How Math Can Tell You the Day of the Week for Any Date in History

Ғылым және технология

With a dash of math, know the day of the week for any date on the calendar.
The calendar is a mathematical object with regular patterns, such as leap years happening every four years. This results in your birthday increasing by one or two days as you go from one year to the next in a very predictable pattern. Using easy mnemonics, and by adding three numbers together -- derived from the month, date, and year -- the total yields the day of the week. This is a practical application of something called modular arithmetic -- in this case, we're adding and subtracting mod 7 because there are 7 days in a week.
For more: lifehacker.com/5848651/how-to-...
NOVA Facebook: / novaonline
NOVA Twitter: / novapbs
PRODUCTION CREDITS
Videography & Production
Ari Daniel
Original Footage
© WGBH Educational Foundation 2016
MEDIA CREDITS
Music
APM
Additional Imagery
Flickr/Dustin Liebenow
Special Thanks
Brunswick Junior High School
Peter Stevens' Class

Пікірлер: 215

  • @karthikdasaraju110
    @karthikdasaraju1106 жыл бұрын

    Yes there is a pattern for the code of years i.e for every leap century (800,1200,1600,2000) the code will be zero for every other than leap century i.e for 300-1, 200-2, 100-3 Now if the year is in 1800's then 1600(code 0)+200(code 2) Now if the year is in 1900's then 1600(code 0)+300(code 1) Now if the year is in 2000's as the year is a leap century code will be zero After this coming to 2 digits-for example if it is 2026 first, last two digits(-1) should be divided by 4 to find leap years and ordinary years so 25/4=6 (leave the remainder) so there are 6 leap years and 19 ordinary ones(25-6). Now multiply the leap number with 2 and ordinary with 1 and add them. at last get the remainder when the the sum is divided with 7. Example: 1951 1600(o)+300(1) 50/4=12 leap and 38 other 12 times 2+ 38 times 1=64 when 64/7 remainder will be 1 SO THE YEAR CODE IS 1600(0)+300(1)+50(1)=2

  • @acarvey
    @acarvey4 жыл бұрын

    Great video! Lots of other resources I went to were REALLY CONFUSING! I'll now be using this method in a school programming project to produce a dynamic calendar, thanks so much!

  • @ynnekthennek7009
    @ynnekthennek70098 жыл бұрын

    i hate how they don't want to give up the trick. they make it more complicated than it has to be. forget their month code and use the one i'll give you. you can master it this way in under an hour. its pretty easy once you get the hang of it. you have to add 4 numbers and divide by 7. add the year, + 25% of the year(or year divided by 4), + month code(033-614-625-035), + day of month example: March 3rd, 1948 or 3/3/48 = year =48__ the year divided by four = 12__ the month code=march = 3 , day of the month = 3 so 48+12+3+3=66 divided by 7 = 9 remainder 3 and 3 is Wednesday that works perfect for leap years, as long as the date is after feb 29 also, we used march 3rd, but you must subtract 1 if the date is before feb 29th on a leap year. it takes a little getting used to but its really easy once you get the hang of it. remember, leap years start in 2000, just like in 1900, for this century. just get good at the 1900's and you'll understand how the 2000's work a lot easier. you can get really fast in just a week if you work at it an hour a day. in the 200's you have to subtract 1 or 2 days from your final answer depending whether it is a leap year or not. all years divisible by 4 are leap years(1900, 1904,1908,12,16,20, . . .40,. . . 80,. . .88,92,96,2000,2004,2008,12,16,20) another example: jan 30, 1948 1/30/48; that was a leap year. you must subtract a day because it was before the 29th of february. walkthrough: 1/30/48 __ 48 + 12 + 0 + 30 = 90 = 84 w/remainder of 6 = Saturday minus one equals Friday. you must subtract one since the leap day wasnt added yet, because it is before feb 29, which would make it Friday, not Saturday. [for the remainders in years not divisible by 4, just drop the remainder] for the 2000's, you do the same thing, but now you always subtract a day from your final answer unless it is a leap year, then you subtract 2 days from your final answer so, after feb 29th 2000, you subtract 1 day from the final, but on or before the 29th of feb. you subtract 2 days from your final answer. i hope i explained it clearly. any questions, let me know.

  • @utpalenduhajra6386

    @utpalenduhajra6386

    7 жыл бұрын

    bro how to calculate 2nd oct 1869 using this method????

  • @ynnekthennek7009

    @ynnekthennek7009

    7 жыл бұрын

    Utpalendu Hajra its for 1900s. if in 2000s then minus one off final. if in 1800s add one onto final, so oct = 0+ 2+ 69+ 69/4=17 so 17+69+2+0=88 88/7=12r4 so 4th day is Thursday, but add 2 because it is in 1800s, so Saturday. remember, add the day of the month plus the last 2 of the year, plus the year divided by 4 plus the month number 033614625035. that works exactly for the 1900s. minus one for 200s and add 2 for 1800s and so on in either direction. you also have to remember if it is a leap year on a date before feb 29th then you must account for the day and minus a day off the last remainder no matter which century it is. leap years are always divided by 4

  • @WalterKingstone

    @WalterKingstone

    7 жыл бұрын

    How is this any easier than Arthur's method? If anything, it's more complicated...

  • @utpalenduhajra6386

    @utpalenduhajra6386

    7 жыл бұрын

    Yea bro i find another method easier than this method using century year like 400 300 200

  • @babythedude

    @babythedude

    7 жыл бұрын

    Will this method work if year is not divisible by 4? Why only use 1948 as examples? 1997?

  • @drtroyturner7464
    @drtroyturner74644 жыл бұрын

    A few people missed it, were asking so: The 21 came from adding the Month code which was 622 503 514 624 for months January through December plus persons chosen day plus year code of 4 for 2015 gives us a total of 21 because November is 2 plus 15 (girls birthday) plus 4 is 21. Divide by 7 but concentrate on the remainder. Remainder zero is zero day Sunday.

