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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 was picked up for an upcoming 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 is announced for a 2nd season.
Heavy Iron Studios was founded.
September 11 "Nature Pants" and "Opposite Day" premiered.
September 17 "Sandy's Rocket" and "Squeaky Boots" premiered.
September 18 "Culture Shock" and "F.U.N." premiered.
September 24 "MuscleBob Buffpants" and "Squidward the Unfriendly Ghost" premiered.
October 16 "Help Wanted", "Reef Blower" and "Tea at the Treedome" premiered in India on Zee TV, thus marking the premiere of SpongeBob SquarePants in that country.
October 28 "Scaredy Pants" and "I Was a Teenage Gary" premiered.
November 7 "Jellyfishing" and "Plankton!" premiered in Latin America, thus marking the premiere of SpongeBob SquarePants in that country.
December 1 "Bubblestand" and "Ripped Pants" premiered in Latin America.
December 4 "Hall Monitor" and "Jellyfish Jam" premiered in Latin America.
December 14 "Help Wanted", "Reef Blower" and "Tea at the Treedome" premiered in Latin America.
December 16 "Naughty Nautical Neighbors" and "Boating School" premiered in Latin America.
December 23 "Pizza Delivery" and "Home Sweet Pineapple" premiered in Latin America.
December 28 "Mermaid Man and Barnacle Boy" and "Pickles" premiered in Latin America.
December 31 "SB-129" and "Karate Choppers" premiered.
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