(This article is about the year 1917.) 1917 (MCMXVII)was a common year starting on Monday (dominical letter G) of the Gregorian calendar and a common year starting on Sunday (dominical letter A) of the Julian calendar, the 1917th year of the Common Era (CE) and Anno Domini (AD) designations, the 917th year of the 2nd millennium, the 17th year of the 20th century, and the 8th year of the 1910s decade. As of the start of 1917, the Gregorian calendar was 13 days ahead of the Julian calendar, which remained in localized use until 1918.