Time Zone Converter
Convert times between 25+ world time zones instantly. Handles daylight saving time automatically.
Enter a date/time, pick source and target time zones, then click Convert to see the converted time.
How Time Zones Actually Work
The world is divided into 24 primary time zones, each roughly 15 degrees of longitude wide. UTC (Coordinated Universal Time) is the reference — every zone is defined as an offset from UTC. New York is UTC-5 in winter, UTC-4 in summer. London is UTC+0 in winter, UTC+1 in summer. Tokyo is UTC+9 all year (Japan doesn't observe DST).
This converter uses your browser's Intl API and the IANA timezone database — the same source your phone and computer rely on. It handles daylight saving transitions automatically, so you don't have to remember which regions are currently shifted.
Major City Time Offsets
Standard offsets for the cities people convert most. Remember: DST shifts these by +1 hour where observed.
| City | Zone Name | UTC Offset (Standard) | UTC Offset (DST) |
|---|---|---|---|
| Los Angeles | Pacific (PST/PDT) | UTC-8 | UTC-7 |
| Denver | Mountain (MST/MDT) | UTC-7 | UTC-6 |
| Chicago | Central (CST/CDT) | UTC-6 | UTC-5 |
| New York | Eastern (EST/EDT) | UTC-5 | UTC-4 |
| London | GMT/BST | UTC+0 | UTC+1 |
| Paris / Berlin | CET/CEST | UTC+1 | UTC+2 |
| Dubai | Gulf (GST) | UTC+4 | No DST |
| Mumbai | IST | UTC+5:30 | No DST |
| Singapore | SGT | UTC+8 | No DST |
| Tokyo | JST | UTC+9 | No DST |
| Sydney | AEST/AEDT | UTC+10 | UTC+11 |
| Auckland | NZST/NZDT | UTC+12 | UTC+13 |
The Daylight Saving Trap
DST causes more scheduling disasters than any other time issue. The problem isn't that clocks shift — it's that they shift on different dates in different countries. Here's what catches people out:
US and Europe switch on different weeks
The US springs forward in early March, Europe in late March. For 2-3 weeks, the time difference between London and New York is 4 hours instead of the usual 5. The same thing happens in reverse in November. Your recurring meeting shifts by an hour and nobody notices until someone misses it.
Southern Hemisphere flips the other way
Australia and New Zealand spring forward when the Northern Hemisphere falls back. In January, Sydney is 16 hours ahead of New York. In July, it's only 14. The gap changes twice a year and not on the same dates.
Some places don't observe DST at all
Arizona (except the Navajo Nation), Hawaii, Japan, China, India, Singapore, and most of Africa and South America stay on standard time year-round. When everyone else shifts, the gap with these places changes by an hour.
Half-hour and 45-minute offsets exist
India is UTC+5:30. Nepal is UTC+5:45. Iran is UTC+3:30. Parts of Australia use UTC+9:30. You can't just count whole hours to figure out the time — always use a converter for these zones.
Meeting Overlap Windows
Finding a time that works across continents is the hardest part of remote work. Here are the realistic overlap windows for common combinations:
UK ↔ US East Coast
5 hours apart. Best overlap: 2-5pm London = 9am-12pm New York. Both in normal business hours.
UK ↔ US West Coast
8 hours apart. Tough overlap: 4-6pm London = 8-10am Los Angeles. Only 2-3 usable hours per day.
US East ↔ India
10.5 hours apart. Best overlap: 8-10am New York = 6:30-8:30pm Mumbai. Early morning US, late evening India.
UK ↔ Australia
10-11 hours apart. Best overlap: 7-9am London = 5-7pm Sydney. First thing UK morning, end of Australian workday.
US East ↔ Japan
14 hours apart. Almost no overlap. 8am New York = 10pm Tokyo. Most teams use async communication.
Europe ↔ US West Coast
9 hours apart. Narrow window: 5-6pm Berlin = 8-9am San Francisco. One-hour window at best.
Tips for Working Across Time Zones
- Always specify the time zone when scheduling. "Let's meet at 3pm" means nothing without a zone. Use "3pm GMT" or "3pm ET" to avoid confusion. Better yet, include two zones: "3pm London / 10am New York."
- Pin a world clock to your desktop. Add the cities you work with most. Knowing the current time in your colleague's location prevents the "I didn't realise it was 11pm for you" moment.
- Watch out for DST transition weeks. Set calendar reminders for the weeks when your country and your collaborator's country switch clocks. These are the highest-risk periods for missed meetings.
- Use UTC for shared deadlines. If your team spans 3+ time zones, set deadlines in UTC. Everyone converts once, and there's no ambiguity about which "end of day" applies.
Related Tools
How to use this tool
Enter the date and time you want to convert
Select the source and destination time zones
Click Convert to see the adjusted date and time
Common uses
- Scheduling meetings across international teams
- Converting flight departure times to local time
- Coordinating live events for a global audience
- Tracking cryptocurrency market hours worldwide
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