| Millennium: | 2nd millennium |
|---|---|
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| Years: |
| 1742 by topic |
|---|
| Arts and science |
| Countries |
| Lists of leaders |
| Birth and death categories |
| Establishments and disestablishments categories |
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| Gregorian calendar | 1742 MDCCXLII |
| Ab urbe condita | 2495 |
| Armenian calendar | 1191 ԹՎ ՌՃՂԱ |
| Assyrian calendar | 6492 |
| Balinese saka calendar | 1663–1664 |
| Bengali calendar | 1149 |
| Berber calendar | 2692 |
| British Regnal year | 15 Geo. 2 – 16 Geo. 2 |
| Buddhist calendar | 2286 |
| Burmese calendar | 1104 |
| Byzantine calendar | 7250–7251 |
| Chinese calendar | 辛酉年 (Metal Rooster) 4439 or 4232 — to — 壬戌年 (Water Dog) 4440 or 4233 |
| Coptic calendar | 1458–1459 |
| Discordian calendar | 2908 |
| Ethiopian calendar | 1734–1735 |
| Hebrew calendar | 5502–5503 |
| Hindu calendars | |
| - Vikram Samvat | 1798–1799 |
| - Shaka Samvat | 1663–1664 |
| - Kali Yuga | 4842–4843 |
| Holocene calendar | 11742 |
| Igbo calendar | 742–743 |
| Iranian calendar | 1120–1121 |
| Islamic calendar | 1154–1155 |
| Japanese calendar | Kanpō 2 (寛保２年) |
| Javanese calendar | 1666–1667 |
| Julian calendar | Gregorian minus 11 days |
| Korean calendar | 4075 |
| Minguo calendar | 170 before ROC 民前170年 |
| Nanakshahi calendar | 274 |
| Thai solar calendar | 2284–2285 |
| Tibetan calendar | 阴金鸡年 (female Iron-Rooster) 1868 or 1487 or 715 — to — 阳水狗年 (male Water-Dog) 1869 or 1488 or 716 |
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1742 (MDCCXLII) was a common year starting on Monday of the Gregorian calendar and a common year starting on Friday of the Julian calendar, the 1742nd year of the Common Era (CE) and Anno Domini (AD) designations, the 742nd year of the 2nd millennium, the 42nd year of the 18th century, and the 3rd year of the 1740s decade. As of the start of 1742, the Gregorian calendar was 11 days ahead of the Julian calendar, which remained in localized use until 1923.