| Millennium: | 2nd millennium |
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January 15: King Felipe V of Spain abdicates in favor of his son, who becomes King Luis I but dies 7 months later.
| 1724 by topic |
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| Gregorian calendar | 1724 MDCCXXIV |
| Ab urbe condita | 2477 |
| Armenian calendar | 1173 ԹՎ ՌՃՀԳ |
| Assyrian calendar | 6474 |
| Balinese saka calendar | 1645–1646 |
| Bengali calendar | 1131 |
| Berber calendar | 2674 |
| British Regnal year | 10 Geo. 1 – 11 Geo. 1 |
| Buddhist calendar | 2268 |
| Burmese calendar | 1086 |
| Byzantine calendar | 7232–7233 |
| Chinese calendar | 癸卯年 (Water Rabbit) 4421 or 4214 — to — 甲辰年 (Wood Dragon) 4422 or 4215 |
| Coptic calendar | 1440–1441 |
| Discordian calendar | 2890 |
| Ethiopian calendar | 1716–1717 |
| Hebrew calendar | 5484–5485 |
| Hindu calendars | |
| - Vikram Samvat | 1780–1781 |
| - Shaka Samvat | 1645–1646 |
| - Kali Yuga | 4824–4825 |
| Holocene calendar | 11724 |
| Igbo calendar | 724–725 |
| Iranian calendar | 1102–1103 |
| Islamic calendar | 1136–1137 |
| Japanese calendar | Kyōhō 9 (享保９年) |
| Javanese calendar | 1648–1649 |
| Julian calendar | Gregorian minus 11 days |
| Korean calendar | 4057 |
| Minguo calendar | 188 before ROC 民前188年 |
| Nanakshahi calendar | 256 |
| Thai solar calendar | 2266–2267 |
| Tibetan calendar | 阴水兔年 (female Water-Rabbit) 1850 or 1469 or 697 — to — 阳木龙年 (male Wood-Dragon) 1851 or 1470 or 698 |
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1724 (MDCCXXIV) was a leap year starting on Saturday of the Gregorian calendar and a leap year starting on Wednesday of the Julian calendar, the 1724th year of the Common Era (CE) and Anno Domini (AD) designations, the 724th year of the 2nd millennium, the 24th year of the 18th century, and the 5th year of the 1720s decade. As of the start of 1724, the Gregorian calendar was 11 days ahead of the Julian calendar, which remained in localized use until 1923.