January 31st is the thirty-first day in the Gregorian calendar. On this day, U.S. President Harry Truman announced a program to develop the hydrogen bomb; the first daytime soap opera, "These Are My Children," was broadcast on NBC; and Leon Trotsky was exiled from the Soviet Union. Famous birthdays include Jackie Robinson, Kerry Washington, and Justin Timberlake. January 31st also marks National Hot Chocolate Day.

We have 1 holiday listed for January 31.