MDBCs 07 Feb 2023

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.

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?

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Send a Card to a Friend Day

February 7 is Send a Card to a Friend Day.

The unofficial holiday encourages people to send a card to a friend to let them know that they haven't been forgotten.

Stay Connected

While we all love our friends and would like to keep in touch with them all the time, daily life can sometimes make it hard to stay connected. If you are unable to keep up with the lives and times of your friends, then Send a Card to a Friend Day is the prefect excuse to take some time during the day to write a note to a dear friend to let them know you are thinking of them.

How to Celebrate?

Celebrating this holiday is very simple. Take some time out of your busy day and write notes to your friends.
Everyone loves a handwritten note, but if you can’t do that send them an e-card or even an email. No one will judge you as long as they hear from you.

Did You Know…

…that the earliest known greeting card is a Valentine’s Day card thought to have been sent sometime in the 1400s?

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A: The water. Butane is lighter fluid.

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