Smallville first premiered at 9:00 PM on Tuesday, October 16, 2001 on The WB. For the next five seasons the series was featured on The WB, transitioning from Tuesday nights at 9:00 pm to Wednesday nights at 8:00 pm, and eventually settling on Thursday nights at 8:00 pm. In 2006, before the start of Smallville's sixth season, it was announced The WB and UPN would be merging into a single entity, The CW. Shortly after that, The CW announced Smallville would continue to be part of the television lineup. On May 21, 2009, it was announced Smallville would be returning to the 2009–2010 fall line-up for its ninth season, airing on Friday nights at 8:00 pm. On March 4, 2010, the CW announced Smallville had been renewed for a tenth season. Smallville also airs in Canada; during its seventh season the series aired one day earlier than United States airing.