def get_properties(dataset, property_offsets=None):
    """
    Extract properties and return values in a dictionary:
    {
      'properties':
      {
        'datetime': time,
        'odc:creation_datetime': creation_time,
        ...
      }
    }
    """
    props = dict()
    props['datetime'] = dataset.center_time
    props['odc:processing_datetime'] = dataset.indexed_time

    return {'properties': props}