Fix timezone-dependent ArgumentOutOfRangeException in WorkflowState

src/Dapr.Workflow/WorkflowState.cs

@@ -31,7 +31,7 @@ internal WorkflowState(WorkflowMetadata? metadata)
     {
         _metadata = metadata;
     }
-    
+
     /// <summary>
     /// Gets a value indicating whether the requested workflow instance exists.
     /// </summary>
@@ -53,12 +53,16 @@ WorkflowRuntimeStatus.Failed or
     /// <summary>
     /// Gets the time at which this workflow instance was created.
     /// </summary>
-    public DateTimeOffset CreatedAt => _metadata?.CreatedAt ?? default;
+    public DateTimeOffset CreatedAt => _metadata?.CreatedAt is { } dt && dt != default
+        ? new DateTimeOffset(DateTime.SpecifyKind(dt, DateTimeKind.Utc))
+        : default;
 
     /// <summary>
     /// Gets the time at which this workflow instance last had its state updated.
     /// </summary>
-    public DateTimeOffset LastUpdatedAt => _metadata?.LastUpdatedAt ?? default;
+    public DateTimeOffset LastUpdatedAt => _metadata?.LastUpdatedAt is { } dt && dt != default
+        ? new DateTimeOffset(DateTime.SpecifyKind(dt, DateTimeKind.Utc))
+        : default;
 
     /// <summary>
     /// Gets the execution status of the workflow.

test/Dapr.Workflow.Test/WorkflowStateTests.cs

@@ -56,11 +56,29 @@ public void Properties_ShouldReflectMetadata_WhenPresent()
         Assert.True(state.Exists);
         Assert.True(state.IsWorkflowRunning);
         Assert.False(state.IsWorkflowCompleted);
-        Assert.Equal(created, state.CreatedAt);
-        Assert.Equal(updated, state.LastUpdatedAt);
+        Assert.Equal(created, state.CreatedAt.DateTime);
+        Assert.Equal(updated, state.LastUpdatedAt.DateTime);
         Assert.Equal(WorkflowRuntimeStatus.Running, state.RuntimeStatus);
     }
 
+    [Fact]
+    public void CreatedAt_ShouldReturnDefault_WhenMetadataCreatedAtIsMinValue()
+    {
+        var serializer = new JsonWorkflowSerializer();
+        var metadata = new WorkflowMetadata(
+            InstanceId: "i",
+            Name: "wf",
+            RuntimeStatus: WorkflowRuntimeStatus.Running,
+            CreatedAt: DateTime.MinValue,
+            LastUpdatedAt: DateTime.MinValue,
+            Serializer: serializer);
+
+        var state = new WorkflowState(metadata);
+
+        Assert.Equal(DateTime.MinValue, state.CreatedAt.DateTime);
+        Assert.Equal(DateTime.MinValue, state.LastUpdatedAt.DateTime);
+    }
+
     [Theory]
     [InlineData(WorkflowRuntimeStatus.Completed)]
     [InlineData(WorkflowRuntimeStatus.Failed)]