1841 followed by 1842
1841 (MDCCCXLI) was a common year starting on Friday of the Gregorian calendar and a common year starting on Wednesday of the Julian calendar, the 1841st year of the Common Era (CE) and Anno Domini (AD) designations, the 841st  year of the 2nd millennium, the 41st  year of the 19th century, and the  2nd   year of the 1840s decade. As of the start of 1841, the Gregorian calendar was 12 days ahead of the Julian calendar, which remained in localized use until 1923.