| Millennium: | 2nd millennium |
|---|---|
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| 1723 by topic |
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| Arts and science |
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| Gregorian calendar | 1723 MDCCXXIII |
| Ab urbe condita | 2476 |
| Armenian calendar | 1172 ԹՎ ՌՃՀԲ |
| Assyrian calendar | 6473 |
| Balinese saka calendar | 1644–1645 |
| Bengali calendar | 1130 |
| Berber calendar | 2673 |
| British Regnal year | 9 Geo. 1 – 10 Geo. 1 |
| Buddhist calendar | 2267 |
| Burmese calendar | 1085 |
| Byzantine calendar | 7231–7232 |
| Chinese calendar | 壬寅年 (Water Tiger) 4420 or 4213 — to — 癸卯年 (Water Rabbit) 4421 or 4214 |
| Coptic calendar | 1439–1440 |
| Discordian calendar | 2889 |
| Ethiopian calendar | 1715–1716 |
| Hebrew calendar | 5483–5484 |
| Hindu calendars | |
| - Vikram Samvat | 1779–1780 |
| - Shaka Samvat | 1644–1645 |
| - Kali Yuga | 4823–4824 |
| Holocene calendar | 11723 |
| Igbo calendar | 723–724 |
| Iranian calendar | 1101–1102 |
| Islamic calendar | 1135–1136 |
| Japanese calendar | Kyōhō 8 (享保８年) |
| Javanese calendar | 1647–1648 |
| Julian calendar | Gregorian minus 11 days |
| Korean calendar | 4056 |
| Minguo calendar | 189 before ROC 民前189年 |
| Nanakshahi calendar | 255 |
| Thai solar calendar | 2265–2266 |
| Tibetan calendar | 阳水虎年 (male Water-Tiger) 1849 or 1468 or 696 — to — 阴水兔年 (female Water-Rabbit) 1850 or 1469 or 697 |
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1723 (MDCCXXIII) was a common year starting on Friday of the Gregorian calendar and a common year starting on Tuesday of the Julian calendar, the 1723rd year of the Common Era (CE) and Anno Domini (AD) designations, the 723rd year of the 2nd millennium, the 23rd year of the 18th century, and the 4th year of the 1720s decade. As of the start of 1723, the Gregorian calendar was 11 days ahead of the Julian calendar, which remained in localized use until 1923.