1939 (MCMXXXIX) was a common year starting on Sunday of the Gregorian calendar, the 1939th year of the Common Era (CE) and Anno Domini (AD) designations, the 939th year of the 2nd millennium, the 39th year of the 20th century, and the 10th and last year of the 1930s decade. This year also marks the start of the Second World War, the largest and deadliest conflict in human history. Source: Wikipedia (en)