💡 Expert Insight: Time zone calculations are complex due to Daylight Saving Time (DST) rules that vary by country and year. This tool uses the industry-standard 'moment-timezone' library to ensure accuracy, automatically accounting for DST transitions and historical time zone changes.
Track Time Across the Globe
Working with a remote team? Trying to call family overseas? Or just curious what time it is in Tokyo?
Our World Clock lets you add as many cities as you want and see their exact time in one place. No more mental math or Googling "time in London" every five minutes.
Why Use a World Clock?
Remote Team Coordination
See at-a-glance what time it is for all team members globally. Schedule meetings at times that work for everyone, avoiding midnight calls or early morning disruptions.
International Business
Contact clients and vendors during their business hours. Know when markets open/close in different regions. Coordinate product launches across global time zones.
Travel Planning
Check arrival times, coordinate pickups, and adjust to destination time zones before you travel. Reduce jet lag by planning sleep schedules around new time zone.
Staying Connected
Call family and friends at convenient times. Avoid waking loved ones by checking their current time before calling/messaging.
How to Use the World Clock
Add Time Zones
- Select city/time zone from dropdown menu
- Click "Add" button
- New clock appears showing current time in that location
- Add unlimited zones - monitor as many locations as needed
View Live Times
All clocks update in real-time, showing:
- Current time in 24-hour format (HH:MM:SS)
- Full date (day, month, date, year)
- City/region name and time zone identifier
Remove Clocks
Click the × button next to any clock to remove it from your dashboard. Customized clock list saves automatically for next visit.
Automatic Detection
Tool automatically adds your local time zone and UTC on first load. Personalize by adding other relevant locations.
Common Time Zone Uses
Remote Work Teams
Scenario: Team members in San Francisco, New York, London, and Singapore.
Solution: Add all 4 time zones. When it's 9 AM in SF, instantly see it's 12 PM NYC, 5 PM London, 1 AM Singapore (next day). Schedule meetings during overlapping work hours.
Global Stock Trading
Tracked Zones: Tokyo (9:00-15:00 JST), London (8:00-16:30 GMT), New York (9:30-16:00 EST).
Benefit: Know exact market opening/closing times, plan trades, monitor 24-hour forex markets.
Customer Support
Use Case: 24/7 support team across 3 shifts globally.
Setup: Monitor time zones for all support centers. Coordinate handoffs between regions as shifts change.
Event Broadcasting
Scenario: Webinar, product launch, or live stream.
Application: Check what time event airs in all target markets. Advertise local times to maximize attendance.
📝 Example: International Meeting
Finding mutual time for team in 4 zones:
- Los Angeles: 8 AM - 5 PM
- New York: 11 AM - 8 PM
- London: 4 PM - 1 AM
- Mumbai: 9:30 PM - 6:30 AM
Overlap Window: 8-9 AM LA (11 AM-12 PM NY, 4-5 PM London, 9:30-10:30 PM Mumbai)
Best Time: 8:30 AM LA = within working hours for LA/NY/London, evening for Mumbai
Understanding Time Zones
UTC (Coordinated Universal Time)
Global time standard, zero offset. All other zones are UTC +/- hours. Example: EST = UTC-5, IST = UTC+5:30.
GMT vs UTC
Practically identical for everyday use. GMT is solar time, UTC is atomic time. Most contexts treat them as equivalent.
Daylight Saving Time (DST)
Many regions shift clocks forward 1 hour in spring, backward in fall. Tool automatically accounts for DST. During DST, EST becomes EDT (Eastern Daylight Time), PST becomes PDT, etc.
Fractional Time Zones
Not all zones are full hours from UTC:
- India: UTC+5:30
- Nepal: UTC+5:45
- Australia (Central): UTC+9:30
- Newfoundland: UTC-3:30
Best Practices for Global Coordination
Always Specify Time Zone
Don't say "3 PM" - say "3 PM EST" or "15:00 UTC". Ambiguity causes missed meetings and confusion.
Use UTC for Technical Systems
Log timestamps, server schedules, and databases in UTC. Convert to local time zones only for user display.
Account for Date Changes
A Monday 11 PM call in New York is Tuesday 9 AM in Singapore. Always check the date, not just time.
Create Meeting Windows
For recurring meetings, establish fixed times that rotate fairness. Example: alternate between Asia-friendly and Americas-friendly times weekly.
