In [9]: datetime.datetime.now().strftime('%F-%T%z')
Out[9]: '2014-12-18-23:25:42'

In [10]: datetime.datetime.strptime(datetime.datetime.now().strftime('%F-%T%z'), '%F-%T%z')
---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
/deploy/ssman/current/ssman/app/management/commands/shell.pyc in <module>()
----> 1 datetime.datetime.strptime(datetime.datetime.now().strftime('%F-%T%z'), '%F-%T%z')

/usr/lib/python2.7/_strptime.pyc in _strptime(data_string, format)
    315                 del err
    316                 raise ValueError("'%s' is a bad directive in format '%s'" %
--> 317                                     (bad_directive, format))
    318             # IndexError only occurs when the format string is "%"
    319             except IndexError:

ValueError: 'F' is a bad directive in format '%F-%T%z'