diff --git a/app/Http/Requests/WorkoutSessionsCalendarRequest.php b/app/Http/Requests/WorkoutSessionsCalendarRequest.php
new file mode 100644
index 0000000..4fbe6a3
--- /dev/null
+++ b/app/Http/Requests/WorkoutSessionsCalendarRequest.php
@@ -0,0 +1,30 @@
+<?php
+
+namespace App\Http\Requests;
+
+use Illuminate\Foundation\Http\FormRequest;
+
+class WorkoutSessionsCalendarRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    /**
+     * @return array<string, \Illuminate\Contracts\Validation\ValidationRule|array<mixed>|string>
+     */
+    public function rules(): array
+    {
+        return [
+            'month' => ['sometimes', 'date_format:Y-m'],
+        ];
+    }
+
+    public function messages(): array
+    {
+        return [
+            'month.date_format' => __('api.validation.month_valid'),
+        ];
+    }
+}