Spreadsheet Day
Spreadsheet Day is held on October 17. This event in the second decade of the month October is annual. 
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Spreadsheet Day has been celebrated since 2010. This is the date when the first VisiCalc spreadsheet program for personal computers was released - October 17, 1979.
A spreadsheet is a computer program that can capture, display and manipulate data arranged in rows and columns. Spreadsheets are one of the most popular tools available with personal computers. A spreadsheet is generally designed to hold numerical data and short text strings.
A spreadsheet is an easy way to store all different kinds of data. Excel was the first application to use a toolbar. The maximum length of an Excel formula is 8,192 characters. Any cell can contain only up to 32,767 characters. Up to 4,000,000,000 (yes, billion) formulas can depend on a single cell.
The UNIQUE function is a quick way to remove duplicate lines from a table of data in a spreadsheet. It returns the unique rows in the provided source range while discarding duplicates. The rows are returned in the order in which they first appear in the source range.
Similar holidays and events, festivals and interesting facts
Dictionary Day on October 16 (is held in honor of Noah Webster, the man who is considered to have fathered the American Dictionary);
Feral Cat Day on October 16 (Global Cat Day, Alley Cat Allies);
Steve Jobs Day on October 16 (was established by the Governor of California in memorial to this great innovator, who passed from the world in October of 2011);
Digital Society Day in India on October 17In 2017 Qualcomm announces the first 5G mobile connection, which has a connection speed of 1 Gbit/s. on October 17;
In 2016 a team at Australia's University of New South Wales create a new quantum bit that remains in a stable superposition for 10 times longer than previously achieved. on October 17;
Wear Something Gaudy Day on October 17
Get Smart About Credit Day on October 17 (was established by the ABA - American Bankers Association);In 2017 Alphabet announces an improved version of the AlphaGo artificial intelligence, developed by its subsidiary Google DeepMind. on October 18;
Confucius Day on October 18 (Confucius' birthday falls on the 27th day of the eighth lunar month according to the Chinese calendar);
No Beard Day on October 18
Bridge Day on October 18 (is an annual one-day festival in Fayetteville, Fayette County, West Virginia, United States);
Sweetest Day in Great Lakes region on October 18 (is celebrated on the third Saturday in October)
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