diff --git a/astrbot/core/db/po.py b/astrbot/core/db/po.py
index 8fb14c19..d6621d07 100644
--- a/astrbot/core/db/po.py
+++ b/astrbot/core/db/po.py
@@ -162,7 +162,7 @@ class PlatformSession(SQLModel, table=True):
     Each session can have multiple conversations (对话) associated with it.
     """
 
-    __tablename__ = "platform_sessions"
+    __tablename__ = "platform_sessions"  # type: ignore
 
     inner_id: int | None = Field(
         primary_key=True,
diff --git a/astrbot/core/db/sqlite.py b/astrbot/core/db/sqlite.py
index 4a7f2560..19461861 100644
--- a/astrbot/core/db/sqlite.py
+++ b/astrbot/core/db/sqlite.py
@@ -1,7 +1,7 @@
 import asyncio
 import threading
 import typing as T
-from datetime import datetime, timedelta
+from datetime import datetime, timedelta, timezone
 
 from sqlalchemy.ext.asyncio import AsyncSession
 from sqlmodel import col, delete, desc, func, or_, select, text, update
@@ -788,13 +788,13 @@ class SQLiteDatabase(BaseDatabase):
         async with self.get_db() as session:
             session: AsyncSession
             async with session.begin():
-                values = {"updated_at": datetime.now()}
+                values: dict[str, T.Any] = {"updated_at": datetime.now(timezone.utc)}
                 if display_name is not None:
                     values["display_name"] = display_name
 
                 await session.execute(
                     update(PlatformSession)
-                    .where(PlatformSession.session_id == session_id)
+                    .where(col(PlatformSession.session_id == session_id))
                     .values(**values),
                 )
 
@@ -805,6 +805,6 @@ class SQLiteDatabase(BaseDatabase):
             async with session.begin():
                 await session.execute(
                     delete(PlatformSession).where(
-                        PlatformSession.session_id == session_id,
+                        col(PlatformSession.session_id == session_id),
                     ),
                 )
diff --git a/astrbot/dashboard/routes/chat.py b/astrbot/dashboard/routes/chat.py
index 2620f1a1..1ad78956 100644
--- a/astrbot/dashboard/routes/chat.py
+++ b/astrbot/dashboard/routes/chat.py
@@ -334,8 +334,8 @@ class ChatRoute(Route):
                     "creator": session.creator,
                     "display_name": session.display_name,
                     "is_group": session.is_group,
-                    "created_at": int(session.created_at.timestamp()),
-                    "updated_at": int(session.updated_at.timestamp()),
+                    "created_at": session.created_at.astimezone().isoformat(),
+                    "updated_at": session.updated_at.astimezone().isoformat(),
                 }
             )
 
diff --git a/dashboard/src/components/chat/ConversationSidebar.vue b/dashboard/src/components/chat/ConversationSidebar.vue
index 2ea9a481..b2ebd3fe 100644
--- a/dashboard/src/components/chat/ConversationSidebar.vue
+++ b/dashboard/src/components/chat/ConversationSidebar.vue
@@ -54,7 +54,7 @@
                             {{ item.display_name || tm('conversation.newConversation') }}
                         </v-list-item-title>
                         <v-list-item-subtitle v-if="!sidebarCollapsed || isMobile" class="timestamp">
-                            {{ formatDate(item.updated_at) }}
+                            {{ new Date(item.updated_at).toLocaleString() }}
                         </v-list-item-subtitle>
 
                         <template v-if="!sidebarCollapsed || isMobile" v-slot:append>
@@ -159,21 +159,6 @@ function handleSidebarMouseLeave() {
     }
     sidebarHoverExpanded.value = false;
 }
-
-function formatDate(timestamp: number): string {
-    const date = new Date(timestamp * 1000);
-    const options: Intl.DateTimeFormatOptions = {
-        year: 'numeric',
-        month: '2-digit',
-        day: '2-digit',
-        hour: '2-digit',
-        minute: '2-digit',
-        second: '2-digit',
-        hour12: false
-    };
-    const locale = t('core.common.locale') || 'zh-CN';
-    return date.toLocaleString(locale, options).replace(/\//g, '-').replace(/, /g, ' ');
-}
 </script>
 
 <style scoped>
diff --git a/dashboard/src/composables/useSessions.ts b/dashboard/src/composables/useSessions.ts
index 860668a9..f14e3aa1 100644
--- a/dashboard/src/composables/useSessions.ts
+++ b/dashboard/src/composables/useSessions.ts
@@ -5,7 +5,7 @@ import { useRouter } from 'vue-router';
 export interface Session {
     session_id: string;
     display_name: string;
-    updated_at: number;
+    updated_at: string;
 }
 
 export function useSessions(chatboxMode: boolean = false) {