  • @dibajyotinag2338
    @dibajyotinag23387 жыл бұрын

    how he got the year code

  • @apoorvsingh_ASR

    @apoorvsingh_ASR

    2 жыл бұрын

    kzread.info/dash/bejne/fZuDysWgaZWslMY.html

  • @abingaming4274

    @abingaming4274

    10 ай бұрын

    Take the 25 percent of the last 2 digits of the year if it is in decimals take only the number part add it to the orginal 2 digits divide it by 7 and the remainder you get is the year code

  • @abingaming4274

    @abingaming4274

    10 ай бұрын

    If it is in 1900s add 1 to the year code 2000s 0 2100s 5 2200s 3 1800s 3 1700s 5

  • @Swirl_J07
    @Swirl_J075 жыл бұрын

    0:39 Me: [calls brother] Him: Yeah Me:found your twin

  • @drtroyturner7464
    @drtroyturner74646 жыл бұрын

    I give my volunteers the choice of 1950, 1975, 2000 and 2025. It seems perfectly fair considering you have alternating odd and even numbers spaced out equally and it makes horse sense that for the sake of time (not really), we need to narrow down what calendars that the volunteer will Google and isolate. No one need know that I just cut out much of my confusion by having year codes of zero, three, zero and three.

  • @lukeroberts1630

    @lukeroberts1630

    7 ай бұрын

    Just do any year

  • @josefwintzentlibot7852
    @josefwintzentlibot78525 жыл бұрын

    Today in AGT a Malaysian pulled impressively the Calendar Trick. The Calendar Trick is to tell accurately the day of the week any random date presented to. It is actually memory game with a little arithmetic. Just subtract 1900 to the year; add the date; add the number of leap days from 1900 till that date; then add 0 if it falls in a January or October, 1 if May, 2 if August, 3 if February, March or November, 4 if June, 5 if September or December, or 6 if April or July; and finally continuously subtract 7 unto it till the answer is less than 7. When the final answer is 0 it falls on a Sunday, 1 on Monday, 2 on Tuesday, and so on. One has to do it mentally and without any use of any device even if just pen and paper to be impressive

  • @praveenrajpuru
    @praveenrajpuru8 жыл бұрын

    how to d codes of other years.please tell me or send me any video to learn that

  • @sunnyhemanth6612
    @sunnyhemanth66128 жыл бұрын

    what's with the codes of other years,.....help me

  • @GFApryl
    @GFApryl5 жыл бұрын

    What is the method to determine the year code? I can do THIS year, but what of other years, like when a person was born?

  • @josefwintzentlibot7852

    @josefwintzentlibot7852

    5 жыл бұрын

    Today in AGT a Malaysian pulled impressively the Calendar Trick. The Calendar Trick is to tell accurately the day of the week any random date presented to. It is actually memory game with a little arithmetic. Just subtract 1900 to the year; add the date; add the number of leap days from 1900 till that date; then add 0 if it falls in a January or October, 1 if May, 2 if August, 3 if February, March or November, 4 if June, 5 if September or December, or 6 if April or July; and finally continuously subtract 7 unto it till the answer is less than 7. When the final answer is 0 it falls on a Sunday, 1 on Monday, 2 on Tuesday, and so on. One has to do it mentally and without any use of any device even if just pen and paper to be impressive

  • @drtroyturner7464
    @drtroyturner74647 жыл бұрын

    The easiest way I know is 1) memorize month values. check 2. plus day . a gimme 3) plus year value. Difficult but I know 1904 is a 6 value and 11 years later is also 6 as is 6 years after that and these serve as landmarks for other years. You can also add a couple of family members birth years and years of graduation as check points. 4) obviously divide by 7 and the remainder determines the day of the week. Tell your audience that you can guess within 3 days until you get very good at it. Then 2, Then spot on.

  • @meghaarya1272
    @meghaarya12728 жыл бұрын

    What are the 'code' numbers for any other year? Is there a pattern to it or memorizing?

  • @josefwintzentlibot7852

    @josefwintzentlibot7852

    5 жыл бұрын

    Today in AGT a Malaysian pulled impressively the Calendar Trick. The Calendar Trick is to tell accurately the day of the week any random date presented to. It is actually memory game with a little arithmetic. Just subtract 1900 to the year; add the date; add the number of leap days from 1900 till that date; then add 0 if it falls in a January or October, 1 if May, 2 if August, 3 if February, March or November, 4 if June, 5 if September or December, or 6 if April or July; and finally continuously subtract 7 unto it till the answer is less than 7. When the final answer is 0 it falls on a Sunday, 1 on Monday, 2 on Tuesday, and so on. One has to do it mentally and without any use of any device even if just pen and paper to be impressive

  • @tobyharnish8952

    @tobyharnish8952

    2 жыл бұрын

    Here are the steps to figuring out the year code for any year: The year code for 2000 is 0 (you have to remember that). Now, to determine any year code within the 2000 range is simple. Let's say that we want to know the year code for 2032 The first step is to add 32 to 0. The next step is to divide 32 by 4 to determine how many special years are within that range. Since 32/4 = 8, we need to add 8 to 32. So 32+8 is 40. The next thing is to subtract a multiple of 7 from 40. The biggest nultiple of 7 that fits into 40 is 35. So 40-35 is 5 (the year code!) Also, every 400 years the calendar repeats. For example, the year code for 2400 is 0. If you want to know the year code for the 1900s, just remember that the year code for 1900 is 1. Similarly, the year code for 1800 is 3, the year code for 1700 is 5, and the year code for 1600 is 0.

  • @SajidAli-cw6gu
    @SajidAli-cw6gu8 жыл бұрын

    what could b code for the remaining years

  • @jesserianbayani3497
    @jesserianbayani34978 жыл бұрын

    how to get the codes for the remaining years?

