| Years |
|---|
| Millennium |
| 2nd millennium |
| Centuries |
| Decades |
| Years |
| Gregorian calendar | 1234 MCCXXXIV |
| Ab urbe condita | 1987 |
| Armenian calendar | 683 ԹՎ ՈՁԳ |
| Assyrian calendar | 5984 |
| Balinese saka calendar | 1155–1156 |
| Bengali calendar | 641 |
| Berber calendar | 2184 |
| English Regnal year | 18 Hen. 3 – 19 Hen. 3 |
| Buddhist calendar | 1778 |
| Burmese calendar | 596 |
| Byzantine calendar | 6742–6743 |
| Chinese calendar | 癸巳年 (Water Snake) 3930 or 3870 — to — 甲午年 (Wood Horse) 3931 or 3871 |
| Coptic calendar | 950–951 |
| Discordian calendar | 2400 |
| Ethiopian calendar | 1226–1227 |
| Hebrew calendar | 4994–4995 |
| Hindu calendars | |
| - Vikram Samvat | 1290–1291 |
| - Shaka Samvat | 1155–1156 |
| - Kali Yuga | 4334–4335 |
| Holocene calendar | 11234 |
| Igbo calendar | 234–235 |
| Iranian calendar | 612–613 |
| Islamic calendar | 631–632 |
| Japanese calendar | Tenpuku 2 / Bunryaku 1 (文暦元年) |
| Javanese calendar | 1143–1144 |
| Julian calendar | 1234 MCCXXXIV |
| Korean calendar | 3567 |
| Minguo calendar | 678 before ROC 民前678年 |
| Nanakshahi calendar | −234 |
| Thai solar calendar | 1776–1777 |
| Tibetan calendar | ཆུ་མོ་སྦྲུལ་ལོ་ (female Water-Snake) 1360 or 979 or 207 — to — ཤིང་ཕོ་རྟ་ལོ་ (male Wood-Horse) 1361 or 980 or 208 |
1234 (MCCXXXIV) was a common year starting on Sunday of the Julian calendar, the 1234th year of the Common Era (CE) and Anno Domini (AD) designations, the 234th year of the 2nd millennium, the 34th year of the 13th century, and the 5th year of the 1230s decade. As of the start of 1234, the Gregorian calendar was 7 days ahead of the Julian calendar, which was the dominant calendar of the time.