From fe80a77dac16de2451be60563123b8fbf8ea8355 Mon Sep 17 00:00:00 2001
From: Tarek Mahmoud Sayed <tarekms@microsoft.com>
Date: Tue, 24 Nov 2020 20:44:54 -0800
Subject: [PATCH] Fix Activity Start Time Precision (#45175)

---
 .../src/System/Diagnostics/Activity.cs                          | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/libraries/System.Diagnostics.DiagnosticSource/src/System/Diagnostics/Activity.cs b/src/libraries/System.Diagnostics.DiagnosticSource/src/System/Diagnostics/Activity.cs
index 50823c0f6ba77..38351198a340f 100644
--- 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 @@ public void SetCustomProperty(string propertyName, object? propertyValue)
                 }
             }
 
-            activity.StartTimeUtc = startTime == default ? DateTime.UtcNow : startTime.UtcDateTime;
+            activity.StartTimeUtc = startTime == default ? GetUtcNow() : startTime.UtcDateTime;
 
             activity.IsAllDataRequested = request == ActivitySamplingResult.AllData || request == ActivitySamplingResult.AllDataAndRecorded;