Question

I have the following Code:

var enteredDate = Convert.ToDateTime("17:45");
var todaysDateTime = DateTime.Now;
var span = enteredDate.Subtract(todaysDateTime);
double totalMins = Math.Ceiling(span.TotalMinutes);

string timeCond;
if (totalMins > 0)
{
   if (totalMins < 5)
   {
     timeCond = Math.Ceiling(span.TotalSeconds) + " seconds left.";
   }
   else
   {
     timeCond = totalMins + " minutes left.";
   }

}

Given that the time now would be 17:50 the returned second would be a negative figure, I would like to be able to return the seconds or minutes in relation to the code for the next time the time would be 17:45, is this possible?

Answer 1

You could always just add a day:

var span = enteredDate - todaysDateTime;
if (span < TimeSpan.Zero)
{
    span += TimeSpan.FromDays(1);
}

(Note that this assumes there are 24 hours between today’s 17:45 and tomorrow’s 17:45. That isn’t true around daylight saving transitions; accommodating for that is feasible, but would make life somewhat more complicated.)