✨✨
Hi
I don't even know what week I was born so thanks for your help.
POV: You’re watching this on 2/6/3062
James Grime is a legend. He's been to my school many times over the years to talk about the enigma machine, such a lovely guy
Can you also show us how to make a spreadsheet similar to yours?
Did you ever find the spreadsheet?
@@ZinkZoodles Sorry no he never made another vid with instructions
love the casual dotted line
There's 2 skills Mike has learned that when he started em I actually already kinda knew theoretically how to do em, just cuz of things I stumbled across in my life. One of em is the chalk dotted line shown in this vid, and the other is that card deck catch thing where u spring the cards in the air and catch them. Everything else on the channel is just waffle to me, it's so hard learning new skills
ok but who asked
@@Kevin_21 this ratio did
@@Rizwaan122 what ratio
This one is fairly simple, took me about 30 minutes, you should give it a go.
God bless you all and your families 🙏🏽✝️🛐🛐
Could you please share the Excell or sheets document you practiced on?
YES, PLEASE
Hey, I made one of my own which is pretty similar to his, would you like to have it?
@@HaninMohammed Yes please
@@andreaskwong5551 Hmm, how should I send it to you?
@@HaninMohammed Can i pleaase have it too? :)
Heya Mike, I learnt this last night. Thanks for the shoutout to Numberphile’s vid.
Would love to see you learn Mongolian throat singing!!