  • @josefwintzentlibot7852

    @josefwintzentlibot7852

    5 жыл бұрын

    Today in AGT a Malaysian pulled impressively the Calendar Trick. The Calendar Trick is to tell accurately the day of the week any random date presented to. It is actually memory game with a little arithmetic. Just subtract 1900 to the year; add the date; add the number of leap days from 1900 till that date; then add 0 if it falls in a January or October, 1 if May, 2 if August, 3 if February, March or November, 4 if June, 5 if September or December, or 6 if April or July; and finally continuously subtract 7 unto it till the answer is less than 7. When the final answer is 0 it falls on a Sunday, 1 on Monday, 2 on Tuesday, and so on. One has to do it mentally and without any use of any device even if just pen and paper to be impressive

  • @Highlander243

    @Highlander243

    4 жыл бұрын

    What about 13 june 1987.please solve this for me with steps sir.

  • @mr.turdlybird4387

    @mr.turdlybird4387

    4 жыл бұрын

    Add one every year except leap year add two I think

  • @drtroyturner7464

    @drtroyturner7464

    4 жыл бұрын

    @@Highlander243 celestine nag 1987. 12 goes into 87 7 times plus 3 remaining plus 3 for 20th century =13/7 = 1987 doomsday is Saturday which I knew already because I vacationed in Florida that year so easy to remember it as Saturday doomsday. June is 6/6 so the 13th of June was a Saturday as well.

  • @drtroyturner7464

    @drtroyturner7464

    4 жыл бұрын

    You are correct. I don't think this video said how to mathematically find any year code. It just told us that 2015 is 4, 2016 is 5 and 2017 is 6 while 2018 is zero and 2019 is 1, but I can't think of how they mathematically got there. The Doomsday method from other videos succinctly has you dividing last 2 numbers of year by 12 with that number in plus the remainder plus the number of times 4 into remainder and that total divided by 7 tells you the day for that year that days like 10/10 and 12/12 fall so you can then get to 10/31 and 12/25 of that year. There must be a math equation for the year to explain how he could go from a student born in 1998 to a teacher born in 1970 seamlessly. That's the equation that I need as well.

  • @DanTheStripe
    @DanTheStripe7 жыл бұрын

    I did this 3 years ago and forgot how to do it since. I'm re-learning it, and the system used here is the same one I used 3 years ago.

  • @airpotatoes13

    @airpotatoes13

    3 жыл бұрын

    How did you get year codes

  • @GENIUSA1A
    @GENIUSA1A8 жыл бұрын

    Just watched this guy's TedX talk

  • @PuneethSaiBhaskar
    @PuneethSaiBhaskar8 жыл бұрын

    what could be the codes for other years ?

  • @ynnekthennek7009

    @ynnekthennek7009

    8 жыл бұрын

    []

  • @ynnekthennek7009

    @ynnekthennek7009

    8 жыл бұрын

    add these 4 numbers then divide by 7; the year, the year divided by 4, the month code(033614625035), day of the month example: March 3rd, 1948 = 3/3/48 = year =48__ the year divided by 4 = 12__ the month code=march = 3 , day of the month = 3 so 48+12+3+3=66 divided by 7 = 9 remainder 3 and 3 is Wednesday that works perfect for leap years, as long as the date is after feb 29 also, we used march 3rd, but you must subtract 1 if the date is before feb 29th on a leap year. it takes a little getting used to but its really easy once you get the hang of it. remember, leap years start in 2000, just like in 1900, for this century. just get good at the 1900's and you'll understand how the 2000's work a lot easier. you can get really fast in just a week if you work at it an hour a day.

  • @enriquezandreanjohni.4047

    @enriquezandreanjohni.4047

    7 жыл бұрын

    Puneeth Sai Bhaskar Bodasrungi

  • @drtroyturner7464

    @drtroyturner7464

    7 жыл бұрын

    Ynnek Thennek I have Month code memorized and some of the years, like 1904 equals 6 then count up. Do you know how to isolate the division and year value? I find adding a 4th of the year to the year to be a little complicated and a too high number as compared to knowing year value to add. I know 1935 is 2 value as is 1968 however I can't figure out a math problem to tell me this if it slipped my memory. I know 2000 is zero but again have no math to get me that conclusion. please help.

  • @chandanaambati9556

    @chandanaambati9556

    6 жыл бұрын

    where is 1998

  • @drtroyturner7464
    @drtroyturner74644 жыл бұрын

    Honestly, there is this method, there is Doomsday method (I'm leaning towards as possible easiest) and there is Spam School which is easy, but not sure how they arrive at their year codes. I will need to chose 1 and stick with it so my mnemonics don't become intertwined and jumbled. This method is a little scary because you are expected to divide by 4 then add that number to original 2 digit year, then you still have to divide by 7 and your answer is the remainder. That's a little more involved than other methods I'm almost certain.

  • @whatistodaysdate
    @whatistodaysdate7 жыл бұрын

    AMAZING!

  • @ia8492
    @ia84926 жыл бұрын

    Awesome trick...thnxx

  • @krishnamurthythondebavi9525
    @krishnamurthythondebavi95253 жыл бұрын

    How to calculate years codes for 16th,17th,18th,19th & 20th centuries years.

  • @tariqkhokhar1610
    @tariqkhokhar16107 жыл бұрын

    if we have date and month how find year of birth any calculation

  • @josefwintzentlibot7852

    @josefwintzentlibot7852

    5 жыл бұрын

    Today in AGT a Malaysian pulled impressively the Calendar Trick. The Calendar Trick is to tell accurately the day of the week any random date presented to. It is actually memory game with a little arithmetic. Just subtract 1900 to the year; add the date; add the number of leap days from 1900 till that date; then add 0 if it falls in a January or October, 1 if May, 2 if August, 3 if February, March or November, 4 if June, 5 if September or December, or 6 if April or July; and finally continuously subtract 7 unto it till the answer is less than 7. When the final answer is 0 it falls on a Sunday, 1 on Monday, 2 on Tuesday, and so on. One has to do it mentally and without any use of any device even if just pen and paper to be impressive

  • @drtroyturner7464
    @drtroyturner74647 жыл бұрын

    ps. 1955, 1966, 1977 and 1988 are all 6 values. 99 is a 5 whereas 2000 leap year moves ahead one and is a zero (same as 7).

