diff --git a/app/Models/User.php b/app/Models/User.php
index c58001a..b00543f 100755
--- a/app/Models/User.php
+++ b/app/Models/User.php
@@ -125,6 +125,72 @@ class User extends Authenticatable implements Auditable
         'is_schoolmate' => ['否', '是'],
     ];
 
+    public static function normalizeBirthday($birthday): ?string
+    {
+        if ($birthday instanceof DateTimeInterface) {
+            return Carbon::instance(\DateTime::createFromInterface($birthday))->format('Y-m-d');
+        }
+
+        if ($birthday === null) {
+            return null;
+        }
+
+        $birthday = trim((string) $birthday);
+        if ($birthday === '') {
+            return null;
+        }
+
+        $normalized = str_replace(
+            ['年', '月', '日', '/', '.', '_'],
+            ['-', '-', '', '-', '-', '-'],
+            $birthday
+        );
+        $normalized = preg_replace('/\s+/', '', $normalized);
+        $normalized = preg_replace('/-+/', '-', $normalized);
+        $normalized = trim($normalized, '-');
+
+        if (preg_match('/^(\d{4})(\d{2})$/', $normalized, $matches)) {
+            $normalized = $matches[1] . '-' . $matches[2];
+        } elseif (preg_match('/^(\d{4})(\d{2})(\d{2})$/', $normalized, $matches)) {
+            $normalized = $matches[1] . '-' . $matches[2] . '-' . $matches[3];
+        }
+
+        if (preg_match('/^(\d{4})-(\d{1,2})$/', $normalized, $matches)) {
+            $year = (int) $matches[1];
+            $month = (int) $matches[2];
+
+            if ($month >= 1 && $month <= 12) {
+                return sprintf('%04d-%02d', $year, $month);
+            }
+        }
+
+        if (preg_match('/^(\d{4})-(\d{1,2})-(\d{1,2})$/', $normalized, $matches)) {
+            $year = (int) $matches[1];
+            $month = (int) $matches[2];
+            $day = (int) $matches[3];
+
+            if (checkdate($month, $day, $year)) {
+                return sprintf('%04d-%02d-%02d', $year, $month, $day);
+            }
+        }
+
+        return null;
+    }
+
+    public static function hasBirthdayFormat(?string $birthday): bool
+    {
+        if (empty($birthday)) {
+            return false;
+        }
+
+        if (preg_match('/^\d{4}-\d{2}$/', $birthday)) {
+            [, $month] = array_map('intval', explode('-', $birthday));
+            return $month >= 1 && $month <= 12;
+        }
+
+        return self::hasCompleteBirthday($birthday);
+    }
+
     public static function hasCompleteBirthday(?string $birthday): bool
     {
         if (empty($birthday) || !preg_match('/^\d{4}-\d{2}-\d{2}$/', $birthday)) {
@@ -145,6 +211,11 @@ class User extends Authenticatable implements Auditable
         return substr($birthday, 5, 5) === date('m-d');
     }
 
+    public function setBirthdayAttribute($value): void
+    {
+        $this->attributes['birthday'] = self::normalizeBirthday($value);
+    }
+
     public function getMobileAttribute($value)
     {
         // 如果url中包含admin字符串，则所有的手机号显示中间4位星号代替