March 31 is the 90th day of the year (91st in leap years) in the Gregorian calendar. There are 275 days remaining.
- 1980: Kate Micucci was born.
- 2007: "Born to Be Wild" and "Best Frenemies" premiered.
- 2012: "Are You Happy Now" and "Planet of the Jellyfish" premiered.
- 2014: "SpongeBob You're Fired" premiered in Southeast Asia.
- The SpongeBob Movie: Sponge Out of Water soundtrack was released on CD.
- Australia 1 and Australia 2 premiered.
- "The Krusty Sponge" premiered in Wales (UK).
- 2019: "Mustard O' Mine" and "Shopping List" premiered in Ukraine.
- 2020: The Complete Eleventh Season, The SpongeBob Movie: Sponge on the Run: The Junior Novelization, The Great Gary Rescue!, Happy Campers!, Welcome to Camp Coral!, and The SpongeBob Movie: Sponge on the Run: Official Activity Book were released.
- March 31 on Wikipedia
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