feat: integrate timezone support for message timestamps in chat and overlay components

backend/src/ingestion/youtubei.ts

@@ -64,6 +64,11 @@ export async function bootstrapInnertube(videoId: string): Promise<IngestionCont
   const emitter: ChatEventEmitter = new EventEmitter();
 
   liveChat.on('chat-update', (action: any) => {
+    // Log the complete raw action data from YouTube (commented out for production)
+    // console.log('=== YOUTUBE RAW MESSAGE DATA ===');
+    // console.log('Action type:', action?.type);
+    // console.log('Complete action object:', JSON.stringify(action, null, 2));
+    
     const normalized = normalizeAction(action);
     if (normalized) {
       emitter.emit('message', normalized);
@@ -156,8 +161,23 @@ function resolveTimestamp(timestamp: number | string | undefined): string {
   }
 
   const numeric = typeof timestamp === 'string' ? Number(timestamp) : timestamp;
+  
   if (Number.isFinite(numeric)) {
-    const millis = numeric > 1e12 ? numeric / 1000 : numeric;
+    // YouTube timestamps are in microseconds (16 digits) or milliseconds (13 digits)
+    // If it's microseconds (>= 1e15), divide by 1000 to get milliseconds
+    // If it's milliseconds (>= 1e12), use as is
+    let millis: number;
+    if (numeric >= 1e15) {
+      // Microseconds - convert to milliseconds
+      millis = numeric / 1000;
+    } else if (numeric >= 1e12) {
+      // Already milliseconds
+      millis = numeric;
+    } else {
+      // Fallback for smaller numbers
+      millis = numeric;
+    }
+    
     return new Date(millis).toISOString();
   }
 
@@ -389,6 +409,9 @@ function normalizeAction(action: any): ChatMessage | null {
       ? (item.header_subtext?.text || item.header_primary_text?.text || '')
       : '';
 
+    // Use timestamp_usec (microseconds) as it's more accurate than timestamp (milliseconds)
+    const timestampToUse = item.timestamp_usec ?? item.timestamp;
+
     return {
       id: String(item.id ?? item.timestamp_usec ?? Date.now()),
       author: authorName,
@@ -396,7 +419,7 @@ function normalizeAction(action: any): ChatMessage | null {
       authorChannelId: authorChannelId ? String(authorChannelId) : undefined,
       text: resolvedText || membershipFallbackText,
       runs: (() => { const r = resolveMessageRuns(item); return r.length ? r : undefined; })(),
-      publishedAt: resolveTimestamp(item.timestamp ?? item.timestamp_usec),
+      publishedAt: resolveTimestamp(timestampToUse),
       badges: badges.length > 0 ? badges : undefined,
       isModerator,
       isMember,

client/app/dashboard/page.tsx

@@ -2,6 +2,8 @@
 
 import { useCallback, useEffect, useMemo, useState, useRef } from 'react';
 import type { ChatMessage } from '@shared/chat';
+import { useTimezone } from '../../lib/TimezoneContext';
+import { formatTimestamp } from '../../lib/timezone';
 
 // URL regex for detecting links (http/https)
 const URL_REGEX = /(https?:\/\/[^\s]+)/gi;
@@ -582,6 +584,8 @@ function ChatListPanel({ messages, renderItem, emptyState }: ChatListPanelProps)
 }
 
 function ChatItem({ message, isSelected, onSelect, onLinkClick }: ChatItemProps) {
+  const { timezone } = useTimezone();
+  
   return (
     <button
       className={isSelected ? 'chatItem chatItem--active' : 'chatItem'}
@@ -614,7 +618,7 @@ function ChatItem({ message, isSelected, onSelect, onLinkClick }: ChatItemProps)
               </span>
             )}
           </div>
-          <time className="chatItem__time">{new Date(message.publishedAt).toLocaleTimeString()}</time>
+          <time className="chatItem__time">{formatTimestamp(message.publishedAt, timezone)}</time>
         </div>
       </div>
       {message.runs?.length ? (
@@ -637,6 +641,8 @@ function ChatItem({ message, isSelected, onSelect, onLinkClick }: ChatItemProps)
 }
 
 function MemberItem({ message, isSelected, onSelect, onLinkClick }: ChatItemProps) {
+  const { timezone } = useTimezone();
+  
   return (
     <button
       className={isSelected ? 'memberItem memberItem--active' : 'memberItem'}
@@ -653,7 +659,7 @@ function MemberItem({ message, isSelected, onSelect, onLinkClick }: ChatItemProp
               ? `Sent ${message.giftCount} gift membership${message.giftCount > 1 ? 's' : ''}`
               : message.membershipLevel || 'New member'}
           </span>
-          <time className="memberItem__time">{new Date(message.publishedAt).toLocaleTimeString()}</time>
+          <time className="memberItem__time">{formatTimestamp(message.publishedAt, timezone)}</time>
         </div>
       </div>
       {message.runs?.length ? (

client/app/globals.css

@@ -1241,6 +1241,14 @@ main {
   word-break: break-word;
 }
 
+.overlay__timestamp {
+  font-size: 0.8rem;
+  color: rgba(255, 255, 255, 0.7);
+  font-weight: 400;
+  margin-left: auto;
+  white-space: nowrap;
+}
+
 .overlay__placeholder {
   padding: 1rem 1.4rem;
   border-radius: 12px;

client/app/layout.tsx

@@ -1,5 +1,6 @@
 import './globals.css';
 import type { ReactNode } from 'react';
+import { TimezoneProvider } from '../lib/TimezoneContext';
 
 export const metadata = {
   title: 'YouTube Chat Client',
@@ -9,7 +10,11 @@ export const metadata = {
 export default function RootLayout({ children }: { children: ReactNode }) {
   return (
     <html lang="en">
-      <body>{children}</body>
+      <body>
+        <TimezoneProvider>
+          {children}
+        </TimezoneProvider>
+      </body>
     </html>
   );
 }

client/app/overlay/page.tsx

@@ -2,6 +2,8 @@
 
 import { useEffect, useState, useRef } from 'react';
 import type { ChatMessage } from '@shared/chat';
+import { useTimezone } from '../../lib/TimezoneContext';
+import { formatTimestamp } from '../../lib/timezone';
 
 const BACKEND_URL = process.env.NEXT_PUBLIC_BACKEND_URL ?? 'http://localhost:4100';
 
