Rename all files in directory with modification date

mdate_renamer.py

from os import listdir, rename
from os.path import isfile, join, getmtime, splitext
from time import gmtime, strftime

pathToFiles = "E:/test"
nameFormat = "%d%m%Y_%H%M%S"
files = [f for f in listdir(pathToFiles) if isfile(join(pathToFiles, f))]

for f in files:
    originFullPath = join(pathToFiles, f)
    originFileName, fileExtension = splitext(f)
    createdTime = getmtime(originFullPath)
    newFileName = strftime(nameFormat, gmtime(createdTime)) + fileExtension
    newFullPath = join(pathToFiles, newFileName)
    rename(originFullPath, newFullPath)