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Today I learned that Excel incorrectly assumes 1900 was a leap year, and Microsoft will never fix it because the whole house of cards would collapse

PC Gamer • Wed, 08 Apr 2026

Today I learned that Excel incorrectly assumes 1900 was a leap year, and Microsoft will never fix it because the whole house of cards would collapse

Luckily, most users don't build spreadsheets focused on 1900.

What happened?

Luckily, most users don't build spreadsheets focused on 1900.

Story details

Luckily, most users don't build spreadsheets focused on 1900.

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Original source

https://www.pcgamer.com/gaming-industry/today-i-learned-that-excel-incorrectly-assumes-1900-was-a-leap-year-and-microsoft-will-never-fix-it-because-the-whole-house-of-cards-would-collapse/