Is there a simple function for rounding a DateTime down to the nearest 30 minutes, in C#?

by 
DateTime RoundDown(DateTime dt, TimeSpan d)
{
    return new DateTime((dt.Ticks / d.Ticks) * d.Ticks);
}

Example:

var dt1 = RoundDown(DateTime.Parse("2011-08-11 16:59"), TimeSpan.FromMinutes(30));
// dt1 == {11/08/2011 16:30:00}

var dt2 = RoundDown(DateTime.Parse("2011-08-11 17:00"), TimeSpan.FromMinutes(30));
// dt2 == {11/08/2011 17:00:00}

var dt3 = RoundDown(DateTime.Parse("2011-08-11 17:01"), TimeSpan.FromMinutes(30));
// dt3 == {11/08/2011 17:00:00}

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