Our result was 5, so Einstein was born on a Friday. Match the resulting number in the list below, and you’ll have the day of the week: Date Number: 14 (the 14th of the month).
WHATS THE WEEK NUMBER MOD
Calculating the Dayīack to the original formula: (Year Code + Month Code + Century Code + Date Number - Leap Year Code) mod 7 If you can divide a Julian year by 4, it’s a leap year.Įinstein’s birthday was in 1879 which was not a leap year (0), so it doesn’t affect the outcome.
If you can divide a Gregorian year by 4, it’s a leap year, unless it’s divisible by 100. EDIT: If the date is in a January or February of a leap year, you have to subtract one from your total before the final step. The other thing to take into account is whether you are dealing with a leap year. The Century Code is 2.įor Einsteins birthday in 1879, the Century Code is 2, because it’s a Gregorian date, and the chart above shows that dates in the 1800s get an adjustment of 2. The Century Code is 3.Įxample 2: if the year is 1625 CE, calculate 1625 divided by 100, which gives you 16.25. (18 - (YYYY div 100)) mod 7Įxample 1: if the year is 852 CE, calculate 825 divided by 100, which gives you 8.25.
WHATS THE WEEK NUMBER FULL
If you are looking at a Julian date, the formula is to divide the full year by 100 and round down. If you are only doing this calendar trick with friends’ birthdays, you could probably leave this step out, because dates that fall in the 1900s get a Century Code of zero and don’t affect the outcome of the calculation. Gregorian Datesįor the Gregorian Calendar, remember the number 4206420: The Gregorian Calendar began on 14 September 1752, skipping 11 days. In Great Britain, and what was to become the USA, the calendar system changed from the Julian Calendar to the Gregorian Calendar on 2 September 1752. You then need to apply an adjustment based on the century. That would link the month of October with the number zero. For example, Halloween is in October, so to remember that October has a Month Code of zero (represented by an image of a ball), you could picture a group of people in Halloween costumes doing something with a ball. If you are having trouble associating the images with the months, pick an aspect of each month to associate the image with. If the number six is represented by the image of an elephant, picture an elephant in April and July, and so on. You could picture a butterfly in February and March, if you use a butterfly image for the number three. For example, you could picture a game of soccer (football) in January, with ball being a mnemonic image for zero. I use my Ben System images: Samwise (033) throws a glass of beer (614) on George Boole (625) who falls backwards on Sally (035).Ī way to quickly memorize 033614625035 without a complex mnemonic system would be to use a number shape system to associate images with each month.
WHATS THE WEEK NUMBER HOW TO
If you don’t know how to memorize a number like 033614625035, you could either use repetition or learn a mnemonic system like the Major System or Dominic System. For Einsteins birthday in March, it is 3. If you know how to memorize numbers you can quickly memorize the number 033614625035: You could use a number shape image like a ball or egg to hold that in memory while you calculate the items below (because 0 looks like a ball or an egg, making it easy to remember that digit). 98 / 7 = 14, and the remainder is 0, so 0 is our Year Code for 1879. ” Mod” means divide the number and keep only the remainder.
Then add 19 back into the YY number, which is 79 in this case, resulting in 98. For the year 1879, it’s 79.įirst, divide YY by 4 and discard the remainder: 79 div 4 = 19. To calculate the Year Code, use this formula: (YY + (YY div 4)) mod 7 I’ll run through an example with the date, 14 March 1879 - Einstein’s birthday. The formula is: (Year Code + Month Code + Century Code + Date Number - Leap Year Code) mod 7 It allows you to take a date, like 14 March 1879, and mentally calculate which day of the week it fell on.įirst, we’ll show you how to do the technique from scratch, and then we’ll give you an interactive date calculator that you can use to check every step of the algorithm. Here is a calendar calculation technique that I learned from a book called Mind Performance Hacks.
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