1863 followed by 1864
1863 (MDCCCLXIII) was a common year starting on Thursday of the Gregorian calendar and a common year starting on Tuesday of the Julian calendar, the 1863rd year of the Common Era (CE) and Anno Domini (AD) designations, the 863rd  year of the 2nd millennium, the 63rd  year of the 19th century, and the  4th   year of the 1860s decade. As of the start of 1863, the Gregorian calendar was 12 days ahead of the Julian calendar, which remained in localized use until 1923.