diff --git a/app/Http/Controllers/HomeController.php b/app/Http/Controllers/HomeController.php
index b7effe3..a3b447d 100644
--- a/app/Http/Controllers/HomeController.php
+++ b/app/Http/Controllers/HomeController.php
@@ -44,7 +44,7 @@ SQL
             if (count($ejaculations) > 0) {
                 $currentSession = Carbon::parse($ejaculations[0]['ejaculated_date'])
                     ->diff(Carbon::now())
-                    ->format('%d日 %h時間 %i分');
+                    ->format('%a日 %h時間 %i分');
             } else {
                 $currentSession = null;
             }
diff --git a/app/Http/Controllers/UserController.php b/app/Http/Controllers/UserController.php
index 8e07b63..3f2cad8 100644
--- a/app/Http/Controllers/UserController.php
+++ b/app/Http/Controllers/UserController.php
@@ -40,7 +40,7 @@ SQL
         if (count($ejaculations) > 0) {
             $currentSession = Carbon::parse($ejaculations[0]['ejaculated_date'])
                 ->diff(Carbon::now())
-                ->format('%d日 %h時間 %i分');
+                ->format('%a日 %h時間 %i分');
         } else {
             $currentSession = null;
         }