<PackageReference Include="System.Reactive" Version="6.0.1-preview.1" />

System.Reactive.Concurrency.HistoricalScheduler

Provides a virtual time scheduler that uses DateTimeOffset for absolute time and TimeSpan for relative time.
namespace System.Reactive.Concurrency { public class HistoricalScheduler : HistoricalSchedulerBase { public HistoricalScheduler(); public HistoricalScheduler(DateTimeOffset initialClock); public HistoricalScheduler(DateTimeOffset initialClock, IComparer<DateTimeOffset> comparer); } }