ValueError: unconverted data remains: +00:00
<p>i'm trying to build an API using eve.
All is good when i test my api using 'POSTMAN', but when i use android application i have this log at PyCharm.
i'm using Volley as HTTP library. 
thank you for help</p>

<pre><code>127.0.0.1 - - [08/May/2016 10:37:29] "GET /accounts HTTP/1.1" 500 -
Traceback (most recent call last):
  File "/usr/lib/python3.5/site-packages/eve/flaskapp.py", line 946, in __call__
    return super(Eve, self).__call__(environ, start_response)
  File "/usr/lib/python3.5/site-packages/flask/app.py", line 1836, in __call__
    return self.wsgi_app(environ, start_response)
  File "/usr/lib/python3.5/site-packages/flask/app.py", line 1820, in wsgi_app
    response = self.make_response(self.handle_exception(e))
  File "/usr/lib/python3.5/site-packages/flask/app.py", line 1403, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "/usr/lib/python3.5/site-packages/flask/_compat.py", line 33, in reraise
    raise value
  File "/usr/lib/python3.5/site-packages/flask/app.py", line 1817, in wsgi_app
    response = self.full_dispatch_request()
  File "/usr/lib/python3.5/site-packages/flask/app.py", line 1477, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/usr/lib/python3.5/site-packages/flask/app.py", line 1381, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/usr/lib/python3.5/site-packages/flask/_compat.py", line 33, in reraise
    raise value
  File "/usr/lib/python3.5/site-packages/flask/app.py", line 1475, in full_dispatch_request
    rv = self.dispatch_request()
  File "/usr/lib/python3.5/site-packages/flask/app.py", line 1461, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/usr/lib/python3.5/site-packages/eve/endpoints.py", line 54, in collections_endpoint
    response = get(resource, lookup)
  File "/usr/lib/python3.5/site-packages/eve/methods/common.py", line 242, in rate_limited
    return f(*args, **kwargs)
  File "/usr/lib/python3.5/site-packages/eve/auth.py", line 79, in decorated
    return f(*args, **kwargs)
  File "/usr/lib/python3.5/site-packages/eve/methods/common.py", line 944, in decorated
    r = f(resource, **combined_args)
  File "/usr/lib/python3.5/site-packages/eve/methods/get.py", line 92, in get
    req = parse_request(resource)
  File "/usr/lib/python3.5/site-packages/eve/utils.py", line 155, in parse_request
    r.if_modified_since = weak_date(headers.get('If-Modified-Since'))
  File "/usr/lib/python3.5/site-packages/eve/utils.py", line 174, in weak_date
    timedelta(seconds=1) if date else None
  File "/usr/lib/python3.5/_strptime.py", line 500, in _strptime_datetime
    tt, fraction = _strptime(data_string, format)
  File "/usr/lib/python3.5/_strptime.py", line 340, in _strptime
    data_string[found.end():])
ValueError: unconverted data remains: +00:00
</code></pre>