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How to fix proper formatting of dates prior to 1900.

Stennis 0 Reputation points
2026-02-17T20:09:49.49+00:00

How to fix proper formatting of dates prior to 1900. I selected the date format pattern of yyyy-dd-mm, but if I enter a date prior to 1900 the formatting does not work

Microsoft 365 and Office | Excel | For home | Windows
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  1. Aymeric-B 27,775 Reputation points Independent Advisor
    2026-02-17T20:49:10.3066667+00:00

    Hello !

    This is a known limitation in Microsoft Excel, not a formatting mistake.
    Excel does not store dates earlier than January 1st, 1900 as real date values.
    You'll need to store your date as a text, or split year/month/day by creating three different columns.
    Once you have your three different columns, you can use the text formula and the & symbol to join the text together.

    Please let me know if you have any other question !

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