def save_version_info(self, filename):
        """
        Materialize the value of date into the
        build tag. Install build keys in a deterministic order
        to avoid arbitrary reordering on subsequent builds.
        """
        egg_info = collections.OrderedDict()
        # follow the order these keys would have been added
        # when PYTHONHASHSEED=0
        egg_info['tag_build'] = self.tags()
        egg_info['tag_date'] = 0
        edit_config(filename, dict(egg_info=egg_info))

        Materialize the value of date into the
        build tag. Install build keys in a deterministic order
        to avoid arbitrary reordering on subsequent builds.
        
product/gradle-plugin/src/main/python/setuptools/command/egg_info.py