Excel incorrectly assumes that the year 1900 is a leap year

📊 Bug Alert: Excel's date calculation flaw stems from its incorrect assumption that the year 1900 is a leap year, resulting in potential errors in financial and calendar-based calculations. This anomaly can lead to significant discrepancies in data analysis and planning, making it essential to be aware of this quirk when working with date-related functions in Excel. By understanding this flaw, users can take corrective measures to ensure accurate calculations and reliable results.

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https://news.ycombinator.com/item?id=47393225

source_url

https://learn.microsoft.com/en-us/troubleshoot/microsoft-365-apps/excel/wrongly-assumes-1900-is-leap-year

author_name

susam

id: 858
uid: qS6hX
insdate: 2026-03-16 01:05:14
title: Excel incorrectly assumes that the year 1900 is a leap year
additional: 📊 Bug Alert: Excel's date calculation flaw stems from its incorrect assumption that the year 1900 is a leap year, resulting in potential errors in financial and calendar-based calculations. This anomaly can lead to significant discrepancies in data analysis and planning, making it essential to be aware of this quirk when working with date-related functions in Excel. By understanding this flaw, users can take corrective measures to ensure accurate calculations and reliable results.
category: Hacker News
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guid: https://news.ycombinator.com/item?id=47393225
source_url: https://learn.microsoft.com/en-us/troubleshoot/microsoft-365-apps/excel/wrongly-assumes-1900-is-leap-year
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author_name: susam
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