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3118 Calendars:

Thirty days hath September,
April, June, and November.
All the rest have thirty-one,
Excepting February alone,
And that has twenty-eight days clear,
And twenty-nine in each leap year.
For other versions and the "knuckles" method for remembering month lengths, visit this Wikipedia article.
Instructions | Example: November 12, 2070 |
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Step 1: Determine the code for the century:
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Century = 2000's The code for 2000's is 6 Shortcut: Use -1 instead of 6 for 2000's to make the arithmetic easier. Total = 6 |
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Step 2: Determine the code for the year:
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Year = 70 68 is 2, so 69 is 3 and 70 is 4! Total = 10 (6 + 4) |
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Step 3: Determine month code:
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Month = November November = 2 Total = 12 (6 + 4 + 2) |
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Step 4: Determine date code:
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Date = 12 The code for date:12 is 5. Total = 17(6 + 4 + 2 + 5) Shortcut #1: Subtract 7, 14, 21 or 28, from the date to find code, dates less than 7 are already equal to the code. Example: Nov 12: 12 - 7 = 5. Example: Nov 26: 26 - 21 = 5 Shortcut #2: Simply add the date to the total. Example: Nov 12: Code=12, Total = 24 (6 + 4 + 2 + 12). |
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Step 5: Determine day-of-week from total Divide the total from Step 3 by seven, the remainder giving the day-of-week:
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Total = 17 (Century=6, Year=4, Month=2, Date=5) 17 divided by 7 is: 2 remainder 3 3 = Wednesday Shortcut: Instead of dividing, just subtract 7, 14, 21, 28, or 35, etc. (multiples of 7) until you have a number 0 to 6. For example, 17 - 14 = 3. If the total was 30, then 30 - 28 = 2 = Tuesday. More Flashcards |
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Step 6: Don't forget leap-year! Subtract 1 at any point in the process only if the year is a leap year, and the month is January or February! |
2070 is not a leap year. Shortcut #1: The year is a leap year if it is found in the table in step 1. (68 and 72 are leap years, but 70 is not) Shortcut #2: A year is a leap year if it is evenly divisible by 4. Shortcut #3: As a last step, you can simply take the day before (if the year is a leap year, and the month is Jan. or Feb.) Click here for the rare exceptions to the above shortcuts. |
Click here for flashcards for 1800 to 2199.
Tips and Tricks
• Some may find it easier to combine the century and year code first, then combine the month and date code, and then add the 2 numbers together for a final total, and proceed to step 5 from there.
• Click here for a printable one-page quick reference.
• Please let us know your success stories if you master this system!
Links
• Calendar Memory Records
• Doomsday Algorithm - Gaudy yet informative site showing a different approach to the human calendar, originally created by mathematician-great John Horton Conway
New 100-Year Perpetual Calendar! Click Here!
Download a printable copy of the 10,000-Year Calendar in the format that you prefer:
tyc.xls
(Microsoft Excel Version)
tyc.wk4
(Lotus 1-2-3 Version)
tyc.pdf
(Adobe Acrobat Version)
vecny_kalendar.pdf
(Czech language)
(Make your left and right margins 0 (zero) inches!!!)
Spreadsheet and Adobe Acrobat versions converted by amateur genealogist John A. Blair.
Czech language version translated by kalendar.beda.cz.
More Charts
Use Up/Down scroll buttons to specify the 100-year span of the calendar, and then print! You will easily be able to view the monthly calendar for any year & month for 100 years - without a computer! |
Textual Link | |
<a href="https://www.CalendarHome.com"> CalendarHome.com </a> - The NEW homepage for everything calendar! <br> |
Monday's child is fair of face,
Tuesday's child is full of grace,
Wednesday's child is full of woe,
Thursday's child has far to go,
Friday's child is loving and giving,
Saturday's child works hard for its living,
But the child that's born on the Sabbath day
Is bonny and blithe, and good and gay.
Have you ever heard of people who can calculate the day-of-week for any date in their head? How do they do it? Here we explain how anyone can be a human calendar! The basic concept is to add together 3 one-digit numbers, one for year, one for month, and one for date. Then divide the total by seven, the remainder giving a number 0 through 6 that represents Sunday through Saturday. Throw in some shortcuts, and flashcards to memorize the codes, and now anyone can look like a genius!
