script to adjust access and modification time based on the filename

time_adjuster.py

import os
import glob
import re
import datetime as dt
from stat import *


if __name__ == '__main__':
    regexp = re.compile("(\d{4}\d{2}\d{2}_\d{2}\d{2}\d{2})")
    for file in glob.iglob("*.jpg"):
        timestring = regexp.search(file).group(0)
        datetime_object = dt.datetime.strptime( timestring, '%Y%m%d_%H%M%S')
        st = os.stat(file)
        atime = st[ST_ATIME] #access time
        mtime = st[ST_MTIME] #modification time

        new_mtime = int(datetime_object.strftime('%s')) #new modification time
        new_atime = new_mtime

        #modify the file timestamp
        os.utime(file,(new_atime,new_mtime))