Calendar Systems Worldwide
How Different Cultures Measure 年
Explore CalendarsWhile January 1, 2024 is recognized globally, it's also year 1445 in the Islamic calendar, 5784 in the Hebrew calendar, and year 4721 in the Chinese calendar. Different civilizations developed distinct systems for tracking days, months, and years, many still in active use today.
Major Calendar Systems
| Calendar | Type | Year Length | Current Year (approx) |
|---|---|---|---|
| Gregorian | Solar | 365/366 days | 2024 |
| Islamic (Hijri) | Lunar | 354/355 days | 1445-1446 |
| Hebrew (Jewish) | Lunisolar | 353-385 days | 5784-5785 |
| Chinese | Lunisolar | 353-385 days | 4721-4722 |
| Hindu (Vikram) | Lunisolar | 354-385 days | 2080-2081 |
| Buddhist | Various | 365/366 days | 2567-2568 |
| Persian (Solar Hijri) | Solar | 365/366 days | 1402-1403 |
| Ethiopian | Solar | 365/366 days | 2016-2017 |
The Gregorian Calendar
The international civil standard, introduced by Pope Gregory XIII in 1582 to correct drift in the Julian calendar.
Key Features
- Year 1 begins with birth of Jesus (by 6th-century calculation)
- 12 months of 28-31 days
- Leap year every 4 years, except centuries not divisible by 400
- Average year: 365.2425 days (very close to actual 365.2422)
Adoption Timeline
- Catholic countries: 1582
- Protestant countries: 1700s
- Britain/colonies: 1752
- Russia: 1918
- China: 1912 (officially)
Islamic (Hijri) Calendar
A purely lunar calendar used for Islamic religious observances.
Key Features
- Year 1 = 622 CE (Muhammad's migration to Medina)
- 12 lunar months of 29-30 days
- Year length: 354 or 355 days
- 月 rotate through seasons over ~33 years
月
Muharram, Safar, Rabi' al-Awwal, Rabi' al-Thani, Jumada al-Awwal, Jumada al-Thani, Rajab, Sha'ban, Ramadan, Shawwal, Dhu al-Qi'dah, Dhu al-Hijjah
Hebrew Calendar
A lunisolar calendar used for Jewish religious observances and as Israel's official calendar.
Key Features
- Year 1 = 3761 BCE (traditional creation date)
- 12 months in common years, 13 in leap years
- 19-year cycle with 7 leap years
- New year (Rosh Hashanah) falls in September-October
Leap Year Pattern
年 3, 6, 8, 11, 14, 17, 19 of the 19-year cycle add an extra month (Adar II).
Chinese Calendar
A lunisolar calendar used for traditional holidays and astrology throughout East Asia.
Key Features
- Traditionally starts 2637 BCE (Yellow Emperor)
- 12 or 13 lunar months per year
- Complex intercalation rules
- Chinese New Year falls January 21 - February 20
The 12-Year Cycle
Rat, Ox, Tiger, Rabbit, Dragon, Snake, Horse, Goat, Monkey, Rooster, Dog, Pig—combined with 10 Heavenly Stems for a 60-year cycle.
Other Notable Calendars
Persian (Solar Hijri)
Used in Iran and Afghanistan. Highly accurate solar calendar with year beginning at spring equinox.
Ethiopian Calendar
Solar calendar 7-8 years behind Gregorian. Ethiopia celebrates its own New Year (Enkutatash) in September.
Hindu Calendars
Multiple regional variants (Vikram Samvat, Shaka, etc.) used for religious festivals, lunisolar in nature.
まとめ
The Gregorian calendar dominates international commerce and communication, but many cultures maintain traditional calendars for religious and cultural purposes. Lunar calendars like the Islamic Hijri complete years in about 354 days; lunisolar systems like Hebrew and Chinese add periodic leap months to stay aligned with seasons. 理解する these systems helps when scheduling international events and respecting cultural observances.