ate.year, date.month)
        if not date.month == 12:
            next = &#34;RP%s%02d.gbl&#34; % (date.year, date.month + 1)
        else:
            next = &#34;RP%s%02d.gbl&#34; % (date.year + 1, date.month - 11)

        if not date.month == 1:
            prev = &#34;RP%s%02d.gbl&#34; % (date.year, date.month - 1)
        else:
            prev = &#34;RP%s%02d.gbl&#34; % (date.year - 1, date.month - 1 + 12)
        return [curr, prev, next]

    @staticmethod
    def get_old_ncep_metfiles(date):
    