def standard(timezones):
    """
    Given a list of timezones (either strings of timezone objects),
    return a list of choices with
        * values equal to what was passed in
        * display strings as the timezone name without underscores
    """
    choices = []
    for tz in timezones:
        tz_str = str(tz)
        choices.append((tz, tz_str.replace('_', ' ')))
    return choices