‎SharePoint All day events email show the wrong hours‎

Hi - when a new event is created in a SharePoint Online calendar we have a workflow to send these details to a user which shows the start and end times. This works correctly unless the user creating the item ticks "all day event" then it shows the wrong hours. It isn't a timezone issue or when they make the event only a few hours they would be wrong there as well but they aren't. It is only an issue when they click 'all day event'.

Any ideas?

Thanks