def pre_save_handler(sender, instance, **kwargs):
    """
    Intercept attempts to save and insert the current date and time into
    creation and modification date fields.
    """
    now = timezone.now()
    if instance.id is None:
        instance.creation_date = now
    instance.modification_date = now

    Intercept attempts to save and insert the current date and time into
    creation and modification date fields.
    
feincms/extensions/changedate.py