diff --git a/pydexcom/__init__.py b/pydexcom/__init__.py
index 961548d..f77b465 100644
--- a/pydexcom/__init__.py
+++ b/pydexcom/__init__.py
@@ -3,11 +3,14 @@
 
 import requests
 
+import re
+
 from .const import (
     _LOGGER,
     ACCOUNT_ERROR_ACCOUNT_NOT_FOUND,
     ACCOUNT_ERROR_PASSWORD_INVALID,
     ACCOUNT_ERROR_PASSWORD_NULL_EMPTY,
+    ACCOUNT_ERROR_MAX_ATTEMPTS,
     ACCOUNT_ERROR_UNKNOWN,
     ACCOUNT_ERROR_USERNAME_NULL_EMPTY,
     ARGUEMENT_ERROR_MAX_COUNT_INVALID,
@@ -22,6 +25,7 @@
     DEXCOM_LOGIN_ENDPOINT,
     DEXCOM_TREND_ARROWS,
     DEXCOM_TREND_DESCRIPTIONS,
+    DEXCOM_TREND_DIRECTIONS,
     DEXCOM_VERIFY_SERIAL_NUMBER_ENDPOINT,
     MMOL_L_CONVERTION_FACTOR,
     SESSION_ERROR_SESSION_ID_DEFAULT,
@@ -41,10 +45,12 @@ def __init__(self, json_glucose_reading: dict):
         self.mg_dl = self.value
         self.mmol_l = round(self.value * MMOL_L_CONVERTION_FACTOR, 1)
         self.trend = json_glucose_reading["Trend"]
+        if not isinstance(self.trend, int):
+            self.trend = DEXCOM_TREND_DIRECTIONS.get(self.trend, 0)
         self.trend_description = DEXCOM_TREND_DESCRIPTIONS[self.trend]
         self.trend_arrow = DEXCOM_TREND_ARROWS[self.trend]
         self.time = datetime.datetime.fromtimestamp(
-            int(json_glucose_reading["WT"][6:][:-2]) / 1000.0
+            int(re.sub("[^0-9]", "", json_glucose_reading["WT"])) / 1000.0
         )
 
 
@@ -60,14 +66,23 @@ def __init__(self, username: str, password: str, ous: bool = False):
         self.create_session()
 
     def _request(
-        self, method: str, endpoint: str, params: dict = None, json: dict = {},
+        self,
+        method: str,
+        endpoint: str,
+        params: dict = None,
+        json: dict = {},
     ) -> dict:
         """Send request to Dexcom Share API."""
         try:
             url = f"{self.base_url}/{endpoint}"
             _LOGGER.debug(f"{method} request to {endpoint}:")
             _LOGGER.debug(f"url: {url} params:{params}, json: {json}")
-            r = requests.request(method, url, params=params, json=json,)
+            r = requests.request(
+                method,
+                url,
+                params=params,
+                json=json,
+            )
             _LOGGER.debug(f"{method} request response {r.status_code}:")
             _LOGGER.debug(f"json: {r.json()}")
             r.raise_for_status()
@@ -84,6 +99,8 @@ def _request(
                     raise AccountError(ACCOUNT_ERROR_ACCOUNT_NOT_FOUND)
                 elif r.json()["Code"] == "SSO_AuthenticatePasswordInvalid":
                     raise AccountError(ACCOUNT_ERROR_PASSWORD_INVALID)
+                elif r.json()["Code"] == "SSO_AuthenticateMaxAttemptsExceeed":
+                    raise AccountError(ACCOUNT_ERROR_MAX_ATTEMPTS)
                 elif r.json()["Code"] == "InvalidArgument":
                     if "accountName" in r.json()["Message"]:
                         raise AccountError(ACCOUNT_ERROR_USERNAME_NULL_EMPTY)
@@ -138,7 +155,7 @@ def create_session(self):
         """
         endpoint1 = DEXCOM_AUTHENTICATE_ENDPOINT
         endpoint2 = DEXCOM_LOGIN_ENDPOINT
-        
+
         self.session_id = self._request("post", endpoint1, json=json)
         try:
             self._validate_session_id()
diff --git a/pydexcom/const.py b/pydexcom/const.py
index 98b5f8d..4557b65 100644
--- a/pydexcom/const.py
+++ b/pydexcom/const.py
@@ -24,6 +24,7 @@
 ACCOUNT_ERROR_PASSWORD_NULL_EMPTY = "Password null or empty"
 ACCOUNT_ERROR_ACCOUNT_NOT_FOUND = "Account not found"
 ACCOUNT_ERROR_PASSWORD_INVALID = "Password not valid"
+ACCOUNT_ERROR_MAX_ATTEMPTS = "Maximum authentication attempts exceeded"
 ACCOUNT_ERROR_UNKNOWN = "Account error"
 
 SESSION_ERROR_SESSION_ID_NULL = "Session ID null"
@@ -49,6 +50,20 @@
     "unable to determine trend",
     "trend unavailable",
 ]
+
+DEXCOM_TREND_DIRECTIONS = {
+    "None": 0,  # unconfirmed
+    "DoubleUp": 1,
+    "SingleUp": 2,
+    "FortyFiveUp": 3,
+    "Flat": 4,
+    "FortyFiveDown": 5,
+    "SingleDown": 6,
+    "DoubleDown": 7,
+    "NotComputable": 8,  # unconfirmed
+    "RateOutOfRange": 9,  # unconfirmed
+}
+
 DEXCOM_TREND_ARROWS = ["", "↑↑", "↑", "↗", "→", "↘", "↓", "↓↓", "?", "-"]
 
 DEFAULT_SESSION_ID = "00000000-0000-0000-0000-000000000000"
diff --git a/tests/test_authentication.py b/tests/test_authentication.py
index 0ae8f5a..2bbbf8e 100644
--- a/tests/test_authentication.py
+++ b/tests/test_authentication.py
@@ -65,5 +65,9 @@ def test_login_endpoint_not_verbose():
         "password": "a",
         "applicationId": DEXCOM_APPLICATION_ID,
     }
-    r = requests.request("post", url, json=json,)
+    r = requests.request(
+        "post",
+        url,
+        json=json,
+    )
     assert r.json() == DEFAULT_SESSION_ID