Fibonacci Day 2017: When Is Fibonacci Day? 🗓

When is Fibonacci Day 2017? This year Fibonacci Day is celebrated on a Thursday, November 23, 2017. In 2018, Fibonacci Day is on Friday, November 23, 2018.

November 23 is Fibonacci Day, an annual holiday that honors one of the most influential mathematicians of the Middle Ages – Leonardo Bonacci.

Also known as Leonardo of Pisa, he is popularly known as Leonardo Fibonacci. Fibonacci is a contraction of filo Bonacci, meaning the son of Bonaccio.

Countdown to Fibonacci Day date is below, plus holiday history, celebration info, facts and holiday details.

When is Fibonacci Day 2017? This year Fibonacci Day is on Thursday, November 23, 2017.


November 23 is celebrated as Fibonacci day because when the date is written in the mm/dd format (11/23), the digits in the date form a Fibonacci sequence: 1,1,2,3. A Fibonacci sequence is a series of numbers where a number is the sum of the two numbers before it. For example: 1, 1, 2, 3…is a Fibonacci sequence. Here, 2 is the sum of the two numbers before it (1+1). Similarly, 3 is the sum of the two numbers before it (1+2).

Below you will find all the details for Fibonacci Day 2017 including, are banks open, is there mail delivery and related holiday information.

Is Fibonacci Day a federal holiday?

No, Fibonacci Day is not a federal holiday. There are ten annual US federal holidays on the calendar designated by the United States Congress. The following federal holidays are established by law:

  • New Year’s Day
  • Birthday of Martin Luther King, Jr. (Third Monday in January).
  • Washington’s Birthday (Third Monday in February)
  • Memorial Day (Last Monday in May)
  • Independence Day (July 4)
  • Labor Day (First Monday in September)
  • Columbus Day (Second Monday in October)
  • Veterans Day (November 11)
  • Thanksgiving Day (Fourth Thursday in November)
  • Christmas Day (December 25)

Is Fibonacci Day a national holiday?

Fibonacci Day is not a national holiday. Unlike many other countries, there are no ‘national holidays’ in the United States because Congress only has constitutional authority to create holidays for federal institutions. Most federal holidays are also observered as state holidays.

Is Fibonacci Day a paid holiday?

No, Fibonacci Day is not a paid holiday. The Fair Labor Standards Act (FLSA) does not require payment for time not worked, such as vacations or holidays (federal or otherwise).

Does the mail run on Fibonacci Day?

Yes, there will be mail delivery on Fibonacci Day. All post offices and federal offices of any kind will be open for the holiday, which means businesses and homes will receive mail. This also counts USPS and Fedex packages. See holiday schedule on USPS and Fedex. The only time mail is not being delivered is on federal holidays, which are listed above.

Are banks open on Fibonacci Day?

Fibonacci Day is a Fun holiday, which means all federal offices, courts and most banks will be open. While most banks are open, some banks can operate on their own schedules, so it may be best to check with your local branches. U.S. stock and bond markets like the New York Stock Exchange and NASDAQ will be open. Grocery stores and malls are reportedly open.

If your bank is closed, it is still possible to conduct general banking transactions via ATM, online banking or your mobile phone. Apps and websites are running though not all normal functions may be accessed for the holiday.

Are stores open on Fibonacci Day?

On Fibonacci Day, most stores, restaurants, shopping centers, and malls are open. There are no holidays on which all businesses are closed by law. However, some stores may have shortened or extended holiday hours for the day. Stores may be operating on holiday schedule with limited or reduced hours of operation. Some businesses may be closed on in order to give their employees the day off. For restaurants, stores and other establishments specific to your area, you will have to check with the individual business.

Shop Fibonacci Day Gifts on Amazon

Fibonacci Day 2017

Holiday: Fibonacci Day
Date: November 23, 2017
Weekday: Thursday
Holiday Type: Fun
Fibonacci Day 2018: Friday, November 23, 2018
Fibonacci Day 2019: Saturday, November 23, 2019
Fibonacci Day 2020: Monday, November 23, 2020

Fun Holiday Fact

Did you know …that the ratio of two successive numbers in the Fibonacci sequence is very close to the Golden Ratio? The Golden Ratio is approximately equal to 1.

How To Celebrate Fibonacci Day

Start the day by learning more about the Fibonacci sequence and its theoretical and practical uses.

A number of fruits and vegetables, like pineapples, romanesco (a cross between broccoli and cauliflower) display the Fibonacci series – incorporate them in your meals to celebrate this mathematical holiday.

Have children in your life? Introduce them to the elegance of math and the importance of learning it to use in real life.

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