Excellent.. You saved me today! Great product Dan..
Example for others..
protected void DayPilotScheduler1_BeforeTimeHeaderRender(object sender, DayPilot.Web.Ui.Events.BeforeTimeHeaderRenderEventArgs e)
{
if (e.IsColGroup)
{
e.InnerHTML = "Week " + BizLogic.GetWMWeek(e.Start, true) + " ("+e.Start.ToString("MMMM yyyy") + ")"; // sets the group header
}
}