| Millennium: | 2nd millennium |
|---|---|
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| 1740 by topic |
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| Gregorian calendar | 1740 MDCCXL |
| Ab urbe condita | 2493 |
| Armenian calendar | 1189 ԹՎ ՌՃՁԹ |
| Assyrian calendar | 6490 |
| Balinese saka calendar | 1661–1662 |
| Bengali calendar | 1147 |
| Berber calendar | 2690 |
| British Regnal year | 13 Geo. 2 – 14 Geo. 2 |
| Buddhist calendar | 2284 |
| Burmese calendar | 1102 |
| Byzantine calendar | 7248–7249 |
| Chinese calendar | 己未年 (Earth Goat) 4437 or 4230 — to — 庚申年 (Metal Monkey) 4438 or 4231 |
| Coptic calendar | 1456–1457 |
| Discordian calendar | 2906 |
| Ethiopian calendar | 1732–1733 |
| Hebrew calendar | 5500–5501 |
| Hindu calendars | |
| - Vikram Samvat | 1796–1797 |
| - Shaka Samvat | 1661–1662 |
| - Kali Yuga | 4840–4841 |
| Holocene calendar | 11740 |
| Igbo calendar | 740–741 |
| Iranian calendar | 1118–1119 |
| Islamic calendar | 1152–1153 |
| Japanese calendar | Genbun 5 (元文５年) |
| Javanese calendar | 1664–1665 |
| Julian calendar | Gregorian minus 11 days |
| Korean calendar | 4073 |
| Minguo calendar | 172 before ROC 民前172年 |
| Nanakshahi calendar | 272 |
| Thai solar calendar | 2282–2283 |
| Tibetan calendar | 阴土羊年 (female Earth-Goat) 1866 or 1485 or 713 — to — 阳金猴年 (male Iron-Monkey) 1867 or 1486 or 714 |
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1740 (MDCCXL) was a leap year starting on Friday of the Gregorian calendar and a leap year starting on Tuesday of the Julian calendar, the 1740th year of the Common Era (CE) and Anno Domini (AD) designations, the 740th year of the 2nd millennium, the 40th year of the 18th century, and the 1st year of the 1740s decade. As of the start of 1740, the Gregorian calendar was 11 days ahead of the Julian calendar, which remained in localized use until 1923.