format dates when produced by to_datetime proesing fucntion

tcex/api/tc/ti_transform/ti_predefined_functions.py

@@ -163,7 +163,7 @@ def format_table(self, value, column_order: str):
 
     def any_to_datetime(self, value):
         """Convert any value to a datetime object."""
-        return self.tcex.util.any_to_datetime(value)
+        return self.tcex.util.any_to_datetime(value).isoformat()
 
     def append(self, value, suffix: str):
         """Append a value to the input value."""