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 deadliest conflict in human history.
[wikipedia]