def get_date(date_string):
    d=None
    try:
        d=datetime.datetime.strptime(date_string, "%d %B %Y").date()
    except:
        d=datetime.datetime.strptime(date_string, "%Y-%m-%d").date()

    if d:
        return d.strftime("%Y-%m-%d")
    else:
        return date_string