Time Zone Calculator
Convert times between different time zones.
Updates on refresh or re-render.
Time Zone Calculator
Everything you need to know
About the Time Zone Calculator
In our globally connected world, scheduling a meeting with colleagues in London, New York, and Tokyo can feel like solving a puzzle. Our time zone calculator eliminates the confusion by converting any time across all major time zones, accounting for daylight saving time (DST) changes automatically.
What you can do:
- Convert any time to any time zone
- Find meeting windows that work for multiple locations
- Check DST status to avoid scheduling mistakes
- Compare business hours across global offices
Major Time Zones
| Time Zone | UTC Offset | Major Cities |
|---|---|---|
| UTC/GMT | +0:00 | London, Lisbon, Accra |
| EST (Eastern) | -5:00 / -4:00 (DST) | New York, Toronto, Miami |
| CST (Central) | -6:00 / -5:00 (DST) | Chicago, Dallas, Mexico City |
| MST (Mountain) | -7:00 / -6:00 (DST) | Denver, Phoenix, Calgary |
| PST (Pacific) | -8:00 / -7:00 (DST) | Los Angeles, Seattle, Vancouver |
| AKST (Alaska) | -9:00 / -8:00 (DST) | Anchorage |
| HST (Hawaii) | -10:00 | Honolulu |
| BRT (Brasília) | -3:00 | São Paulo, Rio de Janeiro |
| CET (Central Europe) | +1:00 / +2:00 (DST) | Paris, Berlin, Rome, Madrid |
| EET (Eastern Europe) | +2:00 / +3:00 (DST) | Athens, Cairo, Jerusalem |
| IST (India) | +5:30 | Mumbai, New Delhi, Bangalore |
| CST (China) | +8:00 | Beijing, Shanghai, Hong Kong |
| JST (Japan) | +9:00 | Tokyo, Osaka |
| AEST (Australia East) | +10:00 / +11:00 (DST) | Sydney, Melbourne |
Example Conversions
Meeting Scheduling
Scenario: You want to schedule a call at 2:00 PM your time (New York, EST).
| Your Time | London | Paris | Dubai | Mumbai | Singapore | Tokyo | Sydney |
|---|---|---|---|---|---|---|---|
| 2:00 PM EST | 7:00 PM | 8:00 PM | 11:00 PM | 12:30 AM+1 | 3:00 AM+1 | 4:00 AM+1 | 6:00 AM+1 |
+1 = next day
Best meeting window: 9:00 AM - 11:00 AM EST = late afternoon in Europe, evening in Asia.
Global Team Hours
| City | Business Hours | Overlap with NYC (9-5) |
|---|---|---|
| London | 9 AM - 5 PM GMT | 9 AM - 12 PM EST |
| Berlin | 9 AM - 5 PM CET | 9 AM - 12 PM EST |
| Dubai | 9 AM - 5 PM GST | None (8 hours ahead) |
| Mumbai | 9 AM - 5 PM IST | None (9.5 hours ahead) |
| Singapore | 9 AM - 5 PM SGT | None (12 hours ahead) |
| Tokyo | 9 AM - 5 PM JST | None (13 hours ahead) |
| Sydney | 9 AM - 5 PM AEDT | None (14-16 hours ahead) |
| Los Angeles | 9 AM - 5 PM PST | 12 PM - 5 PM EST |
For US-East + Europe teams: Schedule 9:00 AM - 12:00 PM EST. For US-West + Asia teams: Schedule 6:00 PM - 9:00 PM PST.
Daylight Saving Time (DST)
DST changes create temporary confusion:
| Region | DST Start | DST End | DST Shift |
|---|---|---|---|
| US/Canada | 2nd Sunday, March | 1st Sunday, November | +1 hour |
| EU/UK | Last Sunday, March | Last Sunday, October | +1 hour |
| Australia | 1st Sunday, October | 1st Sunday, April | +1 hour |
The "DST Gap": For one week in March and one week in October, the US and Europe are offset by different amounts because they change on different dates.
Example: Mid-March, before Europe changes:
- New York: EDT (UTC-4)
- London: GMT (UTC+0)
- Difference: 4 hours
After Europe changes:
- New York: EDT (UTC-4)
- London: BST (UTC+1)
- Difference: 5 hours
Time Zone Tips for Remote Work
- Use UTC for coordination: "Let's meet at 14:00 UTC" eliminates ambiguity
- Send calendar invites: Google Calendar and Outlook handle time zones automatically
- Check DST status: Verify whether each location is currently in DST
- Rotate meeting times: Don't always make the same person join at odd hours
- Record meetings: For participants who can't attend live
- Use async communication: Email, Slack, and project tools reduce meeting needs
- Be specific: Say "9:00 AM EST" not just "9:00 AM"
UTC and Military Time
| Civilian Time | 24-Hour | UTC Offset | Common Name |
|---|---|---|---|
| 12:00 AM | 00:00 | Z | Zulu time |
| 6:00 AM | 06:00 | +6 | India time |
| 12:00 PM | 12:00 | +0 | Noon GMT |
| 6:00 PM | 18:00 | -6 | Central Standard |
Military and aviation use the NATO phonetic alphabet for time zones (Zulu = UTC, Alpha = UTC+1, Bravo = UTC+2, etc.).
Frequently Asked Questions
How many time zones are there?
Theoretically 24 (one per hour), but political boundaries create about 38-40 in practice. Some are offset by 30 or 45 minutes (India, Nepal, Australia).
What happens when you cross the International Date Line?
You gain or lose a day. Crossing westward (Asia to America) adds a day. Crossing eastward (America to Asia) subtracts a day.
Why doesn't Arizona observe DST?
Arizona (except the Navajo Nation) stays on Mountain Standard Time year-round due to extreme summer heat—more evening sunlight isn't desirable.
What's the biggest time difference between two places?
26 hours. If it's 12:00 PM Monday in Kiribati (UTC+14), it's 10:00 AM Sunday in Baker Island (UTC-12).
How do I handle scheduling during DST transition?
Schedule meetings at least one week away from DST changes. If a meeting is scheduled during the "fall back" hour, clarify whether you mean the first or second 1:00 AM.