1824 followed by 1825
1824 (MDCCCXXIV) was a leap year starting on Thursday of the Gregorian calendar and a leap year starting on Tuesday of the Julian calendar, the 1824th year of the Common Era (CE) and Anno Domini (AD) designations, the 824th  year of the 2nd millennium, the 24th  year of the 19th century, and the  5th   year of the 1820s decade. As of the start of 1824, the Gregorian calendar was 12 days ahead of the Julian calendar, which remained in localized use until 1923.