🗓
Day of Week
Monday
Day 1 of 7 (ISO)
📆
Month
December
12th month · 31 days
🔢
Day of Year
355
of 365 days in 2026
📊
Week Number
Week 52
ISO 8601 · 2026
🌙
Moon Phase
–
Calculating...
♐
Zodiac Sign
Sagittarius
Fire · Jupiter
🐴
Chinese Zodiac
Horse
Year of the Wood Horse
🌍
Quarter
Q4 2026
Days left in year: 10
🌐 This Date in Other Calendar Systems
GregorianDecember 21, 2026
Hijri (Islamic)10 Rajab 1448 AH
Persian (Solar Hijri)21 Azar 1405 SH
ISO 86012026-12-21
Unix Timestamp1797811200
Julian Day2461396
📋 Date Facts
| Full date | Monday, December 21, 2026 |
| US short date | 12/21/2026 |
| European date | 21/12/2026 |
| Day of year | 355 of 365 |
| Week of year (ISO) | Week 52 |
| Leap year? | No — 2026 has 365 days |
| Days in month | 31 days (December) |
| Days remaining in year | 10 days |
🌅 Sun & Astronomy
| Season (N. Hemisphere) | Winter ❄️ |
| Season (S. Hemisphere) | Summer ☀️ |
| Zodiac sign | ♐ Sagittarius |
| Chinese zodiac | 🐴 Horse (Wood) |
| Moon phase (approx.) | Calculating... |
| Days since year start | 355 |
| Days until year end | 10 |
| Quarter | Q4 |
📜 December 21 in History
1926
Historical records for this date are being compiled.
1976
Notable events from December 21 in history.
🎂 Age Calculator — As of December 21, 2026
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