feat: override ManualTimeProvider.ToString, returns GetUtcNow date time string

Author: egil

CHANGELOG.md

@@ -11,6 +11,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Changed ManualTestProvider sets the local time zone to UTC by default, provides method for overriding during testing.
 - Changed `ManualTestProvider` sets the local time zone to UTC by default, provides method for overriding during testing.
 
+- Changed `ManualTestProvider.ToString()` method to return current date time.
 ## [1.0.0-preview.1]
 
 This release adds a dependency on [Microsoft.Bcl.TimeProvider](https://www.nuget.org/packages/Microsoft.Bcl.TimeProvider) and utilizes the types built-in to that to do much of the work.

src/TimeProviderExtensions/ManualTimeProvider.cs

@@ -210,6 +210,13 @@ public void SetUtcNow(DateTimeOffset newUtcNew)
         }
     }
 
+    /// <summary>
+    /// Returns a string representation this clock's current time.
+    /// </summary>
+    /// <returns>A string representing the clock's current time.</returns>
+    public override string ToString()
+        => GetUtcNow().ToString("yyyy-MM-ddTHH:mm:ss.fff", CultureInfo.InvariantCulture);
+
     private void ScheduleCallback(ManualTimer timer, TimeSpan waitTime)
     {
         lock (futureCallbacks)