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):
        mons = [
            &#34;jan&#34;,
            &#34;feb&#34;,
            &#34;mar&#34;,
            &#34;apr&#34;,
            &#34;may&#34;,
            &#34;jun&#34;,
            &#34;jul&#34;,
            &#34;aug&#34;,
 