1722 (MDCCXXII) was a common year starting on Thursday of the Gregorian calendar and a common year starting on Monday of the Julian calendar, the 1722nd year of the Common Era (CE) and Anno Domini (AD) designations, the 722nd year of the 2nd millennium, the 22nd year of the 18th century, and the 3rd year of the 1720s decade. As of the start of 1722, the Gregorian calendar was 11 days ahead of the Julian calendar, which remained in localized use until 1923.