If you read the paragraph preceding the table of directives [1], you will see that "The full set of format codes supported varies across platforms, because Python calls the platform C library’s strftime() function, and platform variations are common. To see the full set of format codes supported on your platform, consult the strftime(3) documentation."


[1] https://docs.python.org/2/library/datetime.html#strftime-and-strptime-behavior