diff --git a/app/components/Common.jsx b/app/components/Common.jsx
index ae17dca..53dd20b 100644
--- a/app/components/Common.jsx
+++ b/app/components/Common.jsx
@@ -27,7 +27,7 @@ const nowInTz = () => dayjs().tz(TZ);
 const toTz = (input) => (input ? dayjs.tz(input, TZ) : nowInTz());
 const formatDate = (input) => toTz(input).format('YYYY-MM-DD');
 
-export function DatePicker({ value, onChange }) {
+export function DatePicker({ value, onChange, position = 'bottom' }) {
   const [isOpen, setIsOpen] = useState(false);
   const [currentMonth, setCurrentMonth] = useState(() => value ? toTz(value) : nowInTz());
 
@@ -83,16 +83,15 @@ export function DatePicker({ value, onChange }) {
       <AnimatePresence>
         {isOpen && (
           <motion.div
-            initial={{ opacity: 0, y: 10, scale: 0.95 }}
+            initial={{ opacity: 0, y: position === 'top' ? -10 : 10, scale: 0.95 }}
             animate={{ opacity: 1, y: 0, scale: 1 }}
-            exit={{ opacity: 0, y: 10, scale: 0.95 }}
+            exit={{ opacity: 0, y: position === 'top' ? -10 : 10, scale: 0.95 }}
             className="date-picker-dropdown glass card"
             style={{
               position: 'absolute',
-              top: '100%',
+              ...(position === 'top' ? { bottom: '100%', marginBottom: 8 } : { top: '100%', marginTop: 8 }),
               left: 0,
               width: '100%',
-              marginTop: 8,
               padding: 12,
               zIndex: 10
             }}
diff --git a/app/components/FundCard.jsx b/app/components/FundCard.jsx
index e5577a1..b8e023a 100644
--- a/app/components/FundCard.jsx
+++ b/app/components/FundCard.jsx
@@ -267,6 +267,20 @@ export default function FundCard({
                 {masked ? '******' : `¥${profit.amount.toFixed(2)}`}
               </span>
             </div>
+            {holding?.firstPurchaseDate && !masked && (() => {
+              const today = dayjs.tz(todayStr, TZ);
+              const purchaseDate = dayjs.tz(holding.firstPurchaseDate, TZ);
+              if (!purchaseDate.isValid()) return null;
+              const days = today.diff(purchaseDate, 'day');
+              return (
+                <div className="stat" style={{ flexDirection: 'column', gap: 4 }}>
+                  <span className="label">持有天数</span>
+                  <span className="value">
+                    {days}天
+                  </span>
+                </div>
+              );
+            })()}
             <div className="stat" style={{ flexDirection: 'column', gap: 4 }}>
               <span className="label">当日收益</span>
               <span
diff --git a/app/components/HoldingEditModal.jsx b/app/components/HoldingEditModal.jsx
index cfb5a3e..97097c2 100644
--- a/app/components/HoldingEditModal.jsx
+++ b/app/components/HoldingEditModal.jsx
@@ -1,15 +1,27 @@
 'use client';
 
 import { useEffect, useMemo, useRef, useState } from 'react';
-import { CloseIcon, SettingsIcon } from './Icons';
+import dayjs from 'dayjs';
+import utc from 'dayjs/plugin/utc';
+import timezone from 'dayjs/plugin/timezone';
+import { CloseIcon, SettingsIcon, SwitchIcon } from './Icons';
+import { DatePicker } from './Common';
 import {
   Dialog,
   DialogContent,
   DialogTitle,
 } from '@/components/ui/dialog';
 
+dayjs.extend(utc);
+dayjs.extend(timezone);
+
+const TZ = typeof Intl !== 'undefined' && Intl.DateTimeFormat
+  ? (Intl.DateTimeFormat().resolvedOptions().timeZone || 'Asia/Shanghai')
+  : 'Asia/Shanghai';
+
 export default function HoldingEditModal({ fund, holding, onClose, onSave, onOpenTrade }) {
   const [mode, setMode] = useState('amount'); // 'amount' | 'share'
+  const [dateMode, setDateMode] = useState('date'); // 'date' | 'days'
 
