| Millennium: | 2nd millennium |
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1770 (MDCCLXX) was a common year starting on Monday of the Gregorian calendar and a common year starting on Friday of the Julian calendar, the 1770th year of the Common Era (CE) and Anno Domini (AD) designations, the 770th year of the 2nd millennium, the 70th year of the 18th century, and the 1st year of the 1770s decade. As of the start of 1770, the Gregorian calendar was 11 days ahead of the Julian calendar, which remained in localized use until 1923.
| 1770 by topic |
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| Gregorian calendar | 1770 MDCCLXX |
| Ab urbe condita | 2523 |
| Armenian calendar | 1219 ԹՎ ՌՄԺԹ |
| Assyrian calendar | 6520 |
| Balinese saka calendar | 1691–1692 |
| Bengali calendar | 1177 |
| Berber calendar | 2720 |
| British Regnal year | 10 Geo. 3 – 11 Geo. 3 |
| Buddhist calendar | 2314 |
| Burmese calendar | 1132 |
| Byzantine calendar | 7278–7279 |
| Chinese calendar | 己丑年 (Earth Ox) 4467 or 4260 — to — 庚寅年 (Metal Tiger) 4468 or 4261 |
| Coptic calendar | 1486–1487 |
| Discordian calendar | 2936 |
| Ethiopian calendar | 1762–1763 |
| Hebrew calendar | 5530–5531 |
| Hindu calendars | |
| - Vikram Samvat | 1826–1827 |
| - Shaka Samvat | 1691–1692 |
| - Kali Yuga | 4870–4871 |
| Holocene calendar | 11770 |
| Igbo calendar | 770–771 |
| Iranian calendar | 1148–1149 |
| Islamic calendar | 1183–1184 |
| Japanese calendar | Meiwa 7 (明和７年) |
| Javanese calendar | 1695–1696 |
| Julian calendar | Gregorian minus 11 days |
| Korean calendar | 4103 |
| Minguo calendar | 142 before ROC 民前142年 |
| Nanakshahi calendar | 302 |
| Thai solar calendar | 2312–2313 |
| Tibetan calendar | 阴土牛年 (female Earth-Ox) 1896 or 1515 or 743 — to — 阳金虎年 (male Iron-Tiger) 1897 or 1516 or 744 |
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