diff --git a/pyicloud/services/calendar.py b/pyicloud/services/calendar.py
index a8c0a31..1c7687f 100644
--- a/pyicloud/services/calendar.py
+++ b/pyicloud/services/calendar.py
@@ -2,7 +2,7 @@
 from datetime import datetime
 from calendar import monthrange
 
-from tzlocal import get_localzone
+from tzlocal import get_localzone_name
 
 
 class CalendarService:
@@ -27,7 +27,7 @@ class CalendarService:
         (a calendar) and a guid (an event's ID).
         """
         params = dict(self.params)
-        params.update({"lang": "en-us", "usertz": get_localzone().zone})
+        params.update({"lang": "en-us", "usertz": get_localzone_name()})
         url = f"{self._calendar_event_detail_url}/{pguid}/{guid}"
         req = self.session.get(url, params=params)
         self.response = req.json()
@@ -49,7 +49,7 @@ class CalendarService:
         params.update(
             {
                 "lang": "en-us",
-                "usertz": get_localzone().zone,
+                "usertz": get_localzone_name(),
                 "startDate": from_dt.strftime("%Y-%m-%d"),
                 "endDate": to_dt.strftime("%Y-%m-%d"),
             }
@@ -76,7 +76,7 @@ class CalendarService:
         params.update(
             {
                 "lang": "en-us",
-                "usertz": get_localzone().zone,
+                "usertz": get_localzone_name(),
                 "startDate": from_dt.strftime("%Y-%m-%d"),
                 "endDate": to_dt.strftime("%Y-%m-%d"),
             }
diff --git a/pyicloud/services/photos.py b/pyicloud/services/photos.py
index 5808fab..06b3dd3 100644
--- a/pyicloud/services/photos.py
+++ b/pyicloud/services/photos.py
@@ -3,9 +3,8 @@ import json
 import base64
 from urllib.parse import urlencode
 
-from datetime import datetime
+from datetime import datetime, timezone
 from pyicloud.exceptions import PyiCloudServiceNotActivatedException
-from pytz import UTC
 
 
 class PhotosService:
@@ -526,18 +525,18 @@ class PhotoAsset:
     def asset_date(self):
         """Gets the photo asset date."""
         try:
-            return datetime.fromtimestamp(
-                self._asset_record["fields"]["assetDate"]["value"] / 1000.0, tz=UTC
-            )
+            return datetime.utcfromtimestamp(
+                self._asset_record["fields"]["assetDate"]["value"] / 1000.0
+            ).replace(tzinfo=timezone.utc)
         except KeyError:
-            return datetime.fromtimestamp(0)
+            return datetime.utcfromtimestamp(0).replace(tzinfo=timezone.utc)
 
     @property
     def added_date(self):
         """Gets the photo added date."""
-        return datetime.fromtimestamp(
-            self._asset_record["fields"]["addedDate"]["value"] / 1000.0, tz=UTC
-        )
+        return datetime.utcfromtimestamp(
+            self._asset_record["fields"]["addedDate"]["value"] / 1000.0
+        ).replace(tzinfo=timezone.utc)
 
     @property
     def dimensions(self):
diff --git a/pyicloud/services/reminders.py b/pyicloud/services/reminders.py
index df37d89..949586b 100644
--- a/pyicloud/services/reminders.py
+++ b/pyicloud/services/reminders.py
@@ -4,7 +4,7 @@ import time
 import uuid
 import json
 
-from tzlocal import get_localzone
+from tzlocal import get_localzone_name
 
 
 class RemindersService:
@@ -24,7 +24,7 @@ class RemindersService:
         """Refresh data."""
         params_reminders = dict(self._params)
         params_reminders.update(
-            {"clientVersion": "4.0", "lang": "en-us", "usertz": get_localzone().zone}
+            {"clientVersion": "4.0", "lang": "en-us", "usertz": get_localzone_name()}
         )
 
         # Open reminders
@@ -76,7 +76,7 @@ class RemindersService:
 
         params_reminders = dict(self._params)
         params_reminders.update(
-            {"clientVersion": "4.0", "lang": "en-us", "usertz": get_localzone().zone}
+            {"clientVersion": "4.0", "lang": "en-us", "usertz": get_localzone_name()}
         )
 
         due_dates = None
diff --git a/requirements.txt b/requirements.txt
index 5cf4b74..d643176 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,6 +2,5 @@ requests>=2.24.0
 keyring>=21.4.0
 keyrings.alt>=3.5.2
 click>=7.1.2
-tzlocal==2.1
-pytz>=2020.1
+tzlocal>=4.0
 certifi>=2020.6.20