World Clock & Timezone Converter
Live multi-city clocks across international timezones, meeting scheduler slider, business hours overlap calculator, and daylight saving shifts (DST).
Slide back and forth to see the time in every pinned capital simultaneously to schedule cross-timezone calls:
Recommended cross-continental business hours when distributed teams are simultaneously awake:
Pinned International Clocks8 Active
Live Synchronized: 2:58:13 PM
UTC / GMT
Prime Meridian
New York
NYSE / Wall St
London
LSE / Tech
Dhaka
South Asia Hub
Dubai
Gulf Financial
Tokyo
TSE / APAC Hub
Sydney
ASX / Pacific
San Francisco
Silicon Valley
Major Global Financial & Tech Timezones (UTC Offsets)
Standard IANA timezones and UTC offsets for leading stock exchanges, tech hubs, and international business capitals:
Curated Timezone Corridors
Instant 1-click clock configurations for distributed teams, cross-border trading, and global standups:
Global Remote Tech Hubs
Silicon Valley, East Coast, Europe, South Asia & APAC
US Cross-Coast Hubs
PST, MST, CST & EST Coast-to-Coast Coverage
European Financial Centers
London, Frankfurt, Zurich, Paris & Amsterdam
Asia-Pacific (APAC) Markets
Gulf, India, Singapore, Tokyo & Australia
Major Global Stock Exchanges
NYSE, LSE, Euronext, TSE & Tadawul Hours
Middle East & North Africa (MENA)
Dubai, Abu Dhabi, Riyadh, Cairo & Financial Hubs
How Timezones, UTC, and Daylight Saving Time (DST) Work
Coordinated Universal Time (UTC) & GMT
UTC is the primary atomic time standard by which the world regulates clocks. Unlike Greenwich Mean Time (GMT), which is a timezone based on Earth's rotation, UTC is kept accurate by high-precision atomic clocks and leap seconds.
The 24 Longitudinal Meridians (15° Per Hour)
Because Earth rotates 360° every 24 hours, each 15° of longitude corresponds to exactly 1 hour of solar time difference. Standard international timezones are based on offsets from the Prime Meridian (0° longitude at Greenwich, London).
Daylight Saving Time (DST) Shifts
During summer months, many countries advance clocks by 1 hour (e.g. EST becomes EDT in New York, and GMT becomes BST in London). Because hemispheres observe DST in opposite seasons, relative hour gaps between cities shift dynamically throughout the year.
Frequently Asked Questions — World Clock & Timezones
What is the difference between UTC and GMT?
GMT is an official timezone used in the UK and parts of Africa during winter months. UTC is not a timezone, but the global atomic time standard used by servers, GPS, aviation, and financial markets to calculate all international time offsets.
How does the Meeting Planner Slider help remote teams?
By dragging the time slider, you can test different candidate meeting times (e.g., 9:00 AM New York) and immediately see the corresponding local time for team members in London, Dhaka, Tokyo, or Sydney. Green badges indicate normal business hours (9:00 AM – 6:00 PM).
Does this tool automatically account for Daylight Saving Time (DST)?
Yes. All time calculations use the browser's native IANA Time Zone Database (Intl.DateTimeFormat), which automatically applies historical and active Daylight Saving Time rules for every specific jurisdiction.
Can I copy the meeting schedule into Slack or email?
Yes. Simply click the "Copy All Clocks for Meeting Invite" button in the left studio to instantly copy a formatted agenda with city names, flags, times, and working hour statuses directly to your clipboard.