c# round datetime
public enum eRoundingDirection { up, down, nearest }
public DateTime RoundDateTime(DateTime dt, int minutes, eRoundingDirection direction)
{
TimeSpan t;
switch (direction)
{
case eRoundingDirection.up:
t = (dt.Subtract(DateTime.MinValue)).Add(new TimeSpan(0, minutes, 0)); break;
case eRoundingDirection.down:
t = (dt.Subtract(DateTime.MinValue)); break;
default:
t = (dt.Subtract(DateTime.MinValue)).Add(new TimeSpan(0, minutes / 2, 0)); break;
}
return DateTime.MinValue.Add(new TimeSpan(0,
(((int)t.TotalMinutes) / minutes) * minutes, 0));
}