Convert CreationTime of PDF to a readable format in Python

Is "+01'00'" the timezone information? Not taking that into account, you can create a datetime object as follows...

>>>from time import mktime, strptime
>>>from datetime import datetime
...
>>>datestring = doc.info[0]['CreationDate'][2:-7]
>>>ts = strptime(datestring, "%Y%m%d%H%M%S")
>>>dt = datetime.fromtimestamp(mktime(ts))
datetime(2013, 5, 1, 20, 4, 30)

I found the format documented here. I needed to cope with the timezones too because I have 160k documents from all over to deal with. Here is my full solution:

import datetime
import re
from dateutil.tz import tzutc, tzoffset


pdf_date_pattern = re.compile(''.join([
    r"(D:)?",
    r"(?P<year>\d\d\d\d)",
    r"(?P<month>\d\d)",
    r"(?P<day>\d\d)",
    r"(?P<hour>\d\d)",
    r"(?P<minute>\d\d)",
    r"(?P<second>\d\d)",
    r"(?P<tz_offset>[+-zZ])?",
    r"(?P<tz_hour>\d\d)?",
    r"'?(?P<tz_minute>\d\d)?'?"]))


def transform_date(date_str):
    """
    Convert a pdf date such as "D:20120321183444+07'00'" into a usable datetime
    http://www.verypdf.com/pdfinfoeditor/pdf-date-format.htm
    (D:YYYYMMDDHHmmSSOHH'mm')
    :param date_str: pdf date string
    :return: datetime object
    """
    global pdf_date_pattern
    match = re.match(pdf_date_pattern, date_str)
    if match:
        date_info = match.groupdict()

        for k, v in date_info.iteritems():  # transform values
            if v is None:
                pass
            elif k == 'tz_offset':
                date_info[k] = v.lower()  # so we can treat Z as z
            else:
                date_info[k] = int(v)

        if date_info['tz_offset'] in ('z', None):  # UTC
            date_info['tzinfo'] = tzutc()
        else:
            multiplier = 1 if date_info['tz_offset'] == '+' else -1
            date_info['tzinfo'] = tzoffset(None, multiplier*(3600 * date_info['tz_hour'] + 60 * date_info['tz_minute']))

        for k in ('tz_offset', 'tz_hour', 'tz_minute'):  # no longer needed
            del date_info[k]

        return datetime.datetime(**date_info)