Scheduling Tools & Strategies
Time Zone Converters
Use world clock to find current times, then calculate meeting slots. Example: If it's 2 PM UTC now, 2 PM UTC tomorrow is 9 AM EST, 10 PM JST.
Calendar Integration
Modern calendars (Google Calendar, Outlook) show events in recipient's local time. Still useful to reference world clock during scheduling discussions.
Recording for Asynchronous Viewing
For all-hands meetings spanning 12+ hour time zones, record synchronous session for async viewing by unreachable zones.
Travel & Jet Lag Management
Pre-Travel Adjustment
Days before travel, gradually shift sleep schedule toward destination time. World clock shows target time zone to plan adjustments.
Arrival Time Planning
Book flights arriving in evening at destination (even if it's morning departure local time). Easier to sleep on local nighttime than force midday sleep.
Meeting Coordination
When traveling, check both home and destination times. Avoid scheduling home-office calls at 3 AM destination time.
Common Time Zone Challenges
Daylight Saving Transitions
Problem: US/Europe change DST on different dates, creating temporary time differences.
Solution: Confirm meetings week of DST changes. This tool auto-updates, but older calendars may not.
International Date Line
Confusion: Flying from LA to Tokyo "loses a day" crossing date line westward.
Clarification: Depart LA Monday 11 PM, arrive Tokyo Tuesday 3 AM+1 day (15-hour flight + time zone shift).
Global Business Operations
Multi-Timezone Team Management
Managing teams across continents requires constant time zone awareness. World clocks eliminate mental math and prevent scheduling errors.
Team coordination strategies:
- Overlap windows: Identify hours when all zones have working hours overlap
- Rotating fairness: Alternate meeting times to share inconvenience equally
- Asynchronous first: Default to async communication, synchronous only when necessary
- Time zone buddies: Pair team members in similar zones for real-time collaboration
International Sales Coordination
Sales teams targeting global markets must contact prospects during their business hours.
Sales timing best practices:
- Call prospects 9 AM-5 PM their local time
- Send emails to arrive early morning in recipient's timezone
- Schedule demos during prospect's peak productivity hours
- Avoid Fridays/Mondays for international cold calls
- Research local holidays before scheduling
24/7 Operations Planning
Companies running round-the-clock operations coordinate handoffs between regional teams.
Follow-the-sun model:
- Asia-Pacific shift (8 AM-5 PM AEST): Handles tickets, passes to EMEA
- EMEA shift (8 AM-5 PM GMT): Continues work, passes to Americas
- Americas shift (8 AM-5 PM EST): Completes cycle, passes back to APAC
- Result: 24-hour coverage with normal working hours for all
Executive Calendar Management
C-suite executives traveling globally need constant timezone awareness for calls and meetings.
Executive assistant workflow:
- Track executive's current timezone
- Monitor home office timezone
- Display key stakeholder timezones
- Schedule calls accounting for all three perspectives
- Send calendar invites with multiple timezone references
Travel Industry Applications
Flight Scheduling and Coordination
Airlines, travel agents, and passengers use world clocks to understand arrival/departure times.
Flight timing scenarios:
- Departure: Depart LAX 11 PM PST
- Flight duration: 14 hours
- Arrival: Land Tokyo 6 AM JST (+1 day)
- Confusion point: "Next day" arrival due to date line crossing
- World clock solution: See both cities' times simultaneously
Hotel Check-In Coordination
Travelers coordinate hotel check-ins across timezones to avoid early arrival fees or missed reservations.
Check-in planning:
- Flight lands 6 AM local time
- Hotel check-in: 3 PM local time
- Gap: 9 hours to fill
- Solution: Book day-use hotel or plan sightseeing
- World clock helps visualize this gap during planning
Tour Operator Timing
Tour companies coordinate pickups, activities, and drop-offs across multiple timezones for international clients.
Tour coordination example:
- Cruise ship docks: 8 AM local time
- Shore excursion: 9 AM-4 PM
- Ship departs: 5 PM sharp
- Operator must track local time + ship time (often different)
- Late return = passengers miss ship departure
International Flight Crew Scheduling
Airlines schedule crew across timezones while complying with rest requirements.
Crew rest regulations:
- Minimum rest hours between flights
- Calculated in crew's home timezone
- Must account for timezone changes
- World clock essential for compliance verification
Content Creator Scheduling
Global Audience Targeting
YouTubers, streamers, and social media creators optimize posting times for global reach.
