diff --git a/src/modules/mileage/DailyReportView.tsx b/src/modules/mileage/DailyReportView.tsx
index 9da7f24..89a6846 100644
--- a/src/modules/mileage/DailyReportView.tsx
+++ b/src/modules/mileage/DailyReportView.tsx
@@ -83,12 +83,132 @@ function dateShift(date: string, days: number): string {
   return value.toISOString().slice(0, 10);
 }
 
+function monthShift(month: string, months: number): string {
+  const value = new Date(`${month}-01T00:00:00Z`);
+  value.setUTCMonth(value.getUTCMonth() + months);
+  return value.toISOString().slice(0, 7);
+}
+
+function reportDateLabel(value: string): string {
+  const date = new Date(`${value}T00:00:00Z`);
+  return new Intl.DateTimeFormat('zh-CN', {
+    timeZone: 'UTC',
+    year: 'numeric',
+    month: 'long',
+    day: 'numeric',
+    weekday: 'short',
+  }).format(date).replace(/日(?=周)/, '日 ');
+}
+
 function initialReportDate(): string {
   const params = new URLSearchParams(window.location.search);
   const value = params.get('mileageReportDate');
   return /^\d{4}-\d{2}-\d{2}$/.test(value || '') ? value! : shanghaiYmd(-1);
 }
 
+function ReportDatePicker({
+  value,
+  maxDate,
+  onChange,
+}: {
+  value: string;
+  maxDate: string;
+  onChange: (date: string) => void;
+}) {
+  const [open, setOpen] = useState(false);
+  const [month, setMonth] = useState(value.slice(0, 7));
+  const monthStart = new Date(`${month}-01T00:00:00Z`);
+  const firstGridDate = new Date(monthStart);
+  firstGridDate.setUTCDate(1 - monthStart.getUTCDay());
+  const days = Array.from({ length: 42 }, (_, index) => {
+    const date = new Date(firstGridDate);
+    date.setUTCDate(firstGridDate.getUTCDate() + index);
+    return date;
+  });
+  const weekdayLabels = ['日', '一', '二', '三', '四', '五', '六'];
+  const monthLabel = new Intl.DateTimeFormat('zh-CN', {
+    timeZone: 'UTC',
+    year: 'numeric',
+    month: 'long',
+  }).format(monthStart);
+
+  return (
+    <div className="relative min-w-0 flex-1 sm:flex-none">
+      <button
+        type="button"
+        onClick={() => {
+          setMonth(value.slice(0, 7));
+          setOpen(current => !current);
+        }}
+        className="flex h-9 w-full min-w-[190px] items-center gap-2 rounded-lg border border-slate-200 bg-white px-3 text-left text-xs font-black text-slate-700 transition-colors hover:border-blue-200 hover:bg-blue-50/50 sm:w-[208px]"
+        aria-expanded={open}
+        aria-haspopup="dialog"
+        aria-label="选择日报日期"
+      >
+        <CalendarDays size={15} className="shrink-0 text-blue-500" />
+        <span className="min-w-0 flex-1 truncate">{reportDateLabel(value)}</span>
+        <ChevronDown size={14} className={`shrink-0 text-slate-400 transition-transform ${open ? 'rotate-180' : ''}`} />
+      </button>
+
+      {open ? (
+        <div role="dialog" aria-label="日报日期日历" className="absolute right-0 top-full z-40 mt-2 w-[308px] rounded-xl border border-slate-200 bg-white p-3 shadow-xl">
+          <div className="mb-3 flex items-center justify-between">
+            <button
+              type="button"
+              onClick={() => setMonth(current => monthShift(current, -1))}
+              className="flex h-8 w-8 items-center justify-center rounded-md text-slate-500 hover:bg-slate-100"
+              title="上个月"
+              aria-label="上个月"
+            >
+              <ChevronLeft size={16} />
+            </button>
+            <div className="text-sm font-black text-slate-900">{monthLabel}</div>
+            <button
+              type="button"
+              onClick={() => setMonth(current => monthShift(current, 1))}
+              disabled={month >= maxDate.slice(0, 7)}
+              className="flex h-8 w-8 items-center justify-center rounded-md text-slate-500 hover:bg-slate-100 disabled:cursor-not-allowed disabled:opacity-30"
+              title="下个月"
+              aria-label="下个月"
+            >
+              <ChevronRight size={16} />
+            </button>
+          </div>
+          <div className="grid grid-cols-7 gap-1 text-center">
+            {weekdayLabels.map(day => <span key={day} className="py-1 text-[10px] font-black text-slate-400">{day}</span>)}
+            {days.map(date => {
+              const dateValue = date.toISOString().slice(0, 10);
+              const inMonth = dateValue.slice(0, 7) === month;
+              const selected = dateValue === value;
+              const disabled = dateValue > maxDate;
+              return (
+                <button
+                  key={dateValue}
+                  type="button"
+                  disabled={disabled}
+                  onClick={() => {
+                    onChange(dateValue);
+                    setOpen(false);
+                  }}
+                  className={`flex h-9 items-center justify-center rounded-md text-xs font-black transition-colors ${
+                    selected
+                      ? 'bg-blue-600 text-white shadow-sm'
+                      : inMonth
+                        ? 'text-slate-700 hover:bg-blue-50 hover:text-blue-600'
+                        : 'text-slate-300 hover:bg-slate-50'
+                  } disabled:cursor-not-allowed disabled:text-slate-200 disabled:hover:bg-transparent`}
+                >
+                  {date.getUTCDate()}
+                </button>
+              );
+            })}
+          </div>
+        </div>
+      ) : null}
+    </div>
+  );
+}
+
 function updateReportDateInUrl(date: string): void {
   const url = new URL(window.location.href);
   url.searchParams.set('mileageReportDate', date);
@@ -711,7 +831,7 @@ function roundMileageForDisplay(value: number): number {
 }
 
