feat: improve audit exports and admin analytics

ai_knowledge_base_v2/apps/user-client/src/components/ChatMessage.vue

@@ -2,6 +2,7 @@
 import { Bot, MessageSquareWarning, RotateCcw } from "@lucide/vue";
 import MarkdownIt from "markdown-it";
 import { computed } from "vue";
+import { formatTime } from "../utils/dateTime";
 
 const props = defineProps<{
   messageId: string;
@@ -79,10 +80,7 @@ function splitReasoning(content: string) {
 }
 
 const displayTime = computed(() => {
-  const normalized = /(?:Z|[+-]\d{2}:?\d{2})$/i.test(props.createdAt) ? props.createdAt : `${props.createdAt}Z`;
-  const date = new Date(normalized);
-  if (Number.isNaN(date.getTime())) return "";
-  return new Intl.DateTimeFormat("zh-CN", { hour: "2-digit", minute: "2-digit", hour12: false }).format(date);
+  return formatTime(props.createdAt, "");
 });
 </script>
 

ai_knowledge_base_v2/apps/user-client/src/components/PersonalCenterDialog.vue

@@ -16,6 +16,7 @@ import {
 import { computed, ref, watch } from "vue";
 
 import type { PeriodicReport, PracticeReviewResult, ShareDraft, TeacherHelpCard, UserProfile } from "../types/api";
+import { formatDate } from "../utils/dateTime";
 import AppDialog from "./AppDialog.vue";
 
 type CenterSection = "overview" | "review" | "reports" | "records";
@@ -104,13 +105,6 @@ function usagePercent(used: number, limit: number | null) {
   return Math.min(100, Math.max(0, Math.round((used / limit) * 100)));
 }
 
-function formatDate(value?: string | null) {
-  if (!value) return "长期有效";
-  const date = new Date(value);
-  if (Number.isNaN(date.getTime())) return value;
-  return date.toLocaleDateString("zh-CN", { year: "numeric", month: "2-digit", day: "2-digit" });
-}
-
 function settlementStatusLabel(status: string) {
   return {
     pending: "等待整理",
@@ -189,7 +183,7 @@ function submitDeleteCard() {
             </div>
             <div>
               <dt>有效期至</dt>
-              <dd>{{ formatDate(entitlement?.expiredAt) }}</dd>
+              <dd>{{ formatDate(entitlement?.expiredAt, "长期有效") }}</dd>
             </div>
           </dl>
         </article>

ai_knowledge_base_v2/apps/user-client/src/components/SessionDrawer.vue

@@ -4,6 +4,7 @@ import { computed, ref, watch } from "vue";
 
 import type { ChatSession } from "../types/api";
 import AppDialog from "./AppDialog.vue";
+import { formatSessionTime } from "../utils/dateTime";
 
 const props = defineProps<{
   open: boolean;
@@ -50,18 +51,6 @@ function submitDelete() {
   });
 }
 
-function formatTime(value: string) {
-  const date = new Date(value);
-  if (Number.isNaN(date.getTime())) return "";
-  const now = new Date();
-  const today = new Date(now.getFullYear(), now.getMonth(), now.getDate());
-  const target = new Date(date.getFullYear(), date.getMonth(), date.getDate());
-  const days = Math.round((today.getTime() - target.getTime()) / 86_400_000);
-  const time = new Intl.DateTimeFormat("zh-CN", { hour: "2-digit", minute: "2-digit", hour12: false }).format(date);
-  if (days === 0) return time;
-  if (days === 1) return `昨天 ${time}`;
-  return `${String(date.getMonth() + 1).padStart(2, "0")}/${String(date.getDate()).padStart(2, "0")} ${time}`;
-}
 </script>
 
 <template>
@@ -91,7 +80,7 @@ function formatTime(value: string) {
       >
         <button type="button" class="history-main" @click="emit('select', session.id)">
           <strong>{{ session.title }}</strong>
-          <time :datetime="session.updatedAt">{{ formatTime(session.updatedAt) }}</time>
+          <time :datetime="session.updatedAt">{{ formatSessionTime(session.updatedAt) }}</time>
           <span>{{ session.messageCount }} 条消息</span>
         </button>
         <div class="history-actions">

ai_knowledge_base_v2/apps/user-client/src/components/SessionQuota.vue

@@ -3,6 +3,7 @@ import { Layers3, LoaderCircle } from "@lucide/vue";
 import { computed } from "vue";
 
