diff --git a/src/components/business/CommentItem.tsx b/src/components/business/CommentItem.tsx
index c0b4c45..d5f781f 100644
--- a/src/components/business/CommentItem.tsx
+++ b/src/components/business/CommentItem.tsx
@@ -223,8 +223,11 @@ const CommentItem: React.FC<CommentItemProps> = ({
   const [isDeleting, setIsDeleting] = useState(false);
   // 格式化时间
   const formatTime = (dateString: string): string => {
+    if (!dateString) return '';
     try {
-      return formatDistanceToNow(new Date(dateString), {
+      const date = new Date(dateString);
+      if (Number.isNaN(date.getTime())) return '';
+      return formatDistanceToNow(date, {
         addSuffix: true,
         locale: zhCN,
       });
diff --git a/src/components/business/SystemMessageItem.tsx b/src/components/business/SystemMessageItem.tsx
index 094d4af..87a9fbb 100644
--- a/src/components/business/SystemMessageItem.tsx
+++ b/src/components/business/SystemMessageItem.tsx
@@ -331,8 +331,11 @@ const SystemMessageItem: React.FC<SystemMessageItemProps> = ({
 
   // 格式化时间
   const formatTime = (dateString: string): string => {
+    if (!dateString) return '';
     try {
-      return formatDistanceToNow(new Date(dateString), {
+      const date = new Date(dateString);
+      if (Number.isNaN(date.getTime())) return '';
+      return formatDistanceToNow(date, {
         addSuffix: true,
         locale: zhCN,
       });
diff --git a/src/components/business/UserProfileHeader.tsx b/src/components/business/UserProfileHeader.tsx
index 0b4e81b..f68ecc7 100644
--- a/src/components/business/UserProfileHeader.tsx
+++ b/src/components/business/UserProfileHeader.tsx
@@ -274,8 +274,11 @@ const UserProfileHeader: React.FC<UserProfileHeaderProps> = ({
           <View style={styles.metaItem}>
             <MaterialCommunityIcons name="calendar-outline" size={14} color={colors.text.hint} />
             <Text style={styles.metaText}>
-              加入于 {new Date(user.created_at || Date.now()).getFullYear()}年
-              {new Date(user.created_at || Date.now()).getMonth() + 1}月
+              {(() => {
+                const d = new Date(user.created_at || Date.now());
+                if (Number.isNaN(d.getTime())) return '加入于 未知时间';
+                return `加入于 ${d.getFullYear()}年${d.getMonth() + 1}月`;
+              })()}
             </Text>
           </View>
         </View>
diff --git a/src/screens/message/GroupInfoScreen.tsx b/src/screens/message/GroupInfoScreen.tsx
index 54fa78d..2321602 100644
--- a/src/screens/message/GroupInfoScreen.tsx
+++ b/src/screens/message/GroupInfoScreen.tsx
@@ -661,7 +661,10 @@ const GroupInfoScreen: React.FC = () => {
                 {announcements[0].content}
               </Text>
               <Text variant="caption" color={colors.text.hint} style={styles.announcementTime}>
-                {new Date(announcements[0].created_at).toLocaleDateString()}
+                {(() => {
+                  const d = new Date(announcements[0].created_at);
+                  return Number.isNaN(d.getTime()) ? '' : d.toLocaleDateString();
+                })()}
               </Text>
             </View>
           </View>
diff --git a/src/screens/message/MessageListScreen.tsx b/src/screens/message/MessageListScreen.tsx
index b7d5eab..344c0ab 100644
--- a/src/screens/message/MessageListScreen.tsx
+++ b/src/screens/message/MessageListScreen.tsx
@@ -245,8 +245,10 @@ export const MessageListScreen: React.FC = () => {
 
   // 格式化时间（稳定引用，配合会话行 memo）
   const formatTime = useCallback((dateString: string): string => {
+    if (!dateString) return '';
     try {
       const date = new Date(dateString);
+      if (Number.isNaN(date.getTime())) return '';
       const now = new Date();
       const diffInHours = (now.getTime() - date.getTime()) / (1000 * 60 * 60);
 
