when did i’m blue da ba dee come out

“Blue (Da Ba Dee)” by Eiffel 65 was released in two stages:

Initial Release: The song was first released in July 1998 in Italy. However, it didn’t gain widespread popularity at that time.

Global Success: The song’s breakthrough came in 1999 when it was released internationally. It quickly topped charts across Europe and reached number 6 on the Billboard Hot 100 in the United States.

So, while the song’s initial release was in 1998, it achieved its global success and became a worldwide hit in 1999.