1823 followed by 1824
1823 (MDCCCXXIII) was a common year starting on Wednesday of the Gregorian calendar and a common year starting on Monday of the Julian calendar, the 1823rd year of the Common Era (CE) and Anno Domini (AD) designations, the 823rd  year of the 2nd millennium, the 23rd  year of the 19th century, and the  4th   year of the 1820s decade. As of the start of 1823, the Gregorian calendar was 12 days ahead of the Julian calendar, which remained in localized use until 1923.