Untitled

Iterate through hours in a day
DateTime testDate = new DateTime(2011,12,15,00,00,00);

foreach (int myHour in testDate.Date)
{

}

DateTime testDate = new DateTime(2011, 12, 15, 00, 00, 00, DateTimeKind.Local);
DateTime endDate = testDate.AddDays(1);

while (testDate.Date != endDate.Date)
{
    Console.WriteLine(testDate.ToString());
    testDate = testDate.AddHours(1);
}

DateTime date = new DateTime(2011,12,15);
for(int i = 0; i < 24; i++)
{
    DateTime time = date.AddHours(i);
    ...
}

static class DateTimeExtensions
{
    public static IEnumerable<DateTime> GetHours(this DateTime date)
    {
        date = date.Date; // truncate hours
        for(int i = 0; i < 24; i++)
        {
            yield return date.AddHours(i);
        }
    }
}

...

DateTime date = new DateTime(2011,12,15);
foreach (DateTime time in date.GetHours())
{
    ...
}

DateTime testDate = new DateTime(2011,12,15,00,00,00);
foreach (int hour in Enumerable.Range(0,24)) {
    DateTime dateWithHour = testDate.AddHours(hour);
}

DateTime testDate = new DateTime(2011, 12, 15);

for (int i = 0; i < 24; i++)
{
    DateTime hour = testDate.Date.AddHours(i);
    // Your code here
}

DateTime testDate = new DateTime(2011,12,15,13,00,00);
var hoursLeft = 24 - testDate.Hour;

for (var hour = 1; hour < hoursLeft; hour++)
{
    var nextDate = testDate.AddHours(hour);
    Console.WriteLine(nextDate);
}

DateTime testDate = new DateTime(2011, 12, 15, 10, 00, 00);
        for (int i = testDate.Hour; i < 24; i++)
        {
            //do what ever

        }