@@ -14,6 +16,7 @@ export default function OverlayPage() {
   const [connected, setConnected] = useState(false);
   const [fadingOut, setFadingOut] = useState(false);
   const connectionRef = useRef<EventSource | null>(null);
+  const { timezone } = useTimezone();
 
   useEffect(() => {
     // Prevent multiple connections
@@ -143,6 +146,7 @@ export default function OverlayPage() {
                         </span>
                       )
                     ))}
+                    <time className="overlay__timestamp">{formatTimestamp(message.publishedAt, timezone)}</time>
                   </div>
                 </div>
               </div>

client/lib/TimezoneContext.tsx

@@ -0,0 +1,43 @@
+'use client';
+
+import React, { createContext, useContext, useState, useEffect } from 'react';
+import { getBrowserTimezone } from './timezone';
+
+interface TimezoneContextType {
+  timezone: string;
+  setTimezone: (timezone: string) => void;
+}
+
+const TimezoneContext = createContext<TimezoneContextType | undefined>(undefined);
+
+export function TimezoneProvider({ children }: { children: React.ReactNode }) {
+  // Initialize with detected timezone immediately to avoid empty string
+  const [timezone, setTimezone] = useState<string>(() => {
+    try {
+      return getBrowserTimezone();
+    } catch (error) {
+      console.warn('Failed to detect timezone on initialization:', error);
+      return 'UTC';
+    }
+  });
+
+  useEffect(() => {
+    // Re-detect browser timezone on mount (in case it changed)
+    const detectedTimezone = getBrowserTimezone();
+    setTimezone(detectedTimezone);
+  }, []);
+
+  return (
+    <TimezoneContext.Provider value={{ timezone, setTimezone }}>
+      {children}
+    </TimezoneContext.Provider>
+  );
+}
+
+export function useTimezone() {
+  const context = useContext(TimezoneContext);
+  if (context === undefined) {
+    throw new Error('useTimezone must be used within a TimezoneProvider');
+  }
+  return context;
+}

client/lib/timezone.ts

@@ -0,0 +1,98 @@
+/**
+ * Timezone utilities for handling browser timezone detection and formatting
+ */
+
+export function getBrowserTimezone(): string {
+  try {
+    return Intl.DateTimeFormat().resolvedOptions().timeZone;
+  } catch (error) {
+    console.warn('Failed to detect browser timezone, falling back to UTC:', error);
+    return 'UTC';
+  }
+}
+
+export function formatTimestamp(
+  isoString: string, 
+  timezone?: string,
+  options?: Intl.DateTimeFormatOptions
+): string {
+  const date = new Date(isoString);
+  
+  if (!date || isNaN(date.getTime())) {
+    return 'Invalid date';
+  }
+
+  const defaultOptions: Intl.DateTimeFormatOptions = {
+    hour: '2-digit',
+    minute: '2-digit',
+    second: '2-digit',
+    hour12: false,
+    ...options
+  };
+
+  const targetTimezone = timezone || getBrowserTimezone();
+  
+  // If no valid timezone, fall back to local time
+  if (!targetTimezone || targetTimezone === '') {
+    console.warn('No valid timezone provided, using local time');
+    return date.toLocaleTimeString('en-US', defaultOptions);
+  }
+
+  try {
+    const result = new Intl.DateTimeFormat('en-US', {
+      ...defaultOptions,
+      timeZone: targetTimezone
+    }).format(date);
+    
+    return result;
+  } catch (error) {
+    console.warn('Failed to format timestamp with timezone, falling back to local:', error);
+    
+    // Try GMT+3 as a fallback if the detected timezone fails
+    try {
+      const gmt3Result = new Intl.DateTimeFormat('en-US', {
+        ...defaultOptions,
+        timeZone: 'Europe/Istanbul' // GMT+3
+      }).format(date);
+      return gmt3Result;
+    } catch (gmt3Error) {
+      console.warn('GMT+3 fallback also failed:', gmt3Error);
+      return date.toLocaleTimeString('en-US', defaultOptions);
+    }
+  }
+}
+
+export function formatTimestampWithDate(
+  isoString: string,
+  timezone?: string,
+  options?: Intl.DateTimeFormatOptions
+): string {
+  const date = new Date(isoString);
+  
+  if (!date || isNaN(date.getTime())) {
+    return 'Invalid date';
+  }
+
+  const defaultOptions: Intl.DateTimeFormatOptions = {
+    year: 'numeric',
+    month: '2-digit',
+    day: '2-digit',
+    hour: '2-digit',
+    minute: '2-digit',
+    second: '2-digit',
+    hour12: false,
+    ...options
+  };
+
+  const targetTimezone = timezone || getBrowserTimezone();
+
+  try {
+    return new Intl.DateTimeFormat('en-US', {
+      ...defaultOptions,
+      timeZone: targetTimezone
+    }).format(date);
+  } catch (error) {
+    console.warn('Failed to format timestamp with timezone, falling back to local:', error);
+    return date.toLocaleString('en-US', defaultOptions);
+  }
+}