Calculate how many hours until 8 AM

Question

I know how to calculate the difference between two dates, but how do I calculate the time between a given date and the next 8 AM?

Answer 1

var now = DateTime.Now;
var tomorrow8am = now.AddDays(1).Date.AddHours(8);
double totalHours = ( tomorrow8am - now).TotalHours;

Answer 2

var now = DateTime.Now;
double diffHours = 24 - (now - now.Date).TotalHours + 8;