<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _update_nrfa_metadata(remote_config):
 """ Save NRFA metadata to local config file using retrieved config data :param remote_config: Downloaded JSON data, not a ConfigParser object! """

    config['nrfa']['oh_json_url'] = remote_config['nrfa_oh_json_url']
    config['nrfa']['version'] = remote_config['nrfa_version']
    config['nrfa']['url'] = remote_config['nrfa_url']
    config.set_datetime('nrfa', 'published_on', datetime.utcfromtimestamp(remote_config['nrfa_published_on']))
    config.set_datetime('nrfa', 'downloaded_on', datetime.utcnow())
    config.set_datetime('nrfa', 'update_checked_on', datetime.utcnow())
    config.save()