The penultimate phase of the competition will be spread over five consecutive days, starting on Sunday, May 6.
The first semi-final will run for two hours. Subsequent semi-finals will be one and a half hours with a separate half-hour results show.
Each day will feature nine acts performing live for judges Simon Cowell, Alesha Dixon, Amanda Holden and David Walliams.
The home viewers will choose which acts make the final and the chance to win a slot on the Royal Variety Performance and £500,000
The full semi-final details are as follows:
Semi-final 1 - Sunday, May: 6 8pm-10pm
Semi-final 2 - Monday, May 7: 7.30pm-9pm (results 9.30pm-10pm)
Semi-final 3 - Tuesday, May 8 7.30pm-9pm (results 9.30pm-10pm)
Semi-final 4 - Wednesday, May 9: 7.30pm-9pm (results 9.30pm-10pm)
Semi-final 5 - Thursday, May 10: 7.30pm-9pm (results 9.30pm-10pm)
The Final - TBC
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Photo gallery - 'Britain's Got Talent' episode five: