diff --git a/internal/web/static/app.js b/internal/web/static/app.js
index d6d23fc..9af8fba 100644
--- a/internal/web/static/app.js
+++ b/internal/web/static/app.js
@@ -69,20 +69,38 @@
     var daysWrap = form.querySelector('[data-days-wrap]');
     var countWrap = form.querySelector('[data-count-wrap]');
     var endWrap = form.querySelector('[data-end-wrap]');
+    var startWrap = form.querySelector('[data-start-wrap]');
+    var startInput = form.querySelector('input[name="start_date"]');
     if (!sel) return;
 
     function sync() {
       var opt = sel.options[sel.selectedIndex];
       var unit = opt && opt.getAttribute('data-unit');
       var amount = opt && opt.getAttribute('data-amount');
-      if (unit === 'count') {
-        if (daysWrap) daysWrap.hidden = true;
-        if (countWrap) { countWrap.hidden = false; if (amount) countWrap.querySelector('input').value = amount; }
-        if (endWrap) endWrap.hidden = true;
-      } else if (unit === 'season') {
+      var validity = opt && parseInt(opt.getAttribute('data-validity') || '0', 10);
+      var endInput = endWrap && endWrap.querySelector('input');
+
+      if (unit === 'season') {
         if (daysWrap) daysWrap.hidden = true;
         if (countWrap) countWrap.hidden = true;
         if (endWrap) endWrap.hidden = true;
+        if (startWrap) startWrap.hidden = true;
+        if (startInput) startInput.required = false;
+        return;
+      }
+
+      if (startWrap) startWrap.hidden = false;
+      if (startInput) startInput.required = true;
+
+      if (unit === 'count') {
+        if (daysWrap) daysWrap.hidden = true;
+        if (countWrap) { countWrap.hidden = false; if (amount) countWrap.querySelector('input').value = amount; }
+        if (endWrap) endWrap.hidden = false;
+        if (validity > 0 && endInput && !endInput.value && startInput && startInput.value) {
+          var d = new Date(startInput.value + 'T00:00:00');
+          d.setDate(d.getDate() + validity - 1);
+          endInput.value = d.toISOString().slice(0, 10);
+        }
       } else if (unit === 'day') {
         if (daysWrap) { daysWrap.hidden = false; if (amount) daysWrap.querySelector('input').value = amount; }
         if (countWrap) countWrap.hidden = true;
diff --git a/internal/web/templates/pages/customer_detail.html b/internal/web/templates/pages/customer_detail.html
index b4add4d..accf809 100644
--- a/internal/web/templates/pages/customer_detail.html
+++ b/internal/web/templates/pages/customer_detail.html
@@ -89,12 +89,12 @@
       <select name="package_id" required data-pkg-select>
         <option value="">选择套餐…</option>
         {{range .D.Packages}}
-        <option value="{{.ID}}" data-unit="{{if .Season}}season{{else}}{{.Unit}}{{end}}" data-amount="{{.DefaultAmount}}"{{if .Archived}} disabled{{end}}{{if .SeasonExpired $.TodayStr}} disabled{{end}}>
+        <option value="{{.ID}}" data-unit="{{if .Season}}season{{else}}{{.Unit}}{{end}}" data-amount="{{.DefaultAmount}}" data-validity="{{.DefaultValidityDays}}"{{if .Archived}} disabled{{end}}{{if .SeasonExpired $.TodayStr}} disabled{{end}}>
           {{.Name}} · {{.UnitLabel}} {{if .Season}}{{.SeasonStart}}~{{.SeasonEnd}}{{else}}{{.DefaultAmount}}{{if eq .Unit "day"}}天{{else}}次{{end}}{{end}}{{if .SeasonExpired $.TodayStr}}（赛季已结束）{{end}}{{if .Archived}}（已归档）{{end}}
         </option>
         {{end}}
       </select>
-      <label class="inline-field">开始日
+      <label class="inline-field" data-start-wrap>开始日
         <input type="date" name="start_date" value="{{.TodayStr}}" required>
       </label>
       <label class="inline-field" data-days-wrap>{{/* 默认显示 */}}
diff --git a/internal/web/templates/pages/package_form.html b/internal/web/templates/pages/package_form.html
index 1a703c9..1c2446b 100644
--- a/internal/web/templates/pages/package_form.html
+++ b/internal/web/templates/pages/package_form.html
@@ -16,7 +16,7 @@
     <fieldset class="field">
       <span>计费方式 <i>*</i></span>
       <div class="radios">
-        <label><input type="radio" name="unit" value="day"{{if eq .D.Package.Unit "day"}} checked{{end}}>
+        <label><input type="radio" name="unit" value="day"{{if and (eq .D.Package.Unit "day") (not .D.Package.Season)}} checked{{end}}>
           <b>按日</b><small>有开始日与结束日，每天一条待打任务，可打卡</small></label>
         <label><input type="radio" name="unit" value="count"{{if and (eq .D.Package.Unit "count") (not .D.Package.Season)}} checked{{end}}>
           <b>按次</b><small>记录剩余次数，排期完成时自动扣 1 次，有效期可选</small></label>
diff --git a/main.go b/main.go
index c0784b8..b418fa6 100644
--- a/main.go
+++ b/main.go
@@ -26,7 +26,7 @@ import (
 	"daili/internal/web"
 )
 
-const version = "1.8.1"
+const version = "1.8.2"
 
 func main() {
 	cfgFlag := flag.String("config", "", "配置文件路径（默认：exe 同级的 "+config.FileName+"）")