1865 ( MDCCCLXV ) was a common year starting on Sunday of the Gregorian calendar ?and a common year starting on Friday of the Julian calendar , the 1865th year of the Common Era (CE) and Anno Domini (AD) designations, the 865th year of the 2nd?millennium , the 65th year of the 19th?century , and the 6th year of the 1860s decade. As of the start of 1865, the Gregorian calendar was 12 days ahead of the Julian calendar, which remained in localized use until 1923.