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Feb7 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.


People living in countries that follow the day/month (d/m) format celebrate it on January 27. The first three 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
2024SatJan 27e-Day
2024WedFeb 7e-Day
2025MonJan 27e-Day
2025FriFeb 7e-Day
2026TueJan 27e-Day
2026SatFeb 7e-Day
2027WedJan 27e-Day
2027SunFeb 7e-Day
2028ThuJan 27e-Day
2028MonFeb 7e-Day
2029SatJan 27e-Day
2029WedFeb 7e-Day
2030SunJan 27e-Day
2030ThuFeb 7e-Day
2031MonJan 27e-Day
2031FriFeb 7e-Day
2032TueJan 27e-Day
2032SatFeb 7e-Day
2033ThuJan 27e-Day
2033MonFeb 7e-Day

See all Fun Holidays

Other Fun Holidays around February 7

5 Feb

Chocolate Fondue Day

Celebrate this sweet holiday with a huge fondue pot full of delicious and gooey melted chocolate. Don’t forget to share with family and friends!

6 Feb

Lame Duck Day

Lame Duck Day celebrates and honors all those who are on their way out from a job.

8 Feb

Laugh and Get Rich Day

Laugh and Get Rich Day encourages people to look at the lighter side of life and enjoy life while making money.