def METHOD_NAME(self, day):
    if re.search("-", day):
        days = day.split("-")
        osm_days = []
        if len(days) == 2:
            for day in days:
                osm_day = day.strip()[:2]
                osm_days.append(osm_day)
        return "-".join(osm_days)
    if re.search("Every Day", day):
        return "Mo-Su"
    return day.strip()[:2]