date_range_sep = '-'

date_range_date_part_sep = ' '

def _dateRangePart(items):

    items = dict(conv_items(str, items))

    try:

        part = items['part']

        value = items['value']

    except KeyError, e: raise SyntaxException(e)

    value = value.strip()

    if value.find(date_range_date_part_sep) < 0: return value

        # date_range_sep might be used as date part separator instead

    start, sep, end = value.partition(date_range_sep)

    if sep == '': return value # not a range

    start = start.split(date_range_date_part_sep)

    end = end.split(date_range_date_part_sep)

    #if len(end) < 3

    #if len(start) < len(end): # range 

funcs['_dateRangePart'] = _dateRangePart