Prime Time is a current affairs programme airing on RTÉ One on Monday (22.30) and Tuesday and Thursday nights (following the RTÉ Nine O'Clock News).First broadcast on RTÉ One in 1992, Miriam O'Callaghan has been its main presenter for over fifteen years. O'Callaghan's fellow presenters are Claire Byrne and David McCullagh. Only one show per week is broadcast during the summer months.