  • @drtroyturner7464

    @drtroyturner7464

    6 жыл бұрын

    ***** Thanks. This page has been needing this. I'm gonna give my audience the choice of 4 ostensibly random spread out dates. 2 will have a zero code and the other 2 will have a code of 5. Most will have no idea and since they freely choose which year (of 4) still imressive.

  • @scaleofc1966
    @scaleofc19667 жыл бұрын

    On different websites I have seen different codes for years and different ways of working out the year. Could anyone give me a link to the list of THIS video's year codes or THIS video's way of working it out. Thanks.

  • @dookdawg214

    @dookdawg214

    6 жыл бұрын

    Every year back is a movement of one. Except you also have to take into account the leap years. So just add them up. For example, if you want to calculate 1982, you add 36 + 9 and get 45. To simplify 45, take out the biggest factor of 7, which is 42, and that gives you 3 movements backwards from this year's day.

  • @drtroyturner7464
    @drtroyturner74646 жыл бұрын

    I have a new method that makes the workload monumentally easier for me (or you) yet to the casual audience is no less spectacular. Patter about how you know the day of any date in history. The sneaky part is you give your volunteer the choices of 1950, 1975, 2000 and 2025 as that is representative of the old past, recent past, present and future. Fact is these dates are dates in which you only have about 2 number values to have to remember.

  • @marksusskind1260
    @marksusskind12608 жыл бұрын

    I used to use that! :-)

  • @coreymcdonald7745
    @coreymcdonald77452 жыл бұрын

    Year codes: 2000 is 0. you can either add 1 for every year, and add 2 for leap years. or you can take the last 2 digits of the year, divide it by 4, then add that answer back to the original number... 2015 for example. 15/4=3.75. Ignore the .75 and add 3+15 to get 18. subtract the largest multiple of 7, without going over. 18-14=4. 2015 has a year code of 4.

  • @coreymcdonald7745

    @coreymcdonald7745

    2 жыл бұрын

    If you want to go into the past or the future, 1900 has a year code of 1, so just add 1 to any year code in the 2000's, 1800 has a year code of 3, and 1700 has a year code of 5. 2100 is the same as 1700, 2200 is the same as 1800, 2300 is the same as 1900, and because the calendar repeats every 400 years, 2400 is the same as 2000, and 1600

  • @stefantomasi4036
    @stefantomasi40365 жыл бұрын

    This video is incredibly awesome. I have the same talent and ability as the guest speaker!! I go back from 1900-2099

  • @examine7304

    @examine7304

    5 жыл бұрын

    so tell me what was the day in 2 feb 2002

  • @stefantomasi4036

    @stefantomasi4036

    5 жыл бұрын

    examine February 2, 2002 was a Saturday!

  • @stefantomasi4036

    @stefantomasi4036

    5 жыл бұрын

    examine I can also tell you another date. October 15, 1966. That day was a Saturday

  • @examine7304

    @examine7304

    5 жыл бұрын

    how you calculate feb 2 2002 tell me

  • @stefantomasi4036

    @stefantomasi4036

    5 жыл бұрын

    examine I can further explain. There’s a 28 year cycle, it’s something that repeats itself every 28 years bc all the leap years. For example, February 2, 2002 was a Saturday in 1974 and it will be the same in 2030.

  • @sharvankumar-wq8ch
    @sharvankumar-wq8ch5 жыл бұрын

    Happy new year

  • @petercollins4125
    @petercollins41257 жыл бұрын

    The faculty member shares my birthday, just different years

  • @ultra_rp9360
    @ultra_rp93603 жыл бұрын

    How to find month code ?

  • @georgiapanagopoulou5227
    @georgiapanagopoulou52274 жыл бұрын

    i found a better way - every year with leap saturday is a key year. count days from a doomsday + years from a key year + leap years since a key year then mod 7 if sunday=1 monday=2 tuesday=3 wednesday=4 thursday=5 friday=6 Saturday = 0 or 7 its real

  • @markbegino7603
    @markbegino76037 жыл бұрын

    thank you sir Arthur Benjamin

  • @jmich7
    @jmich77 жыл бұрын

    Wonderful!!!!

  • @alihan8238

    @alihan8238

    5 жыл бұрын

    very funny

  • @jollynass6143
    @jollynass61437 жыл бұрын

    It's a really cool method, but I think you can just use your phone calander if you have it on you.

  • @gaingamgangmei7887
    @gaingamgangmei78875 жыл бұрын

    Why substrate 21?

  • @curranneely9097
    @curranneely90978 жыл бұрын

    this trick is awesome!

  • @praveenrajpuru

    @praveenrajpuru

    8 жыл бұрын

    hi i think u got the trick to know the codes of month .can u pls tell me d codes

  • @thesgcreator3335
    @thesgcreator33354 жыл бұрын

    What's the code for 2019 , sir ?

  • @drtroyturner7464

    @drtroyturner7464

    4 жыл бұрын

    19 has 1 12 in it plus remainder 7 plus 1 four goes in that so 9/7 means 2019 is a Tuesday. That's using Doomsday dates. I like another method as well where January is 1, February is 3, March is 4, April is 0, May is 2, June is 5, July is 0, August is 3, September is 6, October is 1, November is 4, and December is 6

  • @memes3642
    @memes36423 жыл бұрын

    so what is the year code of 2010 how to understand every year code?

  • @coreymcdonald7745

    @coreymcdonald7745

    2 жыл бұрын

    take the last 2 digits of the year, divide it by 4, ignoring any remainder. and add it back to the original number. subtract the nearest multiple of 7, and that's the year code. 2010/4=2.5 ignore the .5, and add the 2 back onto the 10 to give you 12. Subtract the largest multiple of 7, and your year code is 5.

