[release/5.0] Fix Activity Start Time Precision (#45176)

github-actions[bot] · tarekgh · web-flow · commit 65a4f7139fd0 · 2020-11-24T20:45:22.000-08:00
Co-authored-by: Tarek Mahmoud Sayed &lt;tarekms@microsoft.com&gt;
diff --git a/src/libraries/System.Diagnostics.DiagnosticSource/src/System/Diagnostics/Activity.cs b/src/libraries/System.Diagnostics.DiagnosticSource/src/System/Diagnostics/Activity.cs
@@ -1017,7 +1017,7 @@ internal static Activity CreateAndStart(ActivitySource source, string name, Acti
                 }
             }
 
-            activity.StartTimeUtc = startTime == default ? DateTime.UtcNow : startTime.UtcDateTime;
+            activity.StartTimeUtc = startTime == default ? GetUtcNow() : startTime.UtcDateTime;
 
             activity.IsAllDataRequested = request == ActivitySamplingResult.AllData || request == ActivitySamplingResult.AllDataAndRecorded;
 

Original file line number	Diff line number	Diff line change
`@@ -1017,7 +1017,7 @@ internal static Activity CreateAndStart(ActivitySource source, string name, Acti`
`1017`	`1017`	`}`
`1018`	`1018`	`}`
`1019`	`1019`
`1020`		`- activity.StartTimeUtc = startTime == default ? DateTime.UtcNow : startTime.UtcDateTime;`
	`1020`	`+ activity.StartTimeUtc = startTime == default ? GetUtcNow() : startTime.UtcDateTime;`
`1021`	`1021`
`1022`	`1022`	`activity.IsAllDataRequested = request == ActivitySamplingResult.AllData \|\| request == ActivitySamplingResult.AllDataAndRecorded;`
`1023`	`1023`