diff --git a/.env.example b/.env.example
index 0e5bad7..862a20f 100644
--- a/.env.example
+++ b/.env.example
@@ -4,11 +4,7 @@ APP_KEY=
 APP_DEBUG=true
 APP_URL=http://localhost
 
-APP_TIMEZONE=PRC
-DB_TIMEZONE=+08:00
-
 LOG_CHANNEL=stack
-LOG_SLACK_WEBHOOK_URL=
 
 REDIS_HOST=127.0.0.1
 REDIS_PASSWORD=null
diff --git a/bootstrap/app.php b/bootstrap/app.php
index 5897ae4..af81b10 100644
--- a/bootstrap/app.php
+++ b/bootstrap/app.php
@@ -6,7 +6,7 @@
     dirname(__DIR__)
 ))->bootstrap();
 
-date_default_timezone_set(env('APP_TIMEZONE', 'UTC'));
+date_default_timezone_set(env('APP_TIMEZONE', 'PRC'));
 
 /*
 |--------------------------------------------------------------------------
diff --git a/config/database.php b/config/database.php
index f261a58..d3f965e 100644
--- a/config/database.php
+++ b/config/database.php
@@ -47,7 +47,7 @@
             'prefix' => env('DB_PREFIX', ''),
             'strict' => env('DB_STRICT_MODE', true),
             'engine' => env('DB_ENGINE'),
-            'timezone' => env('DB_TIMEZONE', '+00:00'),
+            'timezone' => env('DB_TIMEZONE', '+08:00'),
             'options' => [
                 PDO::ATTR_PERSISTENT => true,
             ],