Use the following code to get the scrollbar position as DayPilot.Date object using JavaScript (client side) in the Scheduler.
The horizontal scrollbar position can be detected using dps.getHScrollPosition() method.
var scrollX = dps.getHScrollPosition();
The first visible cell start time (DayPilot.Date object) can be extracted using dps.getDate() method:
var cellStart = dps.getDate(scrollX);
The exact time point can be extracted by adding a second parameter:
var scrollDateTime = dps.getDate(scrollX, true);
Controls: Scheduler