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.