def convert_webaccess_datestamp(entry):
    """Set date and time attributes based on an iso date stamp"""
    attrlist = entry['date_stamp'].split('/')
    timelist = attrlist[-1].split(':')
    entry['year'] = timelist[0]
    months = {'Jan': '01', 'Feb': '02', 'Mar': '03',
            'Apr': '04', 'May': '05', 'Jun': '06',
            'Jul': '07', 'Aug': '08', 'Sep': '09',
            'Oct': '10', 'Nov': '11', 'Dec': '12'}
    entry['month'] = months[attrlist[1]]
    entry['day'] = attrlist[0]
    entry['tstamp'] = ''.join(timelist[1:])
    entry['numeric_date_stamp'] = entry['year'] + entry['month'] + \
            entry['day'] + entry['tstamp']

    return entry