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July 22, 2026 • 11 mins

Why does entering a date like 11/40 in Excel or Microsoft Access turn into 2040 instead of 1940? The answer is Windows' two-digit year cutoff, a system setting that decides which century a two-digit year belongs to.

This episode explains why the cutoff exists, why Excel and Access can interpret dates the same way, and why the default behavior may be a problem for medical offices, genealogy work, museums, cemetery records, and other historical data entry.

Learn when changing the Windows cutoff may make sense, why relying on two-digit years can create inconsistent data between computers, and why entering a full four-digit year in ISO format is still the safest habit.

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