1699 (MDCXCIX) was a common year starting on Thursday of the Gregorian calendar and a common year starting on Sunday of the Julian calendar, the 1699th year of the Common Era (CE) and Anno Domini (AD) designations, the 699th year of the 2nd millennium, the 99th year of the 17th century, and the 10th and last year of the 1690s decade. As of the start of 1699, the Gregorian calendar was 10 days ahead of the Julian calendar, which remained in localized use until 1923.