a simply funtion for retain unzipfile timestamp.

zf.py

import os
import time
from zipfile import ZipFile


def unpack(filename, extract_dir=None):
    if not extract_dir:
        extract_dir = os.path.basename(filename).replace('.zip', '')
    with ZipFile(filename) as zf:
        for zi in zf.infolist():
            target = zf.extract(extract_dir)
            date_time = time.mktime(zi.date_time + (0,0,-1))
            os.utime(target, (date_time, date_time))
    return extract_dir