[Python] python: datetime strftime not working properly

I am trying to print a date time into a file in a particular format due to which I have formatting a datetime object using strftime function as below:

hFile = open("Test.csv", 'w')
for str in datelist:
splitStr = str.split("_")
dateTime = datetime.datetime(int(splitStr[0]), int(splitStr[1]), int(splitStr[2]), int(splitStr[3]), int(splitStr[4]), int(splitStr[6]))
hFile.write(dateTime.strftime('%H:%M %d/%m/%Y'))


This for some of the cases works well and prints it in correct format but for some cases it prints it in the following format:

>1/4/2013 12:45


instead of

>12:45 1/04/2013


But when I only do:

>dateTime.strftime('%H %d/%m/%Y')


It doesn't switch the time and date in certain cases and prints it in correct format for all the cases. Any idea why is it happening?

An Important observartion: Everything works fine when I remove the :. So, the below command works fine. Now that makes me more confused.

>dateTime.strftime('%H %M %d/%m/%Y')


works perfectly fine. Any idea what is the issue with putting : in the strftime?

Thanks.

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