- The U.S. Congress establishes time zones and Daylight Saving Time goes into effect.
- Russia switches from the Julian calendar to the Gregorian calendar; the date skips from February 1 to February 14.
- The Spanish Flu (influenza) becomes pandemic; over 30 million people die.
- The last captive Carolina Parakeet (the last breed of parrot native to North America) dies at the Cincinnati Zoo.
- Moscow becomes the capital of Soviet Russia.
- "The Red Baron", WWI's most successful fighter pilot, dies in combat.
Historical Highlights from 1918