 import type { UserEntitlementSummary } from "../types/api";
+import { formatDate } from "../utils/dateTime";
 
 const props = defineProps<{
   used: number;
@@ -26,11 +27,6 @@ const usageText = computed(() => {
   if (displayLimit.value <= 0) return "今日不可用";
   return `今日 ${displayUsed.value}/${displayLimit.value} 次`;
 });
-function formatDate(value?: string | null) {
-  if (!value) return "";
-  const date = new Date(value);
-  return Number.isNaN(date.getTime()) ? value : date.toLocaleDateString("zh-CN");
-}
 const guidanceText = computed(() => {
   if (props.entitlement?.lifecycleStatus === "expired_fallback") {
     return `原${props.entitlement.previousPlanName ? `“${props.entitlement.previousPlanName}”` : "权益"}已于 ${formatDate(props.entitlement.previousExpiredAt)} 到期，当前已自动切换为${props.entitlement.name}，已有对话与回顾仍会保留。`;

ai_knowledge_base_v2/apps/user-client/src/utils/dateTime.ts

@@ -0,0 +1,76 @@
+export const BUSINESS_TIME_ZONE = "Asia/Shanghai";
+const BUSINESS_OFFSET = "+08:00";
+const DATE_ONLY_PATTERN = /^\d{4}-\d{2}-\d{2}$/;
+const EXPLICIT_OFFSET_PATTERN = /(?:Z|[+-]\d{2}:?\d{2})$/i;
+
+export function parseApiDateTime(value?: string | Date | null): Date | null {
+  if (!value) return null;
+  if (value instanceof Date) return Number.isNaN(value.getTime()) ? null : value;
+  const text = value.trim();
+  if (!text) return null;
+  const isoText = text.includes(" ") ? text.replace(" ", "T") : text;
+  const normalized = DATE_ONLY_PATTERN.test(isoText)
+    ? `${isoText}T00:00:00${BUSINESS_OFFSET}`
+    : EXPLICIT_OFFSET_PATTERN.test(isoText)
+      ? isoText
+      : `${isoText}Z`;
+  const parsed = new Date(normalized);
+  return Number.isNaN(parsed.getTime()) ? null : parsed;
+}
+
+function businessParts(value?: string | Date | null) {
+  const parsed = parseApiDateTime(value);
+  if (!parsed) return null;
+  const parts = new Intl.DateTimeFormat("zh-CN", {
+    timeZone: BUSINESS_TIME_ZONE,
+    year: "numeric",
+    month: "2-digit",
+    day: "2-digit",
+    hour: "2-digit",
+    minute: "2-digit",
+    second: "2-digit",
+    hour12: false,
+    hourCycle: "h23",
+  }).formatToParts(parsed);
+  return Object.fromEntries(parts.map((part) => [part.type, part.value]));
+}
+
+export function formatDate(value?: string | Date | null, fallback = "-") {
+  const parts = businessParts(value);
+  return parts ? `${parts.year}-${parts.month}-${parts.day}` : fallback;
+}
+
+export function formatTime(value?: string | Date | null, fallback = "-") {
+  const parts = businessParts(value);
+  return parts ? `${parts.hour}:${parts.minute}` : fallback;
+}
+
+export function formatDateTime(value?: string | Date | null, fallback = "-") {
+  const parts = businessParts(value);
+  return parts
+    ? `${parts.year}-${parts.month}-${parts.day} ${parts.hour}:${parts.minute}:${parts.second}`
+    : fallback;
+}
+
+export function businessDateKey(value?: string | Date | null): string | null {
+  const parts = businessParts(value);
+  return parts ? `${parts.year}-${parts.month}-${parts.day}` : null;
+}
+
+export function formatSessionTime(
+  value?: string | Date | null,
+  now: Date = new Date(),
+): string {
+  const targetKey = businessDateKey(value);
+  const todayKey = businessDateKey(now);
+  const time = formatTime(value, "");
+  if (!targetKey || !todayKey || !time) return "";
+  const dayNumber = (key: string) => {
+    const [year, month, day] = key.split("-").map(Number);
+    return Date.UTC(year, month - 1, day) / 86_400_000;
+  };
+  const days = dayNumber(todayKey) - dayNumber(targetKey);
+  if (days === 0) return time;
+  if (days === 1) return `昨天 ${time}`;
+  return `${targetKey.slice(5).replace("-", "/")} ${time}`;
+}