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The following search returns a Knowledge answer from Wolfram|Alpha of "Saturday, May 17, 2025":

https://kagi.com/search?q=tax+day+2025

The link in the ⓘ icon's tooltip goes here where there don't seem to be any instances of May 17th (or even just "May"):

https://www.wolframalpha.com/input?i=tax+day+2025

For either the correct date to be displayed, or no date at all.

The correct date is April 14th, 2025:

https://www.irs.gov/filing/individuals/when-to-file#:~:text=File%20on:,2025

    i15e Going to the Wolfram|Alpha link you provided, WA first assumes it's a formula:

    Clicking on "use as holiday" shows this:

    Seems like this is an issue with Wolfram|Alpha, not Kagi.

        21 days later

        Can confirm this for Canada as well. The top result from canada.ca actually also shows the correct date of April 30th so I guess it's purely W|A just having wrong data across the board.

        However, Quick Answer gives a great result:

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