fix: Setting StartTime in TransactionTracer

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## Unreleased
 
+### Fixes
+
+- The SDK no longer creates transactions with their start date set to `Jan 01, 001` ([#2544](https://github.com/getsentry/sentry-dotnet/pull/2544))
+
 ### Dependencies
 
 - Bump CLI from v2.20.4 to v2.20.5 ([#2539](https://github.com/getsentry/sentry-dotnet/pull/2539))

src/Sentry/TransactionTracer.cs

@@ -234,6 +234,7 @@ internal TransactionTracer(IHub hub, ITransactionContext context, TimeSpan? idle
         Description = context.Description;
         Status = context.Status;
         IsSampled = context.IsSampled;
+        StartTimestamp = _stopwatch.StartDateTimeOffset;
 
 		if (context is TransactionContext transactionContext)
         {

test/Sentry.Tests/Protocol/TransactionTests.cs

@@ -9,6 +9,57 @@ public TransactionTests(ITestOutputHelper output)
         _testOutputLogger = new TestOutputDiagnosticLogger(output);
     }
 
+    [Fact]
+    public void NewTransactionTracer_ConstructingWithNameAndOperation_HasValidStartTime()
+    {
+        var actualTransaction = new TransactionTracer(DisabledHub.Instance, "test-name", "test-operation");
+
+        Assert.NotEqual(DateTimeOffset.MinValue, actualTransaction.StartTimestamp);
+    }
+
+    [Fact]
+    public void NewTransactionTracer_ConstructingWithContext_HasValidStartTime()
+    {
+        var context = new TransactionContext("test-name", "test-operation");
+
+        var actualTransaction = new TransactionTracer(DisabledHub.Instance, context);
+
+        Assert.NotEqual(DateTimeOffset.MinValue, actualTransaction.StartTimestamp);
+    }
+
+    [Fact]
+    public async Task NewTransactionTracer_IdleTimeoutProvided_AutomaticallyFinishes()
+    {
+        // Arrange
+        var client = Substitute.For<ISentryClient>();
+        var options = new SentryOptions
+        {
+            Dsn = ValidDsn,
+            Debug = true
+        };
+        var hub = new Hub(options, client);
+        var context = new TransactionContext(
+            SpanId.Create(),
+            SpanId.Create(),
+            SentryId.Create(),
+            "my name",
+            "my operation",
+            "description",
+            SpanStatus.Ok,
+            null,
+            true,
+            TransactionNameSource.Component
+        );
+
+        var transaction = new TransactionTracer(hub, context, TimeSpan.FromMilliseconds(2));
+
+        // Act
+        await Task.Delay(TimeSpan.FromSeconds(2));
+
+        // Assert
+        transaction.IsFinished.Should().BeTrue();
+    }
+
     [Fact]
     public void Redact_Redacts_Urls()
     {
@@ -561,38 +612,4 @@ public void ISpan_GetTransaction_FromSpan()
         // Assert
         Assert.Same(transaction, result);
     }
-
-    [Fact]
-    public async Task NewTransactionTracer_IdleTimeoutProvided_AutomaticallyFinishes()
-    {
-        // Arrange
-        var client = Substitute.For<ISentryClient>();
-        var options = new SentryOptions
-        {
-            Dsn = ValidDsn,
-            Debug = true
-        };
-        var hub = new Hub(options, client);
-        var context = new TransactionContext(
-            SpanId.Create(),
-            SpanId.Create(),
-            SentryId.Create(),
-            "my name",
-            "my operation",
-            "description",
-            SpanStatus.Ok,
-            null,
-            true,
-            TransactionNameSource.Component
-        );
-
-        var transaction = new TransactionTracer(hub, context, TimeSpan.FromMilliseconds(2));
-
-        // Act
-        await Task.Delay(TimeSpan.FromSeconds(2));
-
-        // Assert
-        transaction.IsFinished.Should().BeTrue();
-    }
-
 }