When did tomorrowland start?

Tomorrowland began on August 14, 2005, according to some sources, while others state it started on August 15, 2005, reflecting some discrepancy in the exact date^[1][3]. In any case, it commenced in 2005 when brothers Manu and Michiel Beers conceptualized the festival, which was held in Boom, Belgium^[2][4][6].