 export default function DailyReportView() {
-  const maxDate = shanghaiYmd(-1);
+  const maxDate = shanghaiYmd();
   const [selectedDate, setSelectedDate] = useState(initialReportDate);
   const [report, setReport] = useState<DailyMileageReport | null>(null);
   const [loading, setLoading] = useState(true);
@@ -777,10 +897,12 @@ export default function DailyReportView() {
             <p className="mt-1 text-[10px] font-bold text-slate-400">
               {fmtDate(report.reportDate)} · {report.source === 'XLSX_IMPORT'
                 ? '人工台账归档'
-                : `仪表数据更新至 ${fmtDateTime(report.sourceUpdatedAt)}`}
+                : report.status === 'ARCHIVED'
+                  ? `归档于 ${fmtDateTime(report.generatedAt)}`
+                  : `仪表数据更新至 ${fmtDateTime(report.sourceUpdatedAt)}`}
             </p>
             <p className="mt-1 text-[10px] font-bold text-slate-500">
-              统计口径：每天 00:30 自动汇总前一日里程
+              统计周期：自然日 · 汇总频率：每日 00:30 汇总前一日里程
             </p>
           </div>
 
@@ -794,17 +916,16 @@ export default function DailyReportView() {
             >
               <ChevronLeft size={16} />
             </button>
-            <label className="flex h-9 min-w-0 flex-1 items-center gap-2 rounded-lg border border-slate-200 bg-white px-3 sm:flex-none">
-              <CalendarDays size={15} className="shrink-0 text-blue-500" />
-              <input
-                type="date"
-                max={maxDate}
-                value={selectedDate}
-                onChange={event => event.target.value && setSelectedDate(event.target.value)}
-                className="min-w-0 border-0 bg-transparent text-xs font-black text-slate-700 outline-none"
-                aria-label="日报日期"
-              />
-            </label>
+            <ReportDatePicker value={selectedDate} maxDate={maxDate} onChange={setSelectedDate} />
+            <button
+              type="button"
+              onClick={() => setSelectedDate(maxDate)}
+              disabled={selectedDate === maxDate}
+              className="flex h-9 shrink-0 items-center justify-center rounded-lg border border-slate-200 bg-white px-2.5 text-[11px] font-black text-blue-600 hover:border-blue-200 hover:bg-blue-50 disabled:cursor-not-allowed disabled:opacity-35"
+              title="回到今天"
+            >
+              今天
+            </button>
             <button
               type="button"
               onClick={() => setSelectedDate(dateShift(selectedDate, 1))}
diff --git a/src/server/routes/mileage/daily-report-scheduler.ts b/src/server/routes/mileage/daily-report-scheduler.ts
index cfeff7a..8876c46 100644
--- a/src/server/routes/mileage/daily-report-scheduler.ts
+++ b/src/server/routes/mileage/daily-report-scheduler.ts
@@ -3,6 +3,7 @@ import { hasDailyReportSnapshot } from './daily-report-store.js';
 
 const FIRST_CHECK_DELAY_MS = 15 * 1000;
 const SUMMARY_MINUTE_OF_DAY = 30;
+const SUMMARY_WINDOW_MINUTES = 5;
 let archiving = false;
 
 function shanghaiMinuteOfDay(): number {
@@ -39,7 +40,12 @@ function millisecondsUntilNextSummary(): number {
 }
 
 async function checkAndArchive(): Promise<void> {
-  if (archiving || shanghaiMinuteOfDay() < SUMMARY_MINUTE_OF_DAY) return;
+  const minuteOfDay = shanghaiMinuteOfDay();
+  if (
+    archiving
+    || minuteOfDay < SUMMARY_MINUTE_OF_DAY
+    || minuteOfDay >= SUMMARY_MINUTE_OF_DAY + SUMMARY_WINDOW_MINUTES
+  ) return;
   const reportDate = previousShanghaiDate();
   archiving = true;
   try {