Timezone Meeting Planner

Find overlapping business hours across cities worldwide.

Business Hours (9AM-6PM) ✅ All Overlap Current Hour

How This Tool Works

Operation: The Time Zone Planner helps users schedule events across multiple time zones simultaneously. The tool converts times between UTC and various global time zones using JavaScript's Intl.DateTimeFormat API with the timeZone option:

  • Time Conversion: For a given source time, the tool computes the equivalent time in each target time zone: new Intl.DateTimeFormat('en-US', { timeZone: 'America/New_York', ..., hour12: false }).
  • Timezone Database: The tool includes IANA time zone identifiers (e.g., 'Asia/Kolkata', 'America/New_York', 'Europe/London') and displays the current UTC offset and DST status for each.
  • Overlay Grid: The main interface is a 24-hour horizontal grid showing working hours (9 AM–5 PM local) shaded for each time zone. A vertical cursor shows the current time across all zones.
  • Meeting Suggestion: The tool identifies overlapping business hours across selected time zones, highlighting windows where all participants are simultaneously available.

All time zone data uses the browser's built-in ICU database (via Intl API) — no external time zone data downloads needed.

Key Benefits of Using the Time Zone Planner

  • Complete scheduling privacy: Your meeting times, participant time zones, and scheduling preferences are processed entirely in your browser. No calendar data is sent to any server — critical when coordinating confidential meetings or planning events with undisclosed participant lists.
  • Visual daylight overlay: The 24-hour grid with shaded business hours makes it immediately obvious which times work for all participants. No mental subtraction of UTC offsets or wondering whether '9 AM their time' is reasonable in their local context.
  • Automatic DST handling: The IANA time zone database (via the Intl API) accurately accounts for all current Daylight Saving Time rules worldwide. When a region enters or exits DST, the displayed offset updates automatically — no manual adjustment needed.

Practical Real-World Use Cases

  • Remote teams coordinating across continents: A project manager with team members in India (IST), the US East Coast (EST/EDT), and the UK (GMT/BST) can identify overlapping business hours — typically 6–9 PM IST, 8–10 AM EST, and 1–3 PM GMT — for standup meetings.
  • Freelancers scheduling client calls: A freelance web developer based in India working with clients in Australia (AEST), Dubai (GST), and Canada (PST) can find a single time slot that works for all three without sending a 'when are you free?' email chain.
  • Event organisers planning webinars: An organiser scheduling a live webinar for a global audience can check the business-hour overlap across Americas, EMEA, and APAC regions to choose a time that maximises live attendance in each major market.

Frequently Asked Questions (FAQ)

How many time zones can I compare at once?

There is no fixed limit, but the interface displays up to 10 time zones clearly. Beyond 10, the display becomes visually cluttered. For large teams, identify the 5–8 most critical time zones and add those.

Does this handle half-hour time zones (e.g., IST, Nepal)?

Yes — the IANA time zone database includes all current UTC offsets, including India (UTC+5:30), Nepal (UTC+5:45), Newfoundland (UTC-3:30), and others. The tool displays and converts all standard offsets accurately.

Can I share a proposed meeting time with others?

Not directly — the tool is for your personal planning. To share a proposed time, use the 'Copy' function to export the meeting time in UTC and each participant's local time, then paste into your email or calendar invitation.