Rule reminder
Summary: 'Che ore sono?' and 'Che ora è?' both ask the time. 'A che ora?' asks when something happens. Use 'alle' for 'at [time]', 'dalle...alle' for 'from...to'. The 24-hour clock is used in formal/schedule contexts.
Which question asks 'at what time does X happen?' (not 'what time is it now?')