Change the modified time for all the files in a directory based on the timestamp present in the filename

modified_time_modifier.py

# Script to change the last modified time of files
 
import os
import glob
import datetime 
import time 
from datetime import datetime
import re 
# String to datetime object  http://strftime.org/

file_date = lambda x : x.split("_")[1].split(".")[0]
get_file_cre_dt = lambda x : datetime.strptime(x,'%Y-%m-%d-%H-%M-%S-%f')


'''for i,name in enumerate(glob.glob('/media/umesh/NOSTALGIA/ush/Screenshot*')):
    stinfo = os.stat(name)
    #print "{}: {} -- {} ".format(name,stinfo.st_atime,datetime.utcfromtimestamp(stinfo.st_atime))
    file_creation_ts = long(get_file_cre_dt(file_date(name)).strftime('%s'))
    
    #print "{}  {} {} ::: {} -- {} ".format(name.split("/")[-1], get_file_cre_dt(file_date(name)) , file_creation_ts  , stinfo.st_mtime,datetime.utcfromtimestamp(stinfo.st_mtime))
    
    #os.utime(name,(file_creation_ts,file_creation_ts))
''' 



def folder_change_modif_time(folderpath,filename_pattern,get_date_from_filename,date_formatter):
  
    for name in glob.glob( folderpath + filename_pattern ) :
        filename = os.path.basename(name)
        #file_creation_ts = long(  date_formatter(get_date_from_filename(filename)).strftime('%s'))
        
        try:
            file_creation_ts = date_formatter(get_date_from_filename(filename)) 
            # Need to do this handle windows issue with strftime('%s') 
            file_ts_unix_fmt = long(time.mktime(file_creation_ts.timetuple()))
        except Exception as ex:
            print ex, name +" modification time can not modified as I can't get proper timestamp" 
        
        print filename,file_ts_unix_fmt
        os.utime(name, (file_ts_unix_fmt,file_ts_unix_fmt))
        

folder_change_modif_time('/media/umesh/NOSTALGIA/Screenshots/','Screenshot*',file_date,get_file_cre_dt)