@@ -483,7 +485,10 @@ export const MessageListScreen: React.FC = () => {
     const aPinned = a.is_pinned ? 1 : 0;
     const bPinned = b.is_pinned ? 1 : 0;
     if (aPinned !== bPinned) return bPinned - aPinned;
-    return new Date(b.updated_at).getTime() - new Date(a.updated_at).getTime();
+    const aTime = new Date(a.updated_at || 0).getTime();
+    const bTime = new Date(b.updated_at || 0).getTime();
+    if (Number.isNaN(aTime) || Number.isNaN(bTime)) return 0;
+    return bTime - aTime;
   });
 
   const listConvRef = useRef(new Map<string, ConversationResponse>());
diff --git a/src/screens/message/components/ChatScreen/GroupInfoPanel.tsx b/src/screens/message/components/ChatScreen/GroupInfoPanel.tsx
index 52d3c8f..8c6f42c 100644
--- a/src/screens/message/components/ChatScreen/GroupInfoPanel.tsx
+++ b/src/screens/message/components/ChatScreen/GroupInfoPanel.tsx
@@ -241,7 +241,10 @@ export const GroupInfoPanel: React.FC<GroupInfoPanelProps> = ({
               <View style={styles.noticeBox}>
                 <Text style={styles.noticeText}>{announcements[0].content}</Text>
                 <Text style={styles.noticeTime}>
-                  {new Date(announcements[0].created_at).toLocaleDateString()}
+                  {(() => {
+                    const d = new Date(announcements[0].created_at);
+                    return Number.isNaN(d.getTime()) ? '' : d.toLocaleDateString();
+                  })()}
                 </Text>
               </View>
             </View>
@@ -311,7 +314,10 @@ export const GroupInfoPanel: React.FC<GroupInfoPanelProps> = ({
               <Text style={styles.infoLabel}>创建时间</Text>
               <Text style={styles.infoValue}>
                 {groupInfo?.created_at
-                  ? new Date(groupInfo.created_at).toLocaleDateString('zh-CN')
+                  ? (() => {
+                      const d = new Date(groupInfo.created_at);
+                      return Number.isNaN(d.getTime()) ? '-' : d.toLocaleDateString('zh-CN');
+                    })()
                   : '-'}
               </Text>
             </View>
diff --git a/src/screens/message/components/ChatScreen/GroupInfoPanel.web.tsx b/src/screens/message/components/ChatScreen/GroupInfoPanel.web.tsx
index 939f995..ee30172 100644
--- a/src/screens/message/components/ChatScreen/GroupInfoPanel.web.tsx
+++ b/src/screens/message/components/ChatScreen/GroupInfoPanel.web.tsx
@@ -246,7 +246,10 @@ export const GroupInfoPanel: React.FC<GroupInfoPanelProps> = ({
               <View style={styles.noticeBox}>
                 <Text style={styles.noticeText}>{announcements[0].content}</Text>
                 <Text style={styles.noticeTime}>
-                  {new Date(announcements[0].created_at).toLocaleDateString()}
+                  {(() => {
+                    const d = new Date(announcements[0].created_at);
+                    return Number.isNaN(d.getTime()) ? '' : d.toLocaleDateString();
+                  })()}
                 </Text>
               </View>
             </View>
@@ -316,7 +319,10 @@ export const GroupInfoPanel: React.FC<GroupInfoPanelProps> = ({
               <Text style={styles.infoLabel}>创建时间</Text>
               <Text style={styles.infoValue}>
                 {groupInfo?.created_at
-                  ? new Date(groupInfo.created_at).toLocaleDateString('zh-CN')
+                  ? (() => {
+                      const d = new Date(groupInfo.created_at);
+                      return Number.isNaN(d.getTime()) ? '-' : d.toLocaleDateString('zh-CN');
+                    })()
                   : '-'}
               </Text>
             </View>
diff --git a/src/screens/message/components/ChatScreen/LongPressMenu.tsx b/src/screens/message/components/ChatScreen/LongPressMenu.tsx
index eef96b5..bbe7ace 100644
--- a/src/screens/message/components/ChatScreen/LongPressMenu.tsx
+++ b/src/screens/message/components/ChatScreen/LongPressMenu.tsx
@@ -78,10 +78,12 @@ export const LongPressMenu: React.FC<LongPressMenuProps> = ({
   if (!message) return null;
 
   const isMyMessage = message.sender_id === currentUserId;
-  const messageTime = new Date(message.created_at).getTime();
+  const messageDate = new Date(message.created_at);
+  const messageTime = Number.isNaN(messageDate.getTime()) ? 0 : messageDate.getTime();
   const now = Date.now();
   const canRecall = isMyMessage &&
                     message.status !== 'recalled' &&
+                    messageTime > 0 &&
                     (now - messageTime) < RECALL_TIME_LIMIT;
 
