This could be implemented also in the RadTimeBar control.

Here is a sample implementation of the new method:

private Point ConvertDateTimeToPoint(DateTime dateTime, RadTimeBar timeBar)
{
    var periodStart = timeBar.VisiblePeriodStart;
    var periodEnd = timeBar.VisiblePeriodEnd;
    TimeSpan period = periodEnd - periodStart;


    var visibleTimeArea = this.timeBar.ActualWidth;
    var ticks = (dateTime - periodStart).Ticks;


    var pixelsPerTick = visibleTimeArea / period.Ticks;
    var x = ticks * pixelsPerTick;


    return new Point(x, 0);
}