World Clock & Time Zone Converter
Compare times across the globe. Convert between zones, plan meetings, and track day/night status.
Time Zone Converter
Meeting Planner
24-Hour Timeline
Your Clocks
What is a World Clock & Time Zone Converter?
A world clock displays the current time across multiple time zones simultaneously, making it easy to coordinate with people in different parts of the world. A time zone converter helps you calculate what time it will be in a different location when you convert from your local time. Whether you're scheduling international calls, planning travel, or coordinating global teams, a world clock tool is essential for staying on top of time differences.
The Earth is divided into 24 primary time zones, each offset by one hour from the next. However, due to daylight saving time and local variations, the actual number of zones in use is much higher. This tool accounts for all current time zones and daylight saving time rules.
How to Use This World Clock
- View your local time: The prominently displayed local time at the top updates every second with your current time and UTC offset.
- Add cities: Search for any city or time zone in the search box and click "Add City" to start tracking it.
- Use presets: Click "US Zones," "EU Zones," "Asian Zones," or "Major Hubs" to quickly add multiple related time zones.
- Convert times: Use the Time Zone Converter section to input a time and date, then select the source and destination zones to see the equivalent time.
- Plan meetings: Select a meeting time and zone in the Meeting Planner to see what time it will be for all your added cities, with business hours status highlighted.
- View the timeline: Check the 24-hour timeline visualization to see day/night patterns across all added zones at a glance.
- Toggle format: Switch between 12-hour and 24-hour time format using the toggle at the top.
- Remove clocks: Click the X button on any clock card to remove it from your display.
- Reorder clocks: Drag and drop clocks to organize them in your preferred order (order is saved locally).
Time Zone Conversion Basics
- UTC (Coordinated Universal Time): The global standard time from which all other zones are offset. Also called GMT (Greenwich Mean Time).
- Time Zone Offset: Shown as UTC±HH:MM. For example, UTC-5 means 5 hours behind UTC; UTC+9 means 9 hours ahead.
- Daylight Saving Time (DST): Many regions shift their clocks forward one hour in spring and back one hour in fall. This tool accounts for DST automatically.
- Business Hours: Typically 9:00 AM to 5:00 PM. The Meeting Planner highlights which zones are in business hours (green), off-hours (yellow), or sleeping (dark blue).
- International Date Line: The 180° longitude line where the calendar date changes. Crossing it changes the date by one day.
- Half-hour and 45-minute offsets: Some regions (like India and Nepal) use 30-minute or 45-minute offsets rather than full hours.
Common Use Cases
- Remote teams: Instantly see what time teammates are working in their local zones.
- International calls: Find overlapping business hours for scheduling meetings across continents.
- Travel planning: Know your local time when you arrive in a new zone and plan your activities accordingly.
- Trading and finance: Stay on top of market opening and closing times across different stock exchanges.
- Online gaming: Coordinate raid times and events across global player bases.
- Customer support: Track when your international support team is online and available.
Frequently Asked Questions
Why does the time difference change during daylight saving time?
Daylight saving time (DST) causes time differences to shift by one hour when regions transition into or out of DST on different dates. Since not all countries observe DST or do so on the same dates, time differences can change temporarily. This tool automatically accounts for DST based on your browser's system settings and time zone data.
What's the difference between GMT and UTC?
GMT (Greenwich Mean Time) and UTC (Coordinated Universal Time) are essentially the same for practical purposes. UTC is the modern international standard, while GMT is an older standard. Both represent the same reference time zone. This tool uses UTC as the reference.
How many time zones are there?
The Earth is divided into 24 theoretical time zones based on 15-degree longitude intervals. However, political and geographical boundaries mean there are actually 38 standard time zones in use, plus additional zones during daylight saving transitions. This tool supports all standard and DST-adjusted zones.
Why do some places have 30-minute or 45-minute offsets?
Some countries chose to offset their time by 30 minutes or 45 minutes from UTC for historical, geographical, or political reasons. Examples include India (UTC+5:30) and Nepal (UTC+5:45). These are fully supported by this tool.
Can I export or share my clock configuration?
Your clocks and preferences are saved automatically to your browser's local storage and persist when you return to the page. However, this data is stored locally on your device and cannot be exported or shared. If you want to recreate the setup on another device, you'll need to manually add the cities again.
How accurate is this tool?
This tool uses your browser's built-in time zone and date/time data, which is kept up-to-date by your operating system. It relies on the IANA Time Zone Database for accurate current time and DST rules. The times shown are as accurate as your device's system clock.
Is my data private?
Yes! All time calculations happen in your browser. Your clock preferences are stored only in your browser's local storage and never sent to any server. This tool doesn't track you, use cookies, or collect personal data beyond what you choose to interact with.
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