context: In 2001, EastEnders clashed with Coronation Street for the first time. EastEnders won the battle with 8.4 million viewers (41% share) whilst Coronation Street lagged behind with 7.3 million viewers (34 per cent share). On 21 September 2004, Louise Berridge, the then executive producer, quit following criticism of the show. The following day the show received its lowest ever ratings at that time (6.2 million) when ITV scheduled an hour-long episode of Emmerdale against it. Emmerdale was watched by 8.1 million people. The poor ratings motivated the press into reporting viewers were bored with implausible and ill-thought-out storylines. Under new producers, EastEnders and Emmerdale continued to clash at times, and Emmerdale tended to come out on top, giving EastEnders lower than average ratings. In 2006, EastEnders regularly attracted between 8 and 12 million viewers in official ratings. EastEnders received its second lowest ratings on 17 May 2007, when 4.0 million viewers tuned in. This was also the lowest ever audience share, with just 19.6 per cent. This was attributed to a conflicting one-hour special episode of Emmerdale on ITV1. However, ratings for the 10pm EastEnders repeat on BBC Three reached an all-time high of 1.4 million. However, there have been times when EastEnders had higher ratings than Emmerdale despite the two going head-to-head.
question: What date did EastEnders have it lowest rating of 2004?
answer: 22 September 2004