ArcGIS Pro 3.4 API Reference Guide
ArcGIS.Desktop.Mapping Namespace / TimeRange Class / Start Property
Example Version

Start Property (TimeRange)
Gets or sets the start time for the range.
Syntax
public Nullable<DateTime> Start {get; set;}
Example
Disable time in the map.
MapView.Active.Time.Start = null;
MapView.Active.Time.End = null;
Requirements

Target Platforms: Windows 11, Windows 10

ArcGIS Pro version: 3 or higher.
See Also