  • @RohitKumar-ob1gi
    @RohitKumar-ob1gi5 жыл бұрын

    Sir you not tell code of year

  • @grayghost7
    @grayghost711 ай бұрын

    These kids are 19 now

  • @paviswapna530
    @paviswapna5307 жыл бұрын

    what is the codes for other years.. sir...?

  • @josefwintzentlibot7852

    @josefwintzentlibot7852

    5 жыл бұрын

    The said year code is that particular year minus 1900 plus the number of leap days between 1900 and that particular year. In his method you have to add 1, in my method you have to add nothing. But in my method the month codes are 0 for January and October, 1 for May, 2 for August, 3 for February, March and November, 4 for June, 5 for September and December, and 6 for April and July. The month code is the only part to be memorized in my method because the so called year code could be calculated actually. And here is some more, it is not compulsory that 1900 should be the reference year - any year with a New Year's Day on a Monday will do.

  • @drtroyturner7464
    @drtroyturner74644 жыл бұрын

    Basketball. A lady 6 ft 2 beats a lady 5'3 by the score of 2 to nothing thus 622 and 503 are the 1st 6 months. Then a guy 5 ft 4 loses to a guy 6 ft 4 by a score of 1 to 2 thus 514 and 624 for months July to December. So by remembering a couple of common basketball heights and likely outcomes you can name outside numbers followed by filling in the middle numbers to complete each 3 month period. A lot more digestible than trying to straight away remember all 12, 622, 503, 514 624

  • @Johnny.c205
    @Johnny.c205 Жыл бұрын

    I don’t know what to do with the remainder

  • @josesoccer2011
    @josesoccer20118 жыл бұрын

    #1 Why does this video only have 4,876!?!? #2 What are the codes for the rest of the years: 1992, 1993, 1900, 1800, etc..

  • @sirdargurtejsingh9584

    @sirdargurtejsingh9584

    5 жыл бұрын

    @BlackHateMatrix .....This table is not Absolute ......It carry some wrong values .......

  • @sirdargurtejsingh9584

    @sirdargurtejsingh9584

    5 жыл бұрын

    @BlackHateMatrix the code of 1995 should be 1 ......

  • @jaipatel3435
    @jaipatel34356 жыл бұрын

    I saw this guy today!!!

  • @drtroyturner7464
    @drtroyturner74644 жыл бұрын

    Took some doing but I found out how to find year codes from scratch. 2015. Zero in on the last 2 numbers only. 15. Divide by 4 ignore the remainder = 3. Add the result to the original # so 15 +3 =18, Divide by 7 but this time you are only concerned with the remainder as that is your year code. So 18/7 means year code for 2015 is 4. Let's do 2018. 18/4 is 4 which is added to 18 so 22, Divide by 7 and the remainder is code so 1 is the code for 2018. 1 more. 2020. 20/4=5 , 25/7, 4 is the code for 2020. What day is January 6, 2020. Today. But seriously, 6 (for January) plus 6 day plus 4 year code is 16/7 is remainder Tuesday.

  • @coreymcdonald7745

    @coreymcdonald7745

    2 жыл бұрын

    2020 is a leap year. The original commenter's example of January 6, 2020 being a Tuesday is not correct. He did not account for the fact that the year has not "leaped" yet in January, so the month code for January is actually 5, on a leap year. 5+6+4=15, subtract the largest multiple of 7 (14), gives you 1, or Monday.

  • @drtroyturner7464
    @drtroyturner74644 жыл бұрын

    You are correct. I don't think this video said how to mathematically find any year code. It just told us that 2015 is 4, 2016 is 5 and 2017 is 6 while 2018 is zero and 2019 is 1, but I can't think of how they mathematically got there. The Doomsday method from other videos succinctly has you dividing last 2 numbers of year by 12 with that number in plus the remainder plus the number of times 4 into remainder and that total divided by 7 tells you the day for that year that days like 10/10 and 12/12 fall so you can then get to 10/31 and 12/25 of that year. There must be a math equation for the year to explain how he could go from a student born in 1998 to a teacher born in 1970 seamlessly. That's the equation that I need as well.

  • @coreymcdonald7745

    @coreymcdonald7745

    2 жыл бұрын

    You can use 2000 as a basepoint to start the calculation. for years in the 1900's you add 1 to that answer, for years in the 1800's you add 3, and years in the 1700's you add 5. knowing this information, you can calculate any date from 1600 on. don't go below 1600, because this is based on the Gregorian calendar which was invented in the late 1500's.

  • @polygongaming8859

    @polygongaming8859

    Жыл бұрын

    ​​​@@coreymcdonald7745 This is why I prefer the Doomsday Algorithm for finding the day of the week for any date, you can calculate the week days for any date in the Julian Calendar with the Doomsday method. I can calculate from 9999 BC to Infinity (What I mean by Infinity is there's no limit to the number of years in the future that I can calculate).

  • @lazy_man_
    @lazy_man_7 жыл бұрын

    what is the cod for 2001?

  • @tomdonaldson6948

    @tomdonaldson6948

    7 жыл бұрын

    Home Paity 1

  • @aattaatt5323
    @aattaatt53236 жыл бұрын

    how will I get the codes for other years?

  • @aattaatt5323

    @aattaatt5323

    6 жыл бұрын

    I'm 2005

  • @missbansal1465

    @missbansal1465

    5 жыл бұрын

    @@aattaatt5323 will u explain it?

  • @gonetamu6841

    @gonetamu6841

    5 жыл бұрын

    How to get i am 1996

  • @Corazonlatino1995
    @Corazonlatino19953 ай бұрын

    Hi, I'm able to calculate the day of any date too. He is SMARTas a WOLF because he ask before the YEAR of birth(because is the strangest thing to calculate or remember very quickly), and after them will be very easy to say the answer after to know the month & day of birth. I don't memorize the code of every year, but only they of century!!

