Professional world clock with advanced time zone conversion, meeting planner, and global time tracking. Perfect for international teams, travelers, and businesses.
← Back to All ToolsSearch and add cities to track their local time. Use the quick actions to reset, clear, or export.
Open the Time Converter tab, choose source/target time zones, set a date & time, then convert.
Use the Meeting Planner to find overlapping business hours across your selected cities.
Find the best meeting times for your team with this planner. It takes into account business hours and availability.
Enter the date and select the time zones for your team members. The planner will show the best meeting times for all participants.
Time zones are regions sharing a standard time. The world is divided into 24 zones, roughly 15° of longitude each. UTC (Coordinated Universal Time) is the primary reference from which regional time zones are derived. Local rules such as daylight saving time (DST) can shift the effective offset from UTC throughout the year.
Europe/London) over raw GMT offsetsThis tool leverages the browser's built‑in Internationalization API (`Intl.DateTimeFormat`) to render accurate local times for each selected time zone. By passing a specific IANA time zone identifier (for example, `America/New_York` or `Asia/Tokyo`) to the formatter, the browser produces time and date strings that account for local conventions, daylight saving time (DST), regional calendars, and locale‑specific formatting rules. This standards‑based approach keeps the client‑side implementation lightweight while remaining highly accurate across platforms. For conversion, a base `Date` is created from the selected source time; then equivalent local times are displayed for target zones using the same `Intl` formatting pipeline.
The meeting planner evaluates hourly windows on a chosen date and classifies options based on overlaps with typical business hours in each selected city. A slot is rated "good" when the local times fall squarely within standard business hours for the majority of cities; "warning" represents partial overlap or extended hours; and "bad" indicates little overlap. This helps distributed teams quickly identify reasonable windows for calls without manual cross‑checking multiple calendars.
The app is written in modern, framework‑free JavaScript following an object‑oriented approach via the `ProfessionalWorldClock` class. The UI uses accessible HTML controls enhanced by Choices.js for searchable dropdowns. Rendering is efficient: the main update loop runs every second to refresh visible time strings while keeping DOM writes minimal. Business‑hour status indicators and UTC offset labels are recalculated alongside the time updates to maintain accuracy as local clocks tick and DST boundaries are crossed.
Export functionality demonstrates practical data handling. At any time, you can export the active clocks to JSON for structured storage, CSV for spreadsheets, or formatted text for quick sharing. The CSV export escapes values safely and includes headers; the JSON export includes a timestamp and a complete snapshot of cities, time zones, and offsets, which is useful for logging and team documentation.
Teams that operate globally—engineering, support, sales, and operations—often need to coordinate across many time zones daily. This tool reduces friction by providing an at‑a‑glance board of key cities and a reliable time converter. Project managers can select representative cities for all stakeholders and share exported snapshots with agendas. Customer‑facing teams benefit when scheduling demos across continents, while finance and trading desks can monitor market hours (open/close) indicators to time communications effectively.
Travelers and event organizers can also use the meeting planner to choose practical start times, avoiding costly reschedules due to DST surprises. Educators and community organizers that host international webinars can provide a clear, consistent time reference for participants regardless of location.
While the browser `Intl` API is robust, historical time rules occasionally change. For mission‑critical workflows, pair this local tool with authoritative sources (IANA database updates, official communications) and review your recurring schedules during regulatory changes or geopolitical shifts.
This tool provides general time and scheduling information for convenience only. Time data is generated locally in your browser using publicly available time zone rules and may not reflect last‑minute policy changes or exceptional circumstances. Always verify critical schedules—especially around daylight saving transitions—against official sources or organizational calendars. No warranties are provided and no liability is assumed for decisions made based on this information.