   const dwjz = fund?.dwjz || fund?.gsz || 0;
   const dwjzRef = useRef(dwjz);
@@ -21,10 +33,12 @@ export default function HoldingEditModal({ fund, holding, onClose, onSave, onOpe
   const [cost, setCost] = useState('');
   const [amount, setAmount] = useState('');
   const [profit, setProfit] = useState('');
+  const [firstPurchaseDate, setFirstPurchaseDate] = useState('');
+  const [holdingDaysInput, setHoldingDaysInput] = useState('');
 
   const holdingSig = useMemo(() => {
     if (!holding) return '';
-    return `${holding.id ?? ''}|${holding.share ?? ''}|${holding.cost ?? ''}`;
+    return `${holding.id ?? ''}|${holding.share ?? ''}|${holding.cost ?? ''}|${holding.firstPurchaseDate ?? ''}`;
   }, [holding]);
 
   useEffect(() => {
@@ -33,6 +47,14 @@ export default function HoldingEditModal({ fund, holding, onClose, onSave, onOpe
       const c = holding.cost || 0;
       setShare(String(s));
       setCost(String(c));
+      setFirstPurchaseDate(holding.firstPurchaseDate || '');
+
+      if (holding.firstPurchaseDate) {
+        const days = dayjs.tz(undefined, TZ).diff(dayjs.tz(holding.firstPurchaseDate, TZ), 'day');
+        setHoldingDaysInput(days > 0 ? String(days) : '');
+      } else {
+        setHoldingDaysInput('');
+      }
 
       const price = dwjzRef.current;
       if (price > 0) {
@@ -42,7 +64,6 @@ export default function HoldingEditModal({ fund, holding, onClose, onSave, onOpe
         setProfit(p.toFixed(2));
       }
     }
-    // 只在“切换持仓/初次打开”时初始化，避免净值刷新覆盖用户输入
     // eslint-disable-next-line react-hooks/exhaustive-deps
   }, [holdingSig]);
 
@@ -74,6 +95,41 @@ export default function HoldingEditModal({ fund, holding, onClose, onSave, onOpe
     }
   };
 
+  const handleDateModeToggle = () => {
+    const newMode = dateMode === 'date' ? 'days' : 'date';
+    setDateMode(newMode);
+
+    if (newMode === 'days' && firstPurchaseDate) {
+      const days = dayjs.tz(undefined, TZ).diff(dayjs.tz(firstPurchaseDate, TZ), 'day');
+      setHoldingDaysInput(days > 0 ? String(days) : '');
+    } else if (newMode === 'date' && holdingDaysInput) {
+      const days = parseInt(holdingDaysInput, 10);
+      if (Number.isFinite(days) && days >= 0) {
+        const date = dayjs.tz(undefined, TZ).subtract(days, 'day').format('YYYY-MM-DD');
+        setFirstPurchaseDate(date);
+      }
+    }
+  };
+
+  const handleHoldingDaysChange = (value) => {
+    setHoldingDaysInput(value);
+    const days = parseInt(value, 10);
+    if (Number.isFinite(days) && days >= 0) {
+      const date = dayjs.tz(undefined, TZ).subtract(days, 'day').format('YYYY-MM-DD');
+      setFirstPurchaseDate(date);
+    }
+  };
+
+  const handleFirstPurchaseDateChange = (value) => {
+    setFirstPurchaseDate(value);
+    if (value) {
+      const days = dayjs.tz(undefined, TZ).diff(dayjs.tz(value, TZ), 'day');
+      setHoldingDaysInput(days > 0 ? String(days) : '');
+    } else {
+      setHoldingDaysInput('');
+    }
+  };
+
   const handleSubmit = (e) => {
     e.preventDefault();
 
@@ -94,9 +150,12 @@ export default function HoldingEditModal({ fund, holding, onClose, onSave, onOpe
       finalCost = finalShare > 0 ? principal / finalShare : 0;
     }
 
+    const trimmedDate = firstPurchaseDate ? firstPurchaseDate.trim() : '';
+
     onSave({
       share: finalShare,
-      cost: finalCost
+      cost: finalCost,
+      ...(trimmedDate && { firstPurchaseDate: trimmedDate })
     });
     onClose();
   };
@@ -255,6 +314,49 @@ export default function HoldingEditModal({ fund, holding, onClose, onSave, onOpe
             </>
           )}
 
