Right in console, but not in anser. - python coding challenges - Py.CheckiO

Right in console, but not in anser.

I'm not sure, but why am I getting error in results, when console sad I'm right?

From: https://checkio.org/mission/days-diff/solve/

HTTP_USER_AGENT:

Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.106 Safari/537.36

Created at: 2016/07/13 21:28; Updated at: 2016/07/14 09:11

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