To start out simple, here are the directions for any date in the 1900's:
Instructions (for 1900's) |
Example: November 12, 1970 |
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Step 1: Determine the code for the year:
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Year = 70 (19)68 is 2, so 69 is 3 and 70 is 4! Total = 4 |
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Step 2: Determine month code:
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Month = November November = 2 Total = 6 (4 + 2) |
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Step 3: Determine date code:
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Date = 12 12 = 5 Total = 11 (4 + 2 + 5) Shortcut #1: Subtract 7, 14, 21 or 28, from the date to find code, dates less than 7 are already equal to the code. Example: Nov 12: 12 - 7 = 5. Example: Nov 26: 26 - 21 = 5 Shortcut #2: Simply add the date to the total. Example: Nov 12: Code=12, Total = 18 (4 + 2 + 12). |
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Step 4: Determine day-of-week from total Divide the total from Step 3 by seven, the remainder giving the day-of-week:
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Total = 11 (Year=4, Month=2, Date=5) 11 divided by 7 is: 1 remainder 4 4 = Thursday Shortcut: Instead of dividing, just subtract 7, 14, 21, 28, or 35, etc. (multiples of 7) until you have a number 0 to 6. For example, 11 - 7 = 4. If the total was 30, then 30 - 28 = 2 = Tuesday. More Flashcards |
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Step 5: Don't forget leap-year! Subtract 1 at any point in the process only if the year is a leap year, and the month is January or February! |
1970 is not a leap year. Shortcut #1: The year is a leap year if it is found in the table in step 1. (68 and 72 are leap years, but 70 is not) Shortcut #2: A year is a leap year if it is evenly divisible by 4. Click here for the rare exceptions to the above shortcuts. |
There you have it! Actually it may take alot of practice before you become proficient, but don't give up! Almost anyone can be a human calendar! Click here for the flashcards to practice the whole process for the 1900's.
Okay, so you have mastered calculating the day-of-week for any date in your head, but only for the 1900's? Click here to show the process when the date is anywhere between 1800 and 2199.
Adapted from Formilab's Calendar Converter.
For information regarding any of the above calendars, please click on the link above.
This utility was created in response to the need to find years that have the same day-of-week to date relationship as a given year. Indicate a year below, and a list of years that have the same days of week for each date will be given. This has been used to set the date on a VCR that doesn't allow years after 2000.
- Day of Week Calculator
- It used to be that finding the day of week for an old date was complicated and time-consuming, but not now! We take into account many historical complications.
- Number of days between two dates
- Calculate the number of days between any two dates. Also shows total hours, minutes, and seconds. Now includes several additional methods of day counting including 30/360.
- Add or subtract years, months, and days from a date
- This one is good for researching old gravestones that sometimes say something like "Lived 38 years, 2 months, and 5 days". This calculator will allow you to determine the date of birth.
- Add or subtract a number of days from a date
- Yep, we do that too!
- Like Years or What years does date land on a ____?
- Does your birthday land on a Thursday this year? Ever wonder when it will land on a Thursday again?
- Convert a Date
- Convert dates to and from many different calendars systems including Gregorian, Julian, Julian Day, Hebrew, Islamic, Persian, Kurdish, Afghan, Mayan, Bahá'í, Indian, French Republican, and more.
![]() Photo Calendar Get out the nice paper for these photo calendars! Monthly and yearly calendars available! Use your own photos or our selection of 100's! |
Calendar Maker A variety of different types of calendars you can print for free: yearly, monthly, portrait and landscape styles. Optional features include languages, month order, your own events, and more. |
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![]() Any Year Calendars This calendar never expires because it doesn't list any holidays or days of the week. Good for recording daily temps, other vitals, birthdays, etc. Remember your anniversary this year and you won't have to sleep on the couch! |
![]() Web Calendar Need a way to keep track of events and be able to log in and change them at any time? How about a free calendar page (with your public-listed events) that you can put on your website, or print and hand out? |
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![]() 10,000-Year Perpetual Calendar If you would like to be able to find the day-of-week for any date, while not on the internet, this is for you! Line up the first 2 digits and seconds 2 digits of the year, and line up month and date. Find the day-of-week thru the year 10000. |
![]() 100-Year Perpetual For years 1900 to 2005. Print this out and quickly find out what day of the week you were born (unless you were born before 1900!) |
![]() ![]() Choose portrait or landscape style, photo border, text under photo, and more! ![]() ![]() ![]() ![]() ![]() |
The Poem: A WEEK OF BIRTHDAYS:Monday's child is fair of face,Tuesday's child is full of grace, Wednesday's child is full of woe, Thursday's child has far to go, Friday's child is loving and giving, Saturday's child works hard for its living, But the child that's born on the Sabbath day Is bonny and blithe, and good and gay. The Month Poem:Thirty days hath September,April, June, and November; February has twenty-eight alone, All the rest have thirty-one, Excepting leap-year, that's the time When February's days are twenty-nine. |
![]() A real 10,000-Year Clock! at The Long Now Foundation |
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Calendar Search! |
It's easy to put a calendar search on your page! Click here for the html to insert into the html for your site. Click Here for the code for this banner. |
Today's Date! |
Click here to put Today's Date on your page! Your site always looks current! Customizable for your time zone. |
Awards we have won!
