diff --git a/Microsoft.Azure.Cosmos/src/Tracing/TraceWriter.TraceJsonWriter.cs b/Microsoft.Azure.Cosmos/src/Tracing/TraceWriter.TraceJsonWriter.cs
index 4710f00a2e..74363c8ca1 100644
--- a/Microsoft.Azure.Cosmos/src/Tracing/TraceWriter.TraceJsonWriter.cs
+++ b/Microsoft.Azure.Cosmos/src/Tracing/TraceWriter.TraceJsonWriter.cs
@@ -46,8 +46,8 @@ public static void WriteTrace(
if (isRootTrace)
{
- writer.WriteFieldName("start time");
- writer.WriteStringValue(trace.StartTime.ToString(TraceWriter.HourTimeFormatString));
+ writer.WriteFieldName("start datetime");
+ writer.WriteStringValue(trace.StartTime.ToString(TraceWriter.DateTimeFormatString));
}
writer.WriteFieldName("duration in milliseconds");
writer.WriteNumber64Value(trace.Duration.TotalMilliseconds);
diff --git a/Microsoft.Azure.Cosmos/src/Tracing/TraceWriter.TraceTextWriter.cs b/Microsoft.Azure.Cosmos/src/Tracing/TraceWriter.TraceTextWriter.cs
index f77307b359..502c87c4fe 100644
--- a/Microsoft.Azure.Cosmos/src/Tracing/TraceWriter.TraceTextWriter.cs
+++ b/Microsoft.Azure.Cosmos/src/Tracing/TraceWriter.TraceTextWriter.cs
@@ -18,6 +18,7 @@ namespace Microsoft.Azure.Cosmos.Tracing
internal static partial class TraceWriter
{
internal static readonly string HourTimeFormatString = "HH:mm:ss:fff";
+ internal static readonly string DateTimeFormatString = "yyyy-MM-ddTHH:mm:ss.fffZ";
private static class TraceTextWriter
{
diff --git a/Microsoft.Azure.Cosmos/tests/Microsoft.Azure.Cosmos.EmulatorTests/BaselineTest/TestBaseline/EndToEndTraceWriterBaselineTests.BatchOperationsAsync.xml b/Microsoft.Azure.Cosmos/tests/Microsoft.Azure.Cosmos.EmulatorTests/BaselineTest/TestBaseline/EndToEndTraceWriterBaselineTests.BatchOperationsAsync.xml
index 59a5eabf76..d468fe87f5 100644
--- a/Microsoft.Azure.Cosmos/tests/Microsoft.Azure.Cosmos.EmulatorTests/BaselineTest/TestBaseline/EndToEndTraceWriterBaselineTests.BatchOperationsAsync.xml
+++ b/Microsoft.Azure.Cosmos/tests/Microsoft.Azure.Cosmos.EmulatorTests/BaselineTest/TestBaseline/EndToEndTraceWriterBaselineTests.BatchOperationsAsync.xml
@@ -61,7 +61,7 @@
@@ -71,7 +71,7 @@