1836 followed by 1837
1836 (MDCCCXXXVI) was a leap year starting on Friday of the Gregorian calendar and a leap year starting on Wednesday of the Julian calendar, the 1836th year of the Common Era (CE) and Anno Domini (AD) designations, the 836th  year of the 2nd millennium, the 36th  year of the 19th century, and the  7th   year of the 1830s decade. As of the start of 1836, the Gregorian calendar was 12 days ahead of the Julian calendar, which remained in localized use until 1923.