diff --git a/server/lib/python/cartodb_services/README.md b/server/lib/python/cartodb_services/README.md
index 9df0571..3703c82 100644
--- a/server/lib/python/cartodb_services/README.md
+++ b/server/lib/python/cartodb_services/README.md
@@ -40,7 +40,11 @@ OK
 ```
 
 ## Running the integration tests
-TBD
+See the [[../../../../test/README.md]]. Basically, move to the `/test` directory at the top level of this repo and execute the `run_tests.py` script:
+```sh
+cd $(git rev-parse --show-toplevel)/test
+python run_tests.py --host=$YOUR_HOST $YOUR_USERNAME $YOUR_API_KEY
+```
 
 ## TODO
 - Move dependencies expressed in `requirements.txt` to `setup.py`
diff --git a/server/lib/python/cartodb_services/cartodb_services/metrics/user.py b/server/lib/python/cartodb_services/cartodb_services/metrics/user.py
index 90c9698..30bd5a1 100644
--- a/server/lib/python/cartodb_services/cartodb_services/metrics/user.py
+++ b/server/lib/python/cartodb_services/cartodb_services/metrics/user.py
@@ -8,6 +8,7 @@ class UserMetricsService:
     SERVICE_GEOCODER_NOKIA = 'geocoder_here'
     SERVICE_GEOCODER_CACHE = 'geocoder_cache'
     SERVICE_HERE_ISOLINES = 'here_isolines'
+    DAY_OF_MONTH_ZERO_PADDED = '%d'
 
     def __init__(self, user_geocoder_config, redis_connection):
         self._user_geocoder_config = user_geocoder_config
@@ -85,7 +86,7 @@ class UserMetricsService:
                                                      service, metric, date)
             score = self._redis_connection.zscore(redis_prefix, date.day)
             aggregated_metric += score if score else 0
-            zero_padded_day = date.strftime('%d')
+            zero_padded_day = date.strftime(self.DAY_OF_MONTH_ZERO_PADDED)
             if str(date.day) != zero_padded_day:
                 score = self._redis_connection.zscore(redis_prefix, zero_padded_day)
                 aggregated_metric += score if score else 0
@@ -97,12 +98,16 @@ class UserMetricsService:
     def __increment_user_uses(self, service_type, metric, date, amount):
         redis_prefix = self.__parse_redis_prefix("user", self._username,
                                                  service_type, metric, date)
-        self._redis_connection.zincrby(redis_prefix, date.day, amount)
+        self._redis_connection.zincrby(redis_prefix,
+                                       date.strftime(self.DAY_OF_MONTH_ZERO_PADDED),
+                                       amount)
 
     def __increment_organization_uses(self, service_type, metric, date, amount):
         redis_prefix = self.__parse_redis_prefix("org", self._orgname,
                                                  service_type, metric, date)
-        self._redis_connection.zincrby(redis_prefix, date.day, amount)
+        self._redis_connection.zincrby(redis_prefix,
+                                       date.strftime(self.DAY_OF_MONTH_ZERO_PADDED),
+                                       amount)
 
     def __parse_redis_prefix(self, prefix, entity_name, service_type, metric,
                              date):
diff --git a/server/lib/python/cartodb_services/setup.py b/server/lib/python/cartodb_services/setup.py
index 6b46234..a31ecb6 100644
--- a/server/lib/python/cartodb_services/setup.py
+++ b/server/lib/python/cartodb_services/setup.py
@@ -10,7 +10,7 @@ from setuptools import setup, find_packages
 setup(
     name='cartodb_services',
 
-    version='0.6.3',
+    version='0.6.4',
 
     description='CartoDB Services API Python Library',
 
diff --git a/server/lib/python/cartodb_services/test/test_user_service.py b/server/lib/python/cartodb_services/test/test_user_service.py
index fc0b6c6..a73e00b 100644
--- a/server/lib/python/cartodb_services/test/test_user_service.py
+++ b/server/lib/python/cartodb_services/test/test_user_service.py
@@ -116,6 +116,21 @@ class TestUserService(TestCase):
         #('user:test_user:geocoder_cache:success_responses:201506', 15)
         assert self.redis_conn.zscore_counter() == 3
 
+    def test_should_write_zero_padded_dates(self):
+        us = self.__build_user_service('test_user')
+        us.increment_service_use(self.NOKIA_GEOCODER, 'success_responses',
+                                 date=date(2015,6,1))
+        assert self.redis_conn.zscore('user:test_user:geocoder_here:success_responses:201506', '01') == 1
+        assert self.redis_conn.zscore('user:test_user:geocoder_here:success_responses:201506',  '1') == None
+
+    def test_orgs_should_write_zero_padded_dates(self):
+        us = self.__build_user_service('test_user', orgname='test_org')
+        us.increment_service_use(self.NOKIA_GEOCODER, 'success_responses',
+                                 amount=400,
+                                 date=date(2015,6,1))
+        assert self.redis_conn.zscore('org:test_org:geocoder_here:success_responses:201506', '01') == 400
+        assert self.redis_conn.zscore('org:test_org:geocoder_here:success_responses:201506',  '1') == None
+
 
     def __build_user_service(self, username, quota=100, service='heremaps',
                              orgname=None, soft_limit=False,