1912 followed by 1913
1912 (MCMXII) was a leap year starting on Monday of the Gregorian calendar and a leap year starting on Sunday of the Julian calendar, the 1912th year of the Common Era (CE) and Anno Domini (AD) designations, the 912th  year of the 2nd millennium, the 12th  year of the 20th century, and the  3rd   year of the 1910s decade. As of the start of 1912, the Gregorian calendar was 13 days ahead of the Julian calendar, which remained in localized use until 1923.  
This year is notable for the sinking of the Titanic on April 15, 1912.