update tests to use string UTC format instead of iso

test/unit/app/managers/test_markdown_export.py

@@ -280,7 +280,8 @@ def test_generate_invocation_time(self):
         invocation = self._new_invocation()
         self.app.workflow_manager.get_invocation.side_effect = [invocation]  # type: ignore[attr-defined,union-attr]
         result = self._to_basic(example)
-        assert f"\n    {invocation.create_time.isoformat()}" in result
+        expectedtime = invocation.create_time.strftime("%m/%d/%Y, %H:%M:%S")
+        assert f"\n    {expectedtime}" in result
 
     def test_job_parameters(self):
         job = model.Job()
@@ -412,7 +413,7 @@ def test_get_invocation_time(self):
         result, extra_data = self._ready_export(example)
         assert "invocations" in extra_data
         assert "create_time" in extra_data["invocations"]["be8be0fd2ce547f6"]
-        assert extra_data["invocations"]["be8be0fd2ce547f6"]["create_time"] == invocation.create_time.isoformat()
+        assert extra_data["invocations"]["be8be0fd2ce547f6"]["create_time"] == invocation.create_time.strftime("%m/%d/%Y, %H:%M:%S")
 
     def _ready_export(self, example):
         return ready_galaxy_markdown_for_export(self.trans, example)