Yes:
DateTime recentTime = new DateTime(2015, 9, 6);
DateTime exactTime = recentTime.AddHours(10).AddMinutes(30);
if (DateTime.Now >= exactTime)
{
...
}
Or
DateTime recentTime = new DateTime(2015, 9, 6);
DateTime exactTime = recentTime.AddMinutes(630);
if (DateTime.Now >= exactTime)
{
...
}