Spreadsheet Day 17 Oct 2023

Whether they"re a pivot table pro or an entry-level novice, spreadsheet users worldwide have one person to thank. Dan Bricklin released the first electronic spreadsheet programme on this day in 1979, a date now commemorated as Spreadsheet Day. The day celebrates the sophisticated grids that have reshaped businesses from accounting and engineering to education and project management. Like the spreadsheets that empower modern data handling, ancient civilisations also sought innovative ways to record and track the world around them.

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Today in History

Widespread and long-eared
17 Oct 2024Kochia, Hitachi, Ibaraki Prefecture, Japan
17 Oct 2025Rock River Falls, Upper Peninsula, Michigan, United States

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Starry, starry night
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18 Oct 2025International Archaeology Day
1 Aug 2024Floating fruit market, Kaptai Lake, Rangamati, Bangladesh
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5 Aug 2024Hertfordshire, England
15 Dec 2024Lake Misurina, Dolomites, Italy
16 Jan 2026Leopard at Etosha National Park, Namibia
11 Nov 2025Externsteine in the Teutoburg Forest, North Rhine-Westphalia, Germany
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The other great barrier reef
4 Oct 2023World Space Week
23 Oct 2025International Day of the Snow Leopard
27 Oct 2025Thick-billed raven, Simien Mountains, Ethiopia
11 Jan 2024Eurasian lynx
22 Sep 2023Hobbit Day
26 Jan 2024Big Garden Birdwatch
21 Aug 2025Wheatear, Peak District National Park, England
21 Jul 2024Kendwa village, Zanzibar, Tanzania
29 Nov 2023Rockefeller Centre Christmas Tree lighting
29 Sep 2023Castell Coch, Wales
1 Jan 2025Happy New Year!
5 Jul 2024Noah Beach, Queensland, Australia
17 Feb 2026Chinese New Year
12 Oct 2025Village of Saranac Lake, New York, United States
31 Mar 2026Paradise Cave, Phong Nha-Ke Bang National Park, Vietnam
A cantilevered window to the past