What day is December 21, 2027?
December 21, 2027 is a Tuesday.
December 21, 2027
It's Tuesday
December 21, 2027
21 December 2027 is 30 Azar 1406 in the Persian Solar Hijri calendar. See Persian months, the Persian date converter, or today in the Persian calendar.
December 21, 2027 is a Tuesday. 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 Julian Day Number (JDN) conversion, a continuous day count that maps a civil date to its weekday without lookup tables. Dates from 15 October 1582 use the Gregorian calendar; earlier dates use the Julian calendar.
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.
Calendar Conversions
🌍 Gregorian Calendar
The most widely used civil calendar worldwide, introduced by Pope Gregory XIII in 1582.
✡️ Hebrew Calendar
A lunisolar calendar used for Jewish religious observances and civil purposes in Israel.
☪️ Islamic (Hijri) Calendar
A lunar calendar used in Islamic countries, beginning from the Hijra in 622 CE.
🐉 Chinese Lunar Calendar
A lunisolar calendar. The zodiac animal year follows Chinese Lunar New Year when that date is stored, or the Lichun solar term (about 4 February) when it is not.
🏛️ Julian Calendar
The predecessor to the Gregorian calendar, introduced by Julius Caesar in 45 BCE.
🕉️ Hindu (Vikram Samvat)
Traditional Hindu calendar system widely used in India and Nepal.
🗿 Maya Calendar
Ancient Mesoamerican calendar system with multiple interlocking cycles.
🔺 Egyptian Calendar
Ancient Egyptian civil calendar with 365 days, used for agricultural purposes.
🏺 Babylonian Calendar
Ancient Mesopotamian lunisolar calendar system.
📜 Proleptic Julian (BC)
Julian calendar extended to all years including BC/BCE using astronomical year numbering (no year 0 displayed).
📆 Proleptic Gregorian
The Gregorian calendar extended backwards before its 1582 adoption — shows what the modern date would be for historical dates.
🌸 Persian (Solar Hijri)
The official calendar of Iran and Afghanistan. A precise solar calendar starting from the Hijra of Muhammad in 622 CE. Year begins at the vernal equinox (Nowruz).
☸️ Buddhist (Thai)
Used in Thailand and other Buddhist countries. Buddhist Era (BE) is 543 years ahead of the Gregorian calendar, counting from the traditional date of the Buddha's parinirvana.
✝️ Coptic Calendar
A solar calendar used by the Coptic Orthodox Church in Egypt. Has 13 months (12 of 30 days + 1 of 5 or 6 days). Era begins in 284 CE (Diocletian Era).
🇪🇹 Ethiopian Calendar
Official calendar of Ethiopia. Similar to the Coptic calendar with 13 months, but 7–8 years behind the Gregorian calendar. New Year (Enkutatash) falls in September.
Historical Milestone — On This Day
Events, births and deaths on December 21 in history.
Frequently Asked Questions
What day of the week is December 21, 2027?
December 21, 2027 is a Tuesday. It is day 355 of 2027, in week 51.
Is December 21, 2027 a weekend or a weekday?
December 21, 2027 is a Tuesday, which is a weekday (Monday–Friday).
What is December 21, 2027 in the Hebrew calendar?
December 21, 2027 corresponds to כ״א כִּסְלֵו תשפ״ח in the Hebrew calendar.
What is December 21, 2027 in the Islamic (Hijri) calendar?
December 21, 2027 corresponds to 22 Rajab 1449 AH in the Islamic Hijri calendar.
What is December 21, 2027 in the Persian (Solar Hijri) calendar?
21 December 2027 (30 Azar 1406) in the Persian Solar Hijri calendar.
What is December 21, 2027 in the Julian calendar?
December 21, 2027 (Gregorian) corresponds to December 8, 2027 (Julian) in the Julian calendar.
What Chinese zodiac year is December 21, 2027?
December 21, 2027 falls in the 丁未 - Year of the Goat (2027, lunar New Year) according to the Chinese lunisolar calendar.
What is December 21, 2027 in the Hindu (Vikram Samvat) calendar?
December 21, 2027 corresponds to 24 Pausha 2084 VS in the Hindu Vikram Samvat calendar.
What day number is December 21, 2027 in the year?
December 21, 2027 is day 355 of 2027. There are 365 days in 2027.