1739 followed by 1740
1739 (MDCCXXXIX) was a common year starting on Thursday of the Gregorian calendar and a common year starting on Monday of the Julian calendar, the 1739th year of the Common Era (CE) and Anno Domini (AD) designations, the 739th  year of the 2nd millennium, the 39th  year of the 18th century, and the  10th  and last year of the 1730s decade. As of the start of 1739, the Gregorian calendar was 11 days ahead of the Julian calendar, which remained in localized use until 1923.