Year 1999 (MCMXCIX) was a common year of the Gregorian calendar that started on a Friday. It is the first year of SpongeBob SquarePants and the year of season 1.

Date Event(s)
May 1 "Help Wanted," "Reef Blower," and "Tea at the Treedome," the pilot episodes, premiered.
The show premiered.
July 17 "Bubblestand" and "Ripped Pants" premiered.
The show officially began.
July 31 "Jellyfishing" and "Plankton!" premiered.
August 7 "Naughty Nautical Neighbors" and "Boating School" premiered.
August 11 SpongeBob SquarePants got picked up for a 2nd season.
August 14 "Pizza Delivery" and "Home Sweet Pineapple" premiered.
August 21 "Mermaid Man and Barnacle Boy" and "Pickles" premiered.
August 28 "Hall Monitor" and Jellyfish Jam premiered.
August 31 SpongeBob SquarePants gets picked up for a 2nd season.
September 4 "Sandy's Rocket" and "Squeaky Boots" premiered.
September 11 "Nature Pants" and "Opposite Day" premiered.
September 18 "Culture Shock" and "F.U.N." premiered.
Nicktoons Racing was released.
September 25 "MuscleBob BuffPants" and "Squidward the Unfriendly Ghost" premiered.
October 2 "The Chaperone" and "Employee of the Month" premiered.
October 28 "Scaredy Pants" and "I Was a Teenage Gary" premiered.
December 31 "SB-129" and "Karate Choppers" premiered.
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