CalendarHome.com is proud to have been named
the Official Calendar to the year 2000
and the New Millennium!
Thank you to all of you who have bestowed upon us awards, those who have had kind words, and to everyone who visits our site. :-)
- Justin White, Webmaster
Comments
We found a picture of my parents. We did not know what year it was taken. In the picture there was a calendar with February 8, Tuesday. We went searching the net, found your site and it gave us the answer we needed. So now that we found you, we are marking it as one of our favorite sites to visit when we need it. You don't know how thankful we are that we were able to find the year on this picture. Again THANK YOU!!!!!!- Nancy L. Barrow
I love this site!! I was looking for a calendar and I really found one this time!! It is wonderful--I have it bookmarked for future use. Great job--this is just what we needed on the Net!!
- Michelle Wright of Digitel.Net-Webpage Design
I wanted to know what day 6/6/44 was to include in a news story for my American Legion newsletter. And subsequently, I used your calculator to determine how long our county's last survivng WWI veteran lived in the number of days. Also the 'day' he was born and the 'day' he was married, finding this information using your calendar. This is a most interesting - and informative - site. I've passed it along to others whom I feel would have good use for its information. Thanks for creating it and putting it on the web.
- Wally Ahlborn
Congratulations!!......Your site definitely qualifies for the "Critical Mass Award". A very nice site, excellent design, clever original graphics, and your content is informative, entertaining, presented well and easy to access.
- Bill Darling
Wonderful! Just what I've been looking for (all over)! Thanks!!!
- Ellen Speyer
I do the employee schedule at work and was wanting the 1999 holidays--how great to be able to access them so easily!!
- Sandra Thrasher
This is just about the coolest thing I've ever seen on the web. I'm a novelist, writing a book set in the 1600s, and your calendar calculator page was very helpful. Thanks.
- Mary Thompson
Your page is great. I am working on my families genealogy and have found your sight to be helpful in so many ways. Thank You, keep up the good work!
- Lori Halliday
Justin White was always interested in calendars and in 1997 created a calendar site called "The 10,000-Year Calendar" at a free homepage site. In November of that same year he registered the domain name CalendarHome.com as a birthday present to himself. It was billed as "The homepage for everything calendar" and had a calendar links section, a calendar store, and the original "10,000-Year Calendar".
The site has evolved a lot since then. You can now print a calendar with a photo, choose multiple languages and configurations, and include your own events. We have printable perpetual calendar charts. We provide a free calculator to determine the number of days between two dates (using multiple methods), a utility that instantly converts to and from 15 different ethnic and computer calendar systems. We invented the best day-of-week calculator on the Internet in that it will instantly tell you the day of week for many countries and places simultaneously, taking into account numerous complications (primarily because of different times of conversion from Julian to Gregorian and different dates that were considered first day of the year). We created our own system of mental calculation of the day of week for a given date. We have also associated with localendar.com to provide one of the best web calendars on the Internet.
We have also created many features based on user feedback, such as the 30/360 day counting method, the 200-Year Excel perpetual calendar poster, and several personalized printable tearaway countdown calendars. CalendarHome.com has been listed in several books and newspaper articles. Thank you very much to our users who have helped make us great!
Here's what the last month looked like at CalendarHome.com:
Obviously people are here while at work - you could do worse things on the clock: