Though %f is a valid format from Python's doc https://docs.python.org/2/library/datetime.html, the fix just ignores it on Windows? can we atleast get milliseconds on Windows and Micro on Linux?

%f 	Microsecond as a decimal number, zero-padded on the left. 	000000, 000001, ..., 999999 	(4)

%f is an extension to the set of format characters in the C standard (but implemented separately in datetime objects, and therefore always available). When used with the strptime() method, the %f directive accepts from one to six digits and zero pads on the right.

New in version 2.6.