Whatistheday/Born on December 20

Famous Birthdays on December 20

Zodiac SignSagittarius

Born December 20, 2026?Year of the Horse

This date in 2026View full date page →

Notable People Born on December 20

Birthday Zodiac: Sagittarius

Everyone born on December 20 shares the Western zodiac sign Sagittarius. The Chinese zodiac animal, however, depends on the birth year — someone born on December 20 in 2026 is a Horse, while a person born on the same date in 2014 is also a Horse (the cycle repeats every 12 years). Explore the Chinese calendar for more.

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Whatistheday – Day of the Week Calculator

Whatistheday is a free weekday calculator and multi-calendar date converter. Find the exact day of the week for any date — past, present, or future — with 100% mathematical accuracy.

Features

Weekday Calculator: Instantly determine what day of the week any date falls on, from 4000 BC to thousands of years in the future.
10+ Calendar Systems: Convert dates across Gregorian, Hebrew, Islamic (Hijri), Julian, Chinese Lunar, Hindu (Vikram Samvat), Maya (Long Count), Egyptian, and Babylonian calendars.
BC/BCE Support: Full support for ancient and historical dates using the Proleptic Gregorian and Julian calendar systems with astronomical year numbering.
Date Calculators: Business days calculator, age calculator, date difference, day of year, ISO week number, and leap year checker.
50+ Country Holidays: View public holidays and countdowns for over 50 countries worldwide.

Accuracy

Our engine uses the Proleptic Gregorian Calendar for modern and future dates and the Julian Calendar for dates before the Gregorian Reform of 1582. This dual-system approach ensures historically accurate weekday results for any era, making it ideal for academic research, genealogy, and religious calendar synchronization.

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