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Why Does February Have Only 28 Days?

Why Does February Have Only 28 Days?
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Saturday, 31 October 2026 · ISO week 44 · day 304 of the year

Computed on every visit from the time-zone database and standard astronomical formulas, so these never go stale. The article below is unchanged.

February has 28 days because of an ancient Roman calendar reform around 700 BCE by King Numa Pompilius, who assigned it an unlucky even length to balance the full year. Roman superstition considered even numbers unlucky, so other months received odd counts of 29 or 31 days, leaving February—the somber month of purification at the year’s tail end—to absorb the required 28 days.

This guide explains the history behind February’s unique length, including Julius Caesar’s 45 BCE leap day system and the legend surrounding Augustus. It also covers political calendar manipulation by Roman pontifices, February’s rare full moon patterns, and why twentieth-century attempts like the International Fixed Calendar failed.

Sources: February 28

Frequently asked questions

What is the short answer?
See the summary above — the rest of this guide gives the detail, examples and the reasoning behind it.
Where do these figures come from?
Every date and time figure here is computed from published astronomical and calendar rules, not copied from other tables.
Can I calculate this myself?
Yes — the free tools on itsdately do the exact calculation for any date, city or calendar in seconds.

Related on itsdately: How Leap Years Work in Other Calendars · How the Hebrew Calendar Adds a Whole Leap Month · The Hindu Panchang: Five Measurements in Every Single Day

Further reading: Encyclopaedia Britannica — Calendar

Yasir Hafeez

About Yasir Hafeez

Yasir Hafeez is the creator of itsdately a free, independent site for clear world time, calendars, and date tools.

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