Welcome to the Spreadsheet Day blog, which celebrates the joy and challenges of working with spreadsheets.

In 2010, we picked October 17th as Spreadsheet Day, because VisiCalc, the first spreadsheet for personal computers, was released on October 17th, 1979. I’m Debra Dalgleish, owner of the Contextures Excel website and blog.

Here is a brief history of Spreadsheet Day:


  • In February 2010, I proposed that we celebrate Spreadsheet Day, and asked for suggestions for an appropriate date.
  • In March 2010, I conducted a poll, to vote for the date, based on all the suggestions
  • October 17th was the winning date — it was the VisiCalc release date, in 1979
  • This Spreadsheet Day blog was created in July 2010, to serve as a coordination point for the annual event
  • In early October 2010, I reminded readers that the first Spreadsheet Day was only a week away
  • On the first Spreadsheet Day, Oct. 17, 2010, I posted announcements on this blog, and on my Contextures blog.


2012 – 2013

2014 – Present

  • Spreadsheet Day got more publicity in 2014, which was the 35th anniversary of the VisiCalc release.
  • Even Dan Bricklin re-tweeted a Spreadsheet Day announcement, so that must make it an official celebration!


Why are there sunflowers in the header image? As I said on my Contextures blog in 2010, “Why not? They’re lined up nicely, like a spreadsheet grid, and they look like they’re celebrating.”