  • @believeinpractical3930
    @believeinpractical39304 жыл бұрын

    Please give all year code

  • @karimbhaikarim5729
    @karimbhaikarim57297 жыл бұрын

    good

  • @myart4991
    @myart49914 жыл бұрын

    I want to know the remaining year codes

  • @JeffTheHokie

    @JeffTheHokie

    2 жыл бұрын

    1900 was 1. 2000 was 0. Add 1 for every ordinary year, and 2 for every leap year. Then subtract any multiples of 7. Start with the base year for the century, add the 2-digit year number, add the number of leaps (divide the 2-digit year number by 4 and throw out the remainder), then divide by 7 and keep only the remainder (or just subtract multiples of 7) For example 1955 = 1 (for 1900)+55 (for the years) +12 leaps(55/4 = 12 +remainder) 1+55+12 = 68 which simplifies to 5 This video was likely shortened. It looks like they cut out the part where he explained the year code.

  • @jhallooinn5371
    @jhallooinn53716 жыл бұрын

    From where did that 21 number come to be subtracted ..

  • @Matthias27182

    @Matthias27182

    5 жыл бұрын

    jhalloo inn 21 is the largest multiple of 7, therefore it is subtracted. If the number was 22, the largest number would still be 21, so the final number would be 1

  • @drtroyturner7464

    @drtroyturner7464

    4 жыл бұрын

    The 21 came from adding the Month code which was 622 503 514 624 for months January through December plus persons chosen day plus year code of 4 for 2015 gives us a total of 21 because November is 2 plus 15 (girls birthday) plus 4 is 21. Divide by 7 but concentrate on the remainder. Remainder zero is zero day Sunday.

  • @natrajlaxmi2878
    @natrajlaxmi28784 жыл бұрын

    I want to know the year codes

  • @natrajlaxmi2878

    @natrajlaxmi2878

    4 жыл бұрын

    How to find year code?

  • @albodios3868
    @albodios38687 жыл бұрын

    The day when you publish your video is Wednesday. 2016 is a leap year 1+3+6-7=3 and 3 is Wednesday

  • @FarooqAhmed-lm4uf
    @FarooqAhmed-lm4uf6 жыл бұрын

    Sir I can calculate any day of year by heart repeat by heart upto remarkable range 100000000000 years or more with in one second!

  • @aaaa-bd4dd

    @aaaa-bd4dd

    6 жыл бұрын

    how guide me

  • @shovapoudel4430

    @shovapoudel4430

    4 жыл бұрын

    Me too

  • @tobyharnish8952

    @tobyharnish8952

    2 жыл бұрын

    Hey Master, Can you tell me the day of the week for 4122 January 12? Also, if you don't mind, write down the steps out so that I can learn it also.

  • @jgr2045

    @jgr2045

    7 ай бұрын

    I get Monday. 4 for the century, 6 for the year (also equivalent to -1), 1 for January, and 12 is equivalent to -2. In this case the -1 and 1 cancel each other out which leaves 4-2=2, Monday. Now, before anyone argues I'm using a system Arthur Benjamin himself taught back in the 1980's and 1990's which revolves around the 1900's having a century code of 0, and that's the system I've gotten used to using.

  • @saritasoniandpriyanshasari9631
    @saritasoniandpriyanshasari96315 жыл бұрын

    My brithbay 21 Februar

  • @dumguyawesome
    @dumguyawesome4 жыл бұрын

    Ok here's some code 2000=0 or 7 2001=1 2014=3 and 2009= 4 I don't wanna write then all to lazy

  • @shovapoudel4430

    @shovapoudel4430

    4 жыл бұрын

    how

  • @williamwordsworth7823
    @williamwordsworth78233 жыл бұрын

    How to remember year codes

  • @mydogskips2
    @mydogskips25 жыл бұрын

    Let's be honest though, we all still consult a calendar, just to be sure. At least I know I do when I have the chance, which is pretty much all the time.

  • @jeffw1267

    @jeffw1267

    2 жыл бұрын

    Or you can use two different methods to calculate the answer, like I do, then compare the answers for accuracy. It does take longer though.

  • @aashiangel2558
    @aashiangel25588 жыл бұрын

    how for 2015 u have added 4

  • @chandpasha4805

    @chandpasha4805

    7 жыл бұрын

    Aashi angel have u got answer

  • @soulvoices1627
    @soulvoices16274 жыл бұрын

    Not true i was born 8/26 that would put ne at a Monday &i wasnt born in a Monday

  • @albodios3868
    @albodios38687 жыл бұрын

    2010 - 5 2011 - 6 2012 - 1 2013 - 2 2014 - 3 2015 - 4 2016 - 6 2017 - 0 2018 - 1 2019 - 2 2020 - 4

  • @kpparadise4933

    @kpparadise4933

    5 жыл бұрын

    How to find out this code,please explain

  • @arver23

    @arver23

    5 жыл бұрын

    @@kpparadise4933 ( Last two digit of year + (Last two digit of year / 4) ) mod 7 so for example: 2018: 18+4=22 and (22)mod 7 is 1

  • @netravathihv5134

    @netravathihv5134

    5 жыл бұрын

    What in mod 7 please explain

  • @mydogskips2

    @mydogskips2

    5 жыл бұрын

    @@netravathihv5134 It is the remainder of a number divided by 7. A modulus, or answer of a problem modulo 7 (mod 7) is equal to the remainder of the number divided by 7. Using the example Marton gave above, let's try 22. 22 mod 7 = 1, because 22/7 has a remainder of 1. 22/7 = 3 remainder 1. 23 mod 7 is 2 because 22/7 has a remainder of 2; 23/7 = 3 remainder 2. 24 mod 7 is 3 because 24/7 has a remainder of 3... 25 mod 7 is 4 ... 26 mod 7 is 5 ... 27 mod 7 is 6 ... However, 28 mod 7 is 0 because 28/7 has a remainder of 0. 28/7 = 4 remainder 0. 21 mod 7 is also 0 because 21/7 has a remainder of 0. 17 mod 7 is 3 because it is the remainder of 17/7. 18 mod 7 is 4... 19 mod 7 is 5... I want to point out that these numbers are NOT the same as the numbers in the list/table provided above because the numbers provided in the list at values for the (last two digits of year + year/4) modulo 7, they are NOT equal to the year modulo 7. What I did above is simply explain to you what modulo 7 is. I don't know, it's not too difficult to understand, but somewhat difficult to explain I guess.

