diff --git a/app/templates/postcard_form.html b/app/templates/postcard_form.html
index 19c469a..28dcb56 100644
--- a/app/templates/postcard_form.html
+++ b/app/templates/postcard_form.html
@@ -55,7 +55,7 @@
     <div id="fields-sent-delivered">
         <label>{{ 'pc_form.recipient'|t(user.language) }} *</label>
         <input type="text" name="recipient_name" value="{{ postcard.recipient_name if is_edit else '' }}">
-        <label>{{ 'pc_form.send_time'|t(user.language) }} *</label>
+        <label id="label-send-time">{{ 'pc_form.send_time'|t(user.language) }} *</label>
         <input type="date" name="send_time" id="input-send-time" value="{{ postcard.send_time.strftime('%Y-%m-%d') if is_edit and postcard.send_time else (today if is_new else '') }}">
         <label id="label-arrival">{{ 'pc_form.arrival_time'|t(user.language) }}</label>
         <input type="date" name="arrival_time" id="input-arrival" value="{{ postcard.arrival_time.strftime('%Y-%m-%d') if is_edit and postcard.arrival_time else '' }}" {% if is_new or (is_edit and edit_status=='sent') %}disabled{% endif %}>
@@ -79,21 +79,25 @@
 </form>
 <script>
 {% if is_new and not is_received_form %}
-// ── 新建寄出：根据日期自动判定状态，可手动覆盖 ──
+// ── 新建寄出：待寄出时禁用寄出时间，寄出时自动填入 ──
 (function() {
     var sendTime = document.getElementById('input-send-time');
     var select = document.getElementById('status-select');
     var arrival = document.getElementById('input-arrival');
     var labelArrival = document.getElementById('label-arrival');
+    var labelSend = document.getElementById('label-send-time');
     var today = new Date().toISOString().slice(0, 10);
-    if (!sendTime.value) sendTime.value = today;
 
-    var userOverrode = false;
-
-    function autoFromSendTime() {
-        var v = sendTime.value;
-        if (!v) return 'sent';
-        return v > today ? 'pending' : 'sent';
+    function updateSendTime(s) {
+        if (s === 'pending') {
+            sendTime.disabled = true;
+            sendTime.value = '';
+            if (labelSend) labelSend.textContent = '{{ "pc_form.send_time"|t(user.language) }}';
+        } else {
+            sendTime.disabled = false;
+            if (!sendTime.value) sendTime.value = today;
+            if (labelSend) labelSend.textContent = '{{ "pc_form.send_time"|t(user.language) }} *';
+        }
     }
 
     function updateArrival(s) {
@@ -109,22 +113,29 @@
     }
 
     function sync() {
-        var auto = autoFromSendTime();
-        if (!userOverrode) select.value = auto;
         updateArrival(select.value);
+        updateSendTime(select.value);
     }
 
-    select.addEventListener('change', function() { userOverrode = true; updateArrival(select.value); });
-    sendTime.addEventListener('change', function() { if (!userOverrode) sync(); });
-    sendTime.addEventListener('input', function() { if (!userOverrode) sync(); });
+    select.addEventListener('change', sync);
     sync();
 })();
 {% elif is_edit and not is_received_form %}
-// ── 编辑寄出：根据状态切换 arrival 可用性 ──
+// ── 编辑寄出：根据状态切换 send_time / arrival 可用性 ──
 function toggleFields() {
     var s = document.getElementById('status-select').value;
+    var sendTime = document.getElementById('input-send-time');
+    var labelSend = document.getElementById('label-send-time');
     var arrival = document.getElementById('input-arrival');
     var labelArrival = document.getElementById('label-arrival');
+    var today = new Date().toISOString().slice(0, 10);
+    if (s === 'pending') {
+        sendTime.disabled = true;
+        if (labelSend) labelSend.textContent = '{{ "pc_form.send_time"|t(user.language) }}';
+    } else {
+        sendTime.disabled = false;
+        if (labelSend) labelSend.textContent = '{{ "pc_form.send_time"|t(user.language) }} *';
+    }
     if (s === 'delivered') {
         arrival.disabled = false;
         labelArrival.textContent = '{{ "pc_form.arrival_time"|t(user.language) }} *';