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27
Fun Holiday – e-Day

e-Day celebrates the mathematical constant e, which has a value of 2.7182818. It is celebrated on February 7 in countries that follow the month/day (m/d) date format. This is because the first two digits of the date - 2/7 - correspond to the first two digits of the constant.

Euler's number is commonly celebrated on February 7.
Euler's number is commonly celebrated on February 7.
©iStockphoto.com/drxy

People living in countries that follow the day/month (d/m) format celebrate it on January 27. The first thee digits of this date - 27/1 - match up with the first three digits of e (2.71).

Euler’s Number

Also known Euler’s number, after the Swiss mathematician Leonhard Euler, e is an irrational number that represents the idea that all continually growing systems are a scaled version of a common rate. It is mostly used in logarithms, exponential growth, and complex numbers. It is one of the most important numbers in mathematics, including 0, 1 and pi (π).

e is also sometimes called the Napier's Constant and is often incorrectly referred to Euler's Constant. Euler's Constant is denoted by lower case gamma (γ) and has a value of 0.57721.

Other e Days

Many European countries celebrate Euro Day, sometimes also called e Day. The day is observed on January 1 and celebrates the anniversary of the adoption of the Euro, Europe's common currency in 2002. In New Zealand, eDay is a day where people can get rid of e-waste or old electronics such as computers and old appliances, so they can be recycled rather than being placed in a landfill. Engineer’s Day is observed in Paducah, Kentucky on February 21 where many people participate in an egg drop contest, create edible cars and tape people to walls.

Other Mathematical Holidays

The year is full of mathematical and scientific holidays. Some of these include: Yellow Pig Day, Mole Day, Fibonacci Day, Palindrome Day and Pi-Day. Use our Date Pattern Calculator to find out other interesting calendar dates during the year.

How to Celebrate?

  • Celebrate this fun mathematical holiday by learning more about Euler's number and its importance in mathematics and science.
  • Eat foods that begin with e - make eggs, eggplant or eclairs. Make eggnog as a before dinner refreshment or eggs benedict for breakfast.

Did you Know...

...that there is an Island in Northern Scotland called Eday?

e-Day Observances

Fun Holiday: e-Day Observances
YearWeekdayDateName
2015TueJan 27e-Day
2015SatFeb 7e-Day
2016WedJan 27e-Day
2016SunFeb 7e-Day
2017FriJan 27e-Day
2017TueFeb 7e-Day
2018SatJan 27e-Day
2018WedFeb 7e-Day
2019SunJan 27e-Day
2019ThuFeb 7e-Day
2020MonJan 27e-Day
2020FriFeb 7e-Day
2021WedJan 27e-Day
2021SunFeb 7e-Day
2022ThuJan 27e-Day
2022MonFeb 7e-Day
2023FriJan 27e-Day
2023TueFeb 7e-Day
2024SatJan 27e-Day
2024WedFeb 7e-Day

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