+          <div className="form-group" style={{ marginBottom: 24 }}>
+            <div style={{ display: 'flex', alignItems: 'center', justifyContent: 'space-between', marginBottom: 8 }}>
+              <span className="muted" style={{ fontSize: '14px' }}>
+                {dateMode === 'date' ? '首次买入日期' : '持有天数'}
+              </span>
+              <button
+                type="button"
+                onClick={handleDateModeToggle}
+                style={{
+                  display: 'flex',
+                  alignItems: 'center',
+                  gap: 4,
+                  background: 'rgba(255,255,255,0.06)',
+                  border: 'none',
+                  borderRadius: 6,
+                  padding: '4px 8px',
+                  fontSize: '12px',
+                  color: 'var(--primary)',
+                  cursor: 'pointer',
+                }}
+                title={dateMode === 'date' ? '切换到持有天数' : '切换到日期'}
+              >
+                <SwitchIcon />
+                {dateMode === 'date' ? '按天数' : '按日期'}
+              </button>
+            </div>
+            {dateMode === 'date' ? (
+              <DatePicker value={firstPurchaseDate} onChange={handleFirstPurchaseDateChange} position="top" />
+            ) : (
+              <input
+                type="number"
+                inputMode="numeric"
+                min="0"
+                step="1"
+                className="input"
+                value={holdingDaysInput}
+                onChange={(e) => handleHoldingDaysChange(e.target.value)}
+                placeholder="请输入持有天数"
+                style={{ width: '100%' }}
+              />
+            )}
+          </div>
+
           <div className="row" style={{ gap: 12 }}>
             <button type="button" className="button secondary" onClick={onClose} style={{ flex: 1, background: 'rgba(255,255,255,0.05)', color: 'var(--text)' }}>取消</button>
             <button
diff --git a/app/components/MobileFundTable.jsx b/app/components/MobileFundTable.jsx
index c69dcc1..88b917e 100644
--- a/app/components/MobileFundTable.jsx
+++ b/app/components/MobileFundTable.jsx
@@ -35,6 +35,7 @@ const MOBILE_NON_FROZEN_COLUMN_IDS = [
   'yesterdayChangePercent',
   'estimateChangePercent',
   'totalChangePercent',
+  'holdingDays',
   'todayProfit',
   'holdingProfit',
   'latestNav',
@@ -47,6 +48,7 @@ const MOBILE_COLUMN_HEADERS = {
   yesterdayChangePercent: '昨日涨幅',
   estimateChangePercent: '估值涨幅',
   totalChangePercent: '估算收益',
+  holdingDays: '持有天数',
   todayProfit: '当日收益',
   holdingProfit: '持有收益',
 };
@@ -238,6 +240,7 @@ export default function MobileFundTable({
     MOBILE_NON_FROZEN_COLUMN_IDS.forEach((id) => { o[id] = true; });
     // 新增列：默认隐藏（用户可在表格设置中开启）
     o.relatedSector = false;
+    o.holdingDays = false;
     return o;
   })();
 
@@ -253,6 +256,7 @@ export default function MobileFundTable({
     if (vis && typeof vis === 'object' && Object.keys(vis).length > 0) {
       const next = { ...vis };
       if (next.relatedSector === undefined) next.relatedSector = false;
+      if (next.holdingDays === undefined) next.holdingDays = false;
       return next;
     }
     return defaultVisibility;
@@ -442,6 +446,7 @@ export default function MobileFundTable({
     yesterdayChangePercent: 72,
     estimateChangePercent: 80,
     totalChangePercent: 80,
+    holdingDays: 64,
     todayProfit: 80,
     holdingProfit: 80,
   };
@@ -515,6 +520,7 @@ export default function MobileFundTable({
       allVisible[id] = true;
     });
     allVisible.relatedSector = false;
+    allVisible.holdingDays = false;
     setMobileColumnVisibility(allVisible);
   };
   const handleToggleMobileColumnVisibility = (columnId, visible) => {
@@ -849,6 +855,23 @@ export default function MobileFundTable({
         },
         meta: { align: 'right', cellClassName: 'total-change-cell', width: columnWidthMap.totalChangePercent },
       },
+      {
+        accessorKey: 'holdingDays',
+        header: '持有天数',
+        cell: (info) => {
+          const original = info.row.original || {};
+          const value = original.holdingDaysValue;
+          if (value == null) {
+            return <div className="muted" style={{ textAlign: 'right', fontSize: '12px' }}>—</div>;
+          }
+          return (
+            <div style={{ fontWeight: 700, textAlign: 'right' }}>
+              {value}
+            </div>
+          );
+        },
+        meta: { align: 'right', cellClassName: 'holding-days-cell', width: columnWidthMap.holdingDays ?? 64 },
+      },
       {
         accessorKey: 'todayProfit',
         header: '当日收益',
@@ -1019,7 +1042,7 @@ export default function MobileFundTable({
 
