def facebook_date_to_solr_date(date_string):
    """
    Convert a Facebook date in the format:  2014-05-01T16:14:37+0000
    to a Solr date in the format:           2014-05-01T16:14:37Z
    """
    # Then convert datetime to Solr format.
    return date_string.replace('+0000', 'Z')