Found a solution. For query string you have to add it to both the http_headers
dictionary AND to the URL when making the Request.
<h2>old line:</h2>
http_headers = {}
http_headers['oauth_version'] = '1.0'
<h2>new line:</h2>
http_headers = {}
http_headers['date'] = 'ddmmyyyy' #add this line
http_headers['oauth_version'] = '1.0'
<h2>old line:</h2>
req = urllib2.Request(base_url)
<h2>new line:</h2>
req = urllib2.Request(base_url + '?date=ddmmyyyy')
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