Converting an unknown timestamp to a datetime in Python

I'm getting a timestamp back from the WordPress API, but the usual method of converting from timestamp to datetime is failing me.

I run this:

print pages[1]['dateCreated']
print datetime.fromtimestamp(pages[1]['dateCreated'])

And get this:

20100228T09:25:07
Traceback (most recent call last):
  File "C:\Python26\Lib\SITE-P~1\PYTHON~1\pywin\framework\scriptutils.py", line 325, in RunScript
    exec codeObject in __main__.__dict__
  File "C:\Documents and Settings\mmorisy\Desktop\My Dropbox\python\betterblogmaster3.py", line 28, in <module>
    print datetime.fromtimestamp(pages[1]['dateCreated'])
AttributeError: DateTime instance has no attribute '__float__'

Any suggestions?

Assume you've from datetime import datetime:

print datetime.strptime(pages[1]['dateCreated'],'%Y%m%dT%H:%M:%S')