  • @chandpasha4805
    @chandpasha48057 жыл бұрын

    for leap year don't add 2

  • @chandpasha4805

    @chandpasha4805

    7 жыл бұрын

    because before feb 29 add only 1

  • @Kristiansolis15
    @Kristiansolis152 жыл бұрын

    One day we will make all days FRUNDAY it’s Friday and Sunday combined

  • @jadacrawfish8727
    @jadacrawfish87274 жыл бұрын

    Today is 2(10)=20. Otherwise known as 2/10/20 Thats my math trick 4 ya

  • @lukeroberts1630
    @lukeroberts16307 ай бұрын

    I can do this already

  • @tristanr1349
    @tristanr13497 жыл бұрын

    It's not working for me

  • @josefwintzentlibot7852

    @josefwintzentlibot7852

    5 жыл бұрын

    @BlackHateMatrix, for Aug 17 2016, 2016 - 1900 = 116 116 + 25 + 4 = 145 (25 number of leap days from Jan 1 1900 to Dec 31 2000, 4 number of leap days to Aug 17 2016) 145 + 2 = 147 (2 the month code for August) 147 + 17 = 164 164 - 140 = 24 24 - 21 = 3 Aug 17 2016 is a Wednesday!

  • @tdho
    @tdho8 жыл бұрын

    what happened with that censored boy? why he is the only one got censored on his face?

  • @isabelvega1679

    @isabelvega1679

    8 жыл бұрын

    +Alexandria Pearson omg lexieeeeee

  • @nerdnation1076

    @nerdnation1076

    8 жыл бұрын

    They do that when the kid or parents don't want there child seen on public media

  • @MCGhostnutPlayz
    @MCGhostnutPlayz8 жыл бұрын

    1999-5 2000-0 2001-1 2002-2 2003-3 2004-5 2005-6 2006-0 2007-1 2008-3 2009-4 2010-5 2011-6

  • @maryvarghese1088

    @maryvarghese1088

    8 жыл бұрын

    codes for 2012 2013 2014 2016 ..plz

  • @mmjgaming7607

    @mmjgaming7607

    8 жыл бұрын

    +Mary Varghese 2012:1 2013:2 2014:3 2016:6

  • @zeusgaminghd3790

    @zeusgaminghd3790

    8 жыл бұрын

    May I ask how you got those numbers please ? Not google, but with math..

  • @mmjgaming7607

    @mmjgaming7607

    8 жыл бұрын

    +Zeus GamingHD sure, I found out what March (5) second (2) and 1985 for example, then once I found out it was a Saturday I figure out how much I have to add to 7 (5+2) which gives me 6. Make sense?

  • @jeevanjyotinamdev

    @jeevanjyotinamdev

    7 жыл бұрын

    How you have calculated these give formula..????????????

  • @leir9810
    @leir98105 жыл бұрын

    it doesnt work for ANY date for example it doesnt working for 16,17,18th century

  • @mydogskips2

    @mydogskips2

    4 жыл бұрын

    I should work for any date in the Gregorian calendar, after the adjustment was made, I think that was in like 1752 or something like that. You have to make slight adjustments to the equation used to calculate the day, but it should work. I have actually done it myself to figure the birthday of certain famous historical figures and verified it to be true.

  • @rajaabduljalil9117
    @rajaabduljalil91173 жыл бұрын

    what will be da day on 5 FEBRUARY 1944

  • @cortneymaitland4429
    @cortneymaitland44295 жыл бұрын

    John Conway has a better algorithm.

  • @mydogskips2

    @mydogskips2

    5 жыл бұрын

    I just came from that video, and I disagree. To me this is a much simpler and more intuitive formula, it also doesn't require one to deduce from the "doomsdays". It calculates the actual answer, not a relative answer to extrapolate from. But to each their own, I guess. However, I did learn an interesting fact about "doomsdays," how 4/4, 6/6, 8/8, 10/10 and 12/12, not to mention some of the other months' dates are all the same day of the week, that was really interesting. And by the way, in my opinion, this video wasn't very good, I could explain it a lot better and easier than this guy did. First off, 0336 146 25035, those are the month codes from January to December, much easier to remember than those he presented. The only issue is that you have to subtract 1 at the end fo your calculation to adjust for 21st century(2000s) dates as the values I gave above are for the 20th century(1900s). And the formula which he doesn't state is, Calendar Formula : Day of the week = (Year + Year/4(drop remainder) + Month's value + Day) modulo 7, the remainder corresponds to the day. That's the year + year/4 + month's value + day. Total modulo 7. This means you can cast out 7s along the way, it's really a lot easier if you ask me. Much better than remembering century codes, dividing by 12, holding the remainder, dividing by 4 and summing just to find the doomsday, after which you still have to extrapolate to find the weekday. I have posted a few other comments explaining in detail how to do it, use this "calendar formula," so if you're interested... well, you know.

  • @65inchtrucker14

    @65inchtrucker14

    5 жыл бұрын

    Doomsday is simpler and faster much easier to mentally calculate I can do it in less than 5 seconds. Doomsday is also better because smaller numbers are used and is much easier once you know the shortcuts.

  • @mydogskips2

    @mydogskips2

    5 жыл бұрын

    @@65inchtrucker14 Agree to disagree. And I'd love to see you do it in 5 seconds because I know I couldn't myself.

  • @anklebrka
    @anklebrka6 жыл бұрын

    Don't give me fish. Teach me how to fish. How do you figure out the year code?

