What day is December 31, 2026?
December 31, 2026 is a Thursday, day 365 of 2026.
December 31, 2026
It's Thursday
December 31, 2026
Persian (Solar Hijri) date: 10 Dey 1405. Open the Persian date converter or see today in the Persian calendar.
December 31, 2026 is a Thursday. Below you'll find this date converted across multiple world calendar systems including Hebrew, Islamic, Persian (Solar Hijri), Julian, Chinese, and more.
How do we know the weekday? We use Zeller's congruence — a proven mathematical formula that maps any Gregorian date to its day of the week without lookup tables.
Whether you're planning events, doing historical research, or simply curious about what day of the week a date falls on, this page provides instant answers with verified calendar conversions. All calculations use established astronomical algorithms. Learn about our methodology.
🎗️ December 31 is also New Year's Eve
Historical Milestone — On This Day
Did you know? Every day in history has a story. We are currently expanding our historical database!
Frequently Asked Questions
What day of the week is December 31, 2026?
December 31, 2026 is a Thursday. It is day 365 of 2026, in week 53.
Is December 31, 2026 a weekend or a weekday?
December 31, 2026 is a Thursday, which is a weekday (Monday–Friday).
What is December 31, 2026 in the Persian (Solar Hijri) calendar?
December 31, 2026 is 10 Dey 1405 in the Persian Solar Hijri calendar.
What day number is December 31, 2026 in the year?
December 31, 2026 is day 365 of 2026. There are 365 days in 2026.