Formatting text inside the cells

The text can be customized using BeforeEventRender event handler. This event is fired once for each event in the DataSource. You can set custom HTML by changing e.InnerHTML property:

protected void DayPilotCalendar1_BeforeEventRender(object sender, BeforeEventRenderEventArgs e)
{
  e.InnerHTML = e.Text + " " + e.Start.ToShortTimeString();
}