1923 (MCMXXIII) was a common year starting on Monday of the Gregorian calendar, the 1923rd year of the Common Era (CE) and Anno Domini (AD) designations, the 923rd year of the 2nd millennium, the 23rd year of the 20th century, and the 4th year of the 1920s decade. As of the start of 1923, the Gregorian calendar was 13 days ahead of the Julian calendar, which was relegated that February to use only by churches after Greece adopted the Gregorian calendar.