Calendar era facts for kids
| Gregorian calendar | 2025 MMXXV |
| Ab urbe condita | 2778 |
| Armenian calendar | 1474 ԹՎ ՌՆՀԴ |
| Assyrian calendar | 6775 |
| Bahá'í calendar | 181–182 |
| Balinese saka calendar | 1946–1947 |
| Bengali calendar | 1432 |
| Berber calendar | 2975 |
| British Regnal year | 73 Eliz. 2 – 74 Eliz. 2 |
| Buddhist calendar | 2569 |
| Burmese calendar | 1387 |
| Byzantine calendar | 7533–7534 |
| Chinese calendar | 甲辰年 (Wood Dragon) 4721 or 4661 — to — 乙巳年 (Wood Snake) 4722 or 4662 |
| Coptic calendar | 1741–1742 |
| Discordian calendar | 3191 |
| Ethiopian calendar | 2017–2018 |
| Hebrew calendar | 5785–5786 |
| Hindu calendars | |
| - Vikram Samvat | 2081–2082 |
| - Shaka Samvat | 1946–1947 |
| - Kali Yuga | 5125–5126 |
| Holocene calendar | 12025 |
| Igbo calendar | 1025–1026 |
| Iranian calendar | 1403–1404 |
| Islamic calendar | 1446–1447 |
| Japanese calendar | Reiwa 7 (令和７年) |
| Javanese calendar | 1958–1959 |
| Juche calendar | 114 |
| Julian calendar | Gregorian minus 13 days |
| Korean calendar | 4358 |
| Minguo calendar | ROC 114 民國114年 |
| Nanakshahi calendar | 557 |
| Thai solar calendar | 2568 |
| Tibetan calendar | 阳木龙年 (male Wood-Dragon) 2151 or 1770 or 998 — to — 阴木蛇年 (female Wood-Snake) 2152 or 1771 or 999 |
| Unix time | 1735689600 – 1767225599 |
A calendar era is the year numbering system used by a calendar. The Gregorian calendar for example numbers its years in the Western Anno Domini system (the Coptic Orthodox and Ethiopian Orthodox churches have their own Christian eras). The instant, date, or year from which time is marked is called the epoch of the era. There are many different calendar eras such as Saka Era.
In ancient times, regnal years were counted from the year a new monarch took the throne. This makes ancient timelines very difficult to reconstruct, because they are based on separate and scattered king lists, such as the Sumerian King List and the Babylonian Canon of Kings. In East Asia, having era names based on ruling monarchs ended in the 20th century except for Japan, where they are still used.