   const getAlignClass = (columnId) => {
     if (columnId === 'fundName') return '';
-    if (['latestNav', 'estimateNav', 'yesterdayChangePercent', 'estimateChangePercent', 'totalChangePercent', 'todayProfit', 'holdingProfit'].includes(columnId)) return 'text-right';
+    if (['latestNav', 'estimateNav', 'yesterdayChangePercent', 'estimateChangePercent', 'totalChangePercent', 'holdingDays', 'todayProfit', 'holdingProfit'].includes(columnId)) return 'text-right';
     return 'text-right';
   };
 
diff --git a/app/components/PcFundTable.jsx b/app/components/PcFundTable.jsx
index 75bf31d..143d686 100644
--- a/app/components/PcFundTable.jsx
+++ b/app/components/PcFundTable.jsx
@@ -43,6 +43,7 @@ const NON_FROZEN_COLUMN_IDS = [
   'estimateChangePercent',
   'totalChangePercent',
   'holdingAmount',
+  'holdingDays',
   'todayProfit',
   'holdingProfit',
   'latestNav',
@@ -57,6 +58,7 @@ const COLUMN_HEADERS = {
   estimateChangePercent: '估值涨幅',
   totalChangePercent: '估算收益',
   holdingAmount: '持仓金额',
+  holdingDays: '持有天数',
   todayProfit: '当日收益',
   holdingProfit: '持有收益',
 };
@@ -289,13 +291,15 @@ export default function PcFundTable({
     if (vis && typeof vis === 'object' && Object.keys(vis).length > 0) {
       const next = { ...vis };
       if (next.relatedSector === undefined) next.relatedSector = false;
+      if (next.holdingDays === undefined) next.holdingDays = false;
       return next;
     }
     const allVisible = {};
     NON_FROZEN_COLUMN_IDS.forEach((id) => { allVisible[id] = true; });
     // 新增列：默认隐藏（用户可在表格设置中开启）
-    allVisible.relatedSector = false;
-    return allVisible;
+      allVisible.relatedSector = false;
+      allVisible.holdingDays = false;
+      return allVisible;
   })();
   const columnSizing = (() => {
     const s = currentGroupPc?.pcTableColumns;
@@ -367,6 +371,7 @@ export default function PcFundTable({
       allVisible[id] = true;
     });
     allVisible.relatedSector = false;
+    allVisible.holdingDays = false;
     setColumnVisibility(allVisible);
   };
   const handleToggleColumnVisibility = (columnId, visible) => {
@@ -849,6 +854,28 @@ export default function PcFundTable({
           cellClassName: 'holding-amount-cell',
         },
       },
+      {
+        accessorKey: 'holdingDays',
+        header: '持有天数',
+        size: 100,
+        minSize: 80,
+        cell: (info) => {
+          const original = info.row.original || {};
+          const value = original.holdingDaysValue;
+          if (value == null) {
+            return <div className="muted" style={{ textAlign: 'right', fontSize: '12px' }}>—</div>;
+          }
+          return (
+            <div style={{ fontWeight: 700, textAlign: 'right' }}>
+              {value}
+            </div>
+          );
+        },
+        meta: {
+          align: 'right',
+          cellClassName: 'holding-days-cell',
+        },
+      },
       {
         accessorKey: 'todayProfit',
         header: '当日收益',
diff --git a/app/page.jsx b/app/page.jsx
index e823118..d4225c5 100644
--- a/app/page.jsx
+++ b/app/page.jsx
@@ -794,6 +794,9 @@ export default function HomePage() {
         const holdingAmount =
           amount == null ? '未设置' : `¥${amount.toFixed(2)}`;
         const holdingAmountValue = amount;
+        const holdingDaysValue = holding?.firstPurchaseDate
+          ? dayjs.tz(todayStr, TZ).diff(dayjs.tz(holding.firstPurchaseDate, TZ), 'day')
+          : null;
 
         const profitToday = profit ? profit.profitToday : null;
         const todayProfit =
@@ -869,6 +872,7 @@ export default function HomePage() {
           estimateProfitPercent,
           holdingAmount,
           holdingAmountValue,
+          holdingDaysValue,
           todayProfit,
           todayProfitPercent,
           todayProfitValue,