Script to update file modification and access times. Unfortunately, does not update file creation time.

modtime.py

#!/usr/bin/python

import sys
import os
import time

from datetime import datetime

def modtime(path):
    print path
    if not os.path.isfile(path):
        print "\tFile doesn't exist"
        return

    # Get the file's current mtime
    mtime = os.stat(path).st_mtime

    # Parse the mtime into a datetime instance
    dt = datetime.fromtimestamp(os.stat(path).st_mtime)

    # Mutate the datetime
    ndt = dt.replace(year=dt.year - 1)

    # Convert the datetime to a timestamp that works with utime
    timestamp = time.mktime(ndt.timetuple())

    # Update the file with the new timestamp
    os.utime(path, (timestamp, timestamp))
    print "\tOld: %s" % dt
    print "\tNew: %s" % ndt


def main():
    """
    Usage:
    ./modtime.py /Dropbox/Photos/sony/100MSDCF/DSC0{1633..1872}.JPG
    """

    paths = sys.argv[1:]
    for p in paths:
        modtime(p)

    
if __name__ == "__main__":
    try:
        sys.exit(main())
    except KeyboardInterrupt:
        sys.exit()