modification time in Python - Django: datetime != datetime :-(

[Jaap van Wingerde]

Django views.py:
....
pwd = os.path.dirname(os.path.realpath(__file__ ))
home_lastmod = strftime('%Y-%m-%dT%H:%m:%SZ',gmtime(os.path.getmtime(pwd+'/templates/art_index.html')))
....

The template gives a wrong modification time: "2014-03-02T19:03:55Z".

....
jaap@liakoster:~$ python
Python 2.7.3 (default, Jan 2 2013, 13:56:14)
[GCC 4.7.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.jaap@liakoster:~$ ls --full-time /var/django/test2/art/templates/art_index.html
-rwxrwx--- 1 lia www-data 2456 2014-03-02 19:16:55.568139590 +0000 /var/django/test2/art/templates/art_index.html
jaap@liakoster:~$
....

ls gives the right modification time. What is wrong?

....
jaap@liakoster:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description: Debian GNU/Linux 7.4 (wheezy)
Release: 7.4
Codename: wheezy
jaap@liakoster:~$ uname -a
Linux liakoster.shrl.nl 3.2.0-4-amd64 #1 SMP Debian 3.2.46-1+deb7u1 x86_64 GNU/Linux
jaap@liakoster:~$
....