   // 检查是否是图片消息
diff --git a/src/screens/message/components/ChatScreen/MessageBubble.tsx b/src/screens/message/components/ChatScreen/MessageBubble.tsx
index a9aaefc..2ec28da 100644
--- a/src/screens/message/components/ChatScreen/MessageBubble.tsx
+++ b/src/screens/message/components/ChatScreen/MessageBubble.tsx
@@ -426,10 +426,10 @@ const MessageBubbleInner: React.FC<MessageBubbleProps> = ({
           
           <View style={[styles.messageContent, isMe ? styles.myMessageContentPanel : null]}>
             {/* 群聊模式：显示发送者昵称 */}
-            {isGroupChat && !isMe && senderInfo && (
-              <Text style={styles.senderName}>{senderInfo.nickname}</Text>
+            {isGroupChat && senderInfo && (
+              <Text style={[styles.senderName, isMe && styles.mySenderName]}>{senderInfo.nickname}</Text>
             )}
-            
+
             {renderMessageContent()}
             
             {/* 私聊模式：显示已读标记 */}
diff --git a/src/screens/message/components/ChatScreen/styles.ts b/src/screens/message/components/ChatScreen/styles.ts
index 88b0bb0..f0b3249 100644
--- a/src/screens/message/components/ChatScreen/styles.ts
+++ b/src/screens/message/components/ChatScreen/styles.ts
@@ -262,14 +262,13 @@ export function createChatScreenStyles(colors: AppColors, dynamicStyles?: {
   messageRow: {
     flexDirection: 'row',
     marginBottom: spacing.md,
-    alignItems: 'flex-end',
+    alignItems: 'flex-start',
   },
   myMessageRow: {
     justifyContent: 'flex-end',
   },
   theirMessageRow: {
     justifyContent: 'flex-start',
-    alignItems: 'flex-start',
   },
   
   // 头像 - 更大一点
@@ -303,6 +302,11 @@ export function createChatScreenStyles(colors: AppColors, dynamicStyles?: {
     marginLeft: 4,
     fontWeight: '600',
   },
+  mySenderName: {
+    marginLeft: 0,
+    marginRight: 4,
+    alignSelf: 'flex-end',
+  },
   
   // 消息气泡 - 动态圆角支持
   messageBubbleOuter: {
@@ -315,7 +319,7 @@ export function createChatScreenStyles(colors: AppColors, dynamicStyles?: {
     elevation: 1,
   },
   myBubbleOuter: {
-    borderBottomRightRadius: Math.max(4, messageRadius * 0.3),  // 微信的小尾巴更尖
+    borderTopRightRadius: Math.max(4, messageRadius * 0.3),  // 箭头在右上
   },
   theirBubbleOuter: {
     borderTopLeftRadius: Math.max(4, messageRadius * 0.3),
@@ -330,7 +334,7 @@ export function createChatScreenStyles(colors: AppColors, dynamicStyles?: {
   },
   myBubbleInner: {
     backgroundColor: myBubbleBg,
-    borderBottomRightRadius: Math.max(4, messageRadius * 0.3),
+    borderTopRightRadius: Math.max(4, messageRadius * 0.3),
   },
   theirBubbleInner: {
     backgroundColor: theirBubbleBg,
@@ -394,7 +398,7 @@ export function createChatScreenStyles(colors: AppColors, dynamicStyles?: {
     elevation: 4,
   },
   myImageBubble: {
-    borderBottomRightRadius: 8,
+    borderTopRightRadius: 8,
   },
   theirImageBubble: {
     borderTopLeftRadius: 8,
diff --git a/src/screens/message/components/ChatScreen/useChatScreen.ts b/src/screens/message/components/ChatScreen/useChatScreen.ts
index 9522eeb..0031600 100644
--- a/src/screens/message/components/ChatScreen/useChatScreen.ts
+++ b/src/screens/message/components/ChatScreen/useChatScreen.ts
@@ -657,8 +657,10 @@ export const useChatScreen = (props?: ChatScreenProps) => {
 
   // 格式化时间
   const formatTime = useCallback((dateString: string): string => {
+    if (!dateString) return '';
     try {
       const date = new Date(dateString);
+      if (Number.isNaN(date.getTime())) return '';
       const now = new Date();
       const diffInHours = (now.getTime() - date.getTime()) / (1000 * 60 * 60);
 
