TypeError in date_parse.py

[pestrella at gmail.com]

I think it's a float, I see in the code 

if request.method == "POST":
        end_timestamp = request.POST.get('end_timestamp', None)
        start_timestamp = request.POST.get('start_timestamp', None)

and in the debug of django 

<QueryDict: {u'start_timestamp': [u'1378918630.398'],