  • @josefwintzentlibot7852

    @josefwintzentlibot7852

    5 жыл бұрын

    Today in AGT a Malaysian pulled impressively the Calendar Trick. The Calendar Trick is to tell accurately the day of the week any random date presented to. It is actually memory game with a little arithmetic. Just subtract 1900 to the year; add the date; add the number of leap days from 1900 till that date; then add 0 if it falls in a January or October, 1 if May, 2 if August, 3 if February, March or November, 4 if June, 5 if September or December, or 6 if April or July; and finally continuously subtract 7 unto it till the answer is less than 7. When the final answer is 0 it falls on a Sunday, 1 on Monday, 2 on Tuesday, and so on. One has to do it mentally and without any use of any device even if just pen and paper to be impressive

  • @deanmetcalfe1174

    @deanmetcalfe1174

    4 жыл бұрын

    In case you can't remember what year it is now just add your year of birth to your age.

  • @robertseiminlen702
    @robertseiminlen7023 жыл бұрын

    Your tricks wont work for 5 feb 2008

  • @ravisurya9073
    @ravisurya90735 жыл бұрын

    This is not good response

  • @michellewilliams9590
    @michellewilliams95905 жыл бұрын

    Doesn't work

  • @subhraranjanbhol4766
    @subhraranjanbhol47668 жыл бұрын

    how to calculate day on 21 june 1995

  • @arindamkumardas8322

    @arindamkumardas8322

    7 жыл бұрын

    its wed bro...:-)

  • @rameshkandregula3427

    @rameshkandregula3427

    5 жыл бұрын

    BlackHateBayer How the year code is zero

  • @stefantomasi4036

    @stefantomasi4036

    5 жыл бұрын

    Wednesday

  • @ipqp23
    @ipqp23 Жыл бұрын

    How about 255 136 140 255 JFM AMJ JAS OND 2014=0 2015=1 2016=2 and 3 Use 2 from jan 1 to feb 29, 2016 Use 3 from mar 1 to dec 31, 2016 1234567 MTWTFSS OCT 23 2016 2 + 23 + 3 = 28 28-7-7-7-7=0 sunday

  • @raushanbist8060
    @raushanbist80607 жыл бұрын

    Sir kripya ise hindi mein bataye hum logo ka bhi bhala ho

  • @lukeroberts1630
    @lukeroberts16307 ай бұрын

    I have a different way of doing this

  • @kamleshrawal5826
    @kamleshrawal58265 жыл бұрын

    Now tell my 11 July 2005

  • @mydogskips2

    @mydogskips2

    5 жыл бұрын

    Monday. 11 July 2005 was a Monday. The formula is: Day of the week = (Year/4 + Year + Month's value + Day) Modulo 7. The remainder corresponds to the day. For 11 July 2005, Year is 05 Year/4 is 05/4 Month's value is 6 (the list follows below) Day is 11 There are 5 steps to solve the equation and find the day of the week for any particular day. Step 1. Take year and divide by 4, drop the remainder (That's Year/4) Step 2. Add the answer(of year/4) back to the year. Step 3. Add the value for the month(which is given in a list/table below) Step 4. Add the number of the day Step 5. Take the total of the summation and find the number modulo 7(you can basically cast out 7s, or just divide by 7 and find the remainder) the remainder will correspond to the day of the week. So for 11 July 2005... Step 1. You take 05, that's the year(you can drop the first two number from 2005) and divide by 4. 05/4 is 1 with a remainder of 1, but here just drop the remainder. The "answer" for step one is 1, 5/4 = 1. Step 2. Next we take the answer from step one (Year/4, drop the remainder) and add it back to the year, 05. So now we have, 05/4(year/4) + 05(year) which is 1 + 5 = 6. Next we have to add the value for the month. In this case it's July, so the value is 6. The month has the values 0336 146 25035 for each month from January to December. That is: Jan-0, Feb-3, Mar-3, Apr-6, May-1, Jun-4, Jul-6, etc... So now we have 6 + 6 = 12 Lastly we need to add the day, in this case, 11. So now, 12 + 11 = 23. Now we take the total 23 and divide by 7 which is 3 remainder 2. (23/7 = 3 r.2) Here the remainder, 2, corresponds to the weekday, Tuesday. HOWEVER, these values are for the 20th century(that's the 1900s), for dates in the 21st century(2000s) you have to adjust by subtracting ONE from the total. So the remainder is still 2, but we have to subtract 1 to adjust, and we get, 2 -1 = 1. So now we know that 11 July 2005 was a Monday.

  • @danalianne2874
    @danalianne28744 жыл бұрын

    except the 1st day of the week is sunday 🙄 math is sorcery i swear you can use math to manipulate.

  • @vaughnvengeance2318
    @vaughnvengeance23188 жыл бұрын

    Whut what school is this?!

  • @mmjgaming7607

    @mmjgaming7607

    8 жыл бұрын

    Brunswick junior high school.

  • @bmocktadir
    @bmocktadir3 жыл бұрын

    After throwing away so much of my time on scam sites, I wanna save your time and energy and because the only website that worked is GameCrook.

  • @cynthianorton4360
    @cynthianorton43603 жыл бұрын

    Catch🤪

  • @akshaybatule6026
    @akshaybatule60267 жыл бұрын

    i want codes for 2000 to 2018....

  • @tomdonaldson6948

    @tomdonaldson6948

    7 жыл бұрын

    1999- 5 2000-0 2001-1 2002-2 2003-3 2004-5 2005-6 2006-7 2007-1 2008-3 2009-4 2010-5 2011-6 2012-1 2013-2 2014-3 2015-4 2016-6 2017-0 2018 -1 Use your manners next time, don't say just say "I want"

  • @stamatios_sterg99
    @stamatios_sterg994 жыл бұрын

    21/11/2019 21+1+1+19+4=46->4=Thursday 09/09/1999 (the day i was born) 9+3+2+99+24=137->4=Thursday

  • @kingkirby8960
    @kingkirby89608 жыл бұрын

    Math can be...fun? Cool. :)

  • @06k.initha91
    @06k.initha914 жыл бұрын

    I want willamshakes birthday day plzz give me

  • @ghulammehmood2521
    @ghulammehmood25217 жыл бұрын

    Reply to me for my work. Thanks.

Келесі