PDT and MST are the same time all year long, as far as I know, so there's no effective difference. I suppose this means that other places in Pacific time that h

PDT and MST are the same time all year long, as far as I know, so there's no effective difference. I suppose this means that other places in Pacific time that have DST part of the year would be on the same labeled time zone as California part of the year for cultural and historical reasons.