Answered: This tutorial required DayPilot Pro (the commercial version). It looks like you are using DayPilot Lite (the open-source version) which doesn't support all the features (e.g. SetScrollX() method).
Answered: DayPilotScheduler1.VisibleStart is a DateTime object so you can get a custom formatted string from it using ToString(): DayPilotScheduler1.VisibleStart.ToString("yyyy-MM-dd"); See also here: https://...