Tijden afronden

Code

public static DateTime RoundUp(this DateTime dt, TimeSpan d)
        {
            var delta = (d.Ticks - (dt.Ticks % d.Ticks)) % d.Ticks;
            return new DateTime(dt.Ticks + delta);
        }

        public static DateTime RoundDown(this DateTime dt, TimeSpan d)
        {
            var delta = dt.Ticks % d.Ticks;
            return new DateTime(dt.Ticks - delta);
        }

        public static DateTime RoundToNearest(this DateTime dt, TimeSpan d)
        {
            var delta = dt.Ticks % d.Ticks;
            bool roundUp = delta > d.Ticks / 2;

            return roundUp ? dt.RoundUp(d) : dt.RoundDown(d);
        }