1860 followed by 1861
1860 (MDCCCLX) was a leap year starting on Sunday of the Gregorian calendar and a leap year starting on Friday of the Julian calendar, the 1860th year of the Common Era (CE) and Anno Domini (AD) designations, the 860th  year of the 2nd millennium, the 60th  year of the 19th century, and the  1st   year of the 1860s decade. As of the start of 1860, the Gregorian calendar was 12 days ahead of the Julian calendar, which remained in localized use until 1923.