@@ -680,9 +682,10 @@ export const useChatScreen = (props?: ChatScreenProps) => {
     if (index === 0) return true;
     const currentMsg = messages[index];
     const prevMsg = messages[index - 1];
-    const currentTime = new Date(currentMsg.created_at).getTime();
-    const prevTime = new Date(prevMsg.created_at).getTime();
-    return (currentTime - prevTime) > TIME_SEPARATOR_INTERVAL;
+    const currentDate = new Date(currentMsg.created_at);
+    const prevDate = new Date(prevMsg.created_at);
+    if (Number.isNaN(currentDate.getTime()) || Number.isNaN(prevDate.getTime())) return false;
+    return (currentDate.getTime() - prevDate.getTime()) > TIME_SEPARATOR_INTERVAL;
   }, [messages]);
 
   // 处理输入变化，检测@符号
diff --git a/src/screens/message/components/ConversationListRow.tsx b/src/screens/message/components/ConversationListRow.tsx
index 5ce9ebb..a83a4af 100644
--- a/src/screens/message/components/ConversationListRow.tsx
+++ b/src/screens/message/components/ConversationListRow.tsx
@@ -223,14 +223,7 @@ function createConversationRowStyles(colors: AppColors) {
       width: 56,
       height: 56,
     },
-    groupAvatarPlaceholder: {
-      width: 56,
-      height: 56,
-      borderRadius: borderRadius.md,
-      backgroundColor: colors.primary.main,
-      alignItems: 'center',
-      justifyContent: 'center',
-    },
+
     timeText: {
       color: colors.text.hint,
       fontSize: 12,
@@ -324,13 +317,7 @@ const ConversationListRowInner: React.FC<ConversationListRowProps> = ({
           </View>
         ) : isGroupChat ? (
           <View style={styles.groupAvatar}>
-            {displayAvatar ? (
-              <Avatar source={displayAvatar} size={56} name={displayName} />
-            ) : (
-              <View style={styles.groupAvatarPlaceholder}>
-                <MaterialCommunityIcons name="account-group" size={28} color={colors.primary.contrast} />
-              </View>
-            )}
+            <Avatar source={displayAvatar} size={56} name={displayNameRaw || '群'} />
           </View>
         ) : (
           <Avatar source={displayAvatar} size={56} name={displayName} />
diff --git a/src/stores/message/services/WSMessageHandler.ts b/src/stores/message/services/WSMessageHandler.ts
index c1ce9dd..fa4260a 100644
--- a/src/stores/message/services/WSMessageHandler.ts
+++ b/src/stores/message/services/WSMessageHandler.ts
@@ -137,7 +137,9 @@ export class WSMessageHandler implements IWSMessageHandler {
       if (message.created_at) {
         const store = useMessageStore.getState();
         const currentLast = store.lastSystemMessageAt;
-        if (!currentLast || new Date(message.created_at) > new Date(currentLast)) {
+        const msgDate = new Date(message.created_at);
+        if (Number.isNaN(msgDate.getTime())) return;
+        if (!currentLast || msgDate > new Date(currentLast)) {
           store.setLastSystemMessageAt(message.created_at);
         }
       }
@@ -335,7 +337,7 @@ export class WSMessageHandler implements IWSMessageHandler {
       content: textContent,
       type: segments?.find((s: any) => s.type === 'image') ? 'image' : 'text',
       isRead: isActiveConversation,
-      createdAt: new Date(created_at).toISOString(),
+      createdAt: (() => { const d = new Date(created_at); return Number.isNaN(d.getTime()) ? new Date().toISOString() : d.toISOString(); })(),
       seq,
       status: 'normal',
       segments,
@@ -451,7 +453,7 @@ export class WSMessageHandler implements IWSMessageHandler {
               : [],
             status: 'normal',
             category: 'notification',
-            created_at: new Date(timestamp || Date.now()).toISOString(),
+            created_at: (() => { const d = new Date(timestamp || Date.now()); return Number.isNaN(d.getTime()) ? new Date().toISOString() : d.toISOString(); })(),
           };
 
           const updatedMessages = [...existingMessages, systemNoticeMessage].sort((a, b) => a.seq - b.seq);
diff --git a/src/stores/message/store.ts b/src/stores/message/store.ts
index abba7e0..b7ff030 100644
--- a/src/stores/message/store.ts
+++ b/src/stores/message/store.ts
@@ -134,6 +134,7 @@ function sortConversationList(conversations: Map<string, ConversationResponse>):
     }
     const aTime = new Date(a.last_message_at || a.updated_at || 0).getTime();
     const bTime = new Date(b.last_message_at || b.updated_at || 0).getTime();
+    if (Number.isNaN(aTime) || Number.isNaN(bTime)) return 0;
     return bTime - aTime;
   });
 }