diff --git a/assets/admin/pages/AppointmentsPage.tsx b/assets/admin/pages/AppointmentsPage.tsx
index 5611be06..7aa596a1 100644
--- a/assets/admin/pages/AppointmentsPage.tsx
+++ b/assets/admin/pages/AppointmentsPage.tsx
@@ -292,6 +292,8 @@ function CancelledBadge({ appt }: { appt: Appointment }) {
 }
 
 function SlotCard({ slot, queryKey, onBook }: { slot: SlotItem; queryKey: unknown[]; onBook: (slot: SlotItem) => void }) {
+  const isPast = slot.start < Math.floor(Date.now() / 1000);
+
   if (!slot.is_available && slot.appointment) {
     const a = slot.appointment;
     const sm = statusMeta(a.status);
@@ -299,6 +301,7 @@ function SlotCard({ slot, queryKey, onBook }: { slot: SlotItem; queryKey: unknow
       <div style={{
         border: `1.5px solid ${sm.color}40`, borderRadius: 'var(--r)',
         background: sm.bg, overflow: 'hidden',
+        opacity: isPast ? 0.6 : 1,
       }}>
         <div style={{
           padding: '8px 12px', display: 'flex', alignItems: 'center', justifyContent: 'space-between',
@@ -324,6 +327,22 @@ function SlotCard({ slot, queryKey, onBook }: { slot: SlotItem; queryKey: unknow
   }
 
   // Available slot — possibly with cancelled history
+  if (isPast) {
+    return (
+      <div style={{ display: 'flex', flexDirection: 'column' }}>
+        {slot.cancelled_appointment && <CancelledBadge appt={slot.cancelled_appointment} />}
+        <div style={{
+          border: '1.5px dashed #d1d5db', borderRadius: 'var(--r)', padding: '10px 16px',
+          display: 'flex', alignItems: 'center', justifyContent: 'center',
+          cursor: 'not-allowed', color: '#9ca3af', fontSize: 13, fontWeight: 600,
+          background: '#f9fafb', gap: 6,
+        }}>
+          <span style={{ fontSize: 15 }}>⊘</span> گذشته
+        </div>
+      </div>
+    );
+  }
+
   return (
     <div style={{ display: 'flex', flexDirection: 'column' }}>
       {slot.cancelled_appointment && <CancelledBadge appt={slot.cancelled_appointment} />}
diff --git a/src/Appointment/Controller/AppointmentController.php b/src/Appointment/Controller/AppointmentController.php
index 4eade752..ab1d19dd 100644
--- a/src/Appointment/Controller/AppointmentController.php
+++ b/src/Appointment/Controller/AppointmentController.php
@@ -173,6 +173,10 @@ class AppointmentController extends BaseController
             return $this->error(ErrorCodes::ERR_VALIDATION_001, 'doctor_uuid، slot_start و slot_end الزامی است', 422);
         }
 
+        if ($slotStart < time()) {
+            return $this->error(ErrorCodes::ERR_VALIDATION_001, 'زمان این اسلات گذشته است', 422);
+        }
+
         $doctor = $this->doctorRepo->findByUuid($doctorUuid);
         if ($doctor === null) {
             return $this->error(ErrorCodes::ERR_VALIDATION_002, 'دکتر یافت نشد', 404);
diff --git a/src/Appointment/Controller/MyAppointmentsController.php b/src/Appointment/Controller/MyAppointmentsController.php
index 2315d0e0..c9bd614a 100644
--- a/src/Appointment/Controller/MyAppointmentsController.php
+++ b/src/Appointment/Controller/MyAppointmentsController.php
@@ -45,6 +45,10 @@ class MyAppointmentsController extends BaseController
             return $this->error('VALIDATION', 'همه فیلدها الزامی است', 422);
         }
 
+        if ($slotStart < time()) {
+            return $this->error('SLOT_PAST', 'زمان این اسلات گذشته است', 422);
+        }
+
         $doctor = $this->doctorRepo->findByUuid($doctorUuid);
         if (!$doctor) return $this->error('DOCTOR_NOT_FOUND', 'پزشک یافت نشد', 404);