Optimal posting strategy:
- YouTube: Post when US, Europe, and Asia have overlap (rare, requires compromise)
- Instagram: Post 9-11 AM in target audience's primary timezone
- Twitter: Post during commute hours (7-9 AM, 5-7 PM) in key markets
- LinkedIn: Tuesday-Thursday, 8-10 AM in professional's timezone
Live Stream Coordination
Streamers balance streaming during peak hours for different global audiences.
Stream timing analysis:
- Stream at 8 PM EST: Great for US East Coast, midnight in UK, 9 AM next day in Sydney
- Stream at 2 PM EST: Morning in US, evening in Europe, night in Asia
- Solution: Rotate stream times weekly to serve all audiences fairly
Podcast Release Timing
Podcasters schedule releases to hit morning commutes in target markets.
Release strategy:
- Identify primary audience geography
- Schedule release for 6 AM in that timezone
- Appears in podcast apps during morning routine
- Maximizes day-of downloads and engagement
Virtual Event Planning
Webinars, online conferences, and virtual summits require timezone-friendly scheduling.
Multi-timezone event strategies:
- Single session: Choose time with maximum overlap (e.g., 10 AM EST = 3 PM GMT = 11 PM SGT)
- Multiple sessions: Repeat event 2-3 times across 24 hours
- Recorded + live Q&A: Record presentation, host live Q&A in multiple timezones
- Always-on access: Record everything, allow async viewing
Historical Time Zone Changes
Notable Timezone Shifts
Countries occasionally change timezones for political, economic, or practical reasons.
Recent major changes:
- Samoa (2011): Jumped from UTC-11 to UTC+13, skipping December 30 entirely
- Russia (2014): Eliminated most DST, reduced from 11 to 9 timezones
- North Korea (2015): Created unique UTC+8:30 timezone, later reverted to UTC+9
- Turkey (2016): Permanently adopted DST, staying UTC+3 year-round
- Brazil (2019): Abolished DST after decades of use
Daylight Saving Time History
DST adoption varies globally, creating temporary timezone complexity.
DST facts:
- US/Canada: Second Sunday March - First Sunday November
- Europe: Last Sunday March - Last Sunday October
- Southern Hemisphere: Opposite schedule (October-March)
- Equatorial regions: Generally no DST (minimal daylight variation)
- Trend: Many countries abandoning DST (EU considering elimination)
Future Changes to Watch
Proposed and potential timezone changes that may affect global coordination.
Upcoming considerations:
- EU DST elimination: Proposed but not yet implemented, would affect 27 countries
- US permanent DST: Sunshine Protection Act proposed, not yet passed
- China single timezone: Debate about splitting into multiple zones (currently all UTC+8)
- International Date Line adjustments: Pacific nations may shift for trade alignment
Impact on Global Business
Timezone changes create short-term chaos for international operations.
Business impact examples:
- Meeting times suddenly shift by 1 hour
- Automated systems require updates
- Contracts with time-specific clauses need clarification
- Trading hours between markets change
- Customer support coverage gaps appear
Advanced World Clock Features
Time Zone Abbreviation Pitfalls
Avoid ambiguous abbreviations that mean different things in different regions.
Confusing abbreviations:
- CST: Central Standard (US), China Standard, Cuba Standard Time
- IST: India Standard, Israel Standard, Irish Standard Time
- EST: Eastern Standard (US/Canada) or Eastern Standard (Australia)
- Solution: Always use city names or UTC offsets instead
Calculating Time Differences
Quick mental math for common timezone conversions.
Common conversions:
- EST to GMT: +5 hours (EST noon = GMT 5 PM)
- PST to JST: +17 hours (PST 8 AM = JST 1 AM next day)
- GMT to IST: +5:30 hours (GMT noon = IST 5:30 PM)
- EST to AEST: +15 hours (EST 6 PM = AEST 9 AM next day)
Conclusion
Whether managing global teams, coordinating international travel, scheduling content for worldwide audiences, or simply staying connected with friends and family across continents, our world clock provides instant visibility into current times across any number of locations. Add unlimited cities, track DST changes automatically, and eliminate timezone confusion. Perfect for remote teams, international businesses, travelers, content creators, and anyone working across borders. Start tracking time zones that matter to you!




