How to add current date to product label report?

How do I add the current date to the product label report? Notes: - I have tried to alter the product_label.xml file by adding a line like this: > - But, then I get the following error when executing the print label action: > name 'datetime' is not defined (type 'exceptions.NameError', NameError("name 'datetime' is not defined",), traceback object at 0x7f6024a70fc8) Any help would be appreciated. -Thx