Time Zone Calculator

Scheduling a call with someone in Tokyo while you're in New York? This time zone calculator converts any time in any time zone to any other time zone around the world — instantly.

How to Use This Calculator

1. Enter the time you want to convert (hour and minute).
2. Select the source time zone.
3. Select the target time zone.
4. Click Calculate to see the converted time and the UTC offset for each zone.

Major Time Zone Reference (UTC Offsets)

• UTC−5 (EST): New York, Miami, Toronto (UTC−4 EDT in summer)
• UTC−6 (CST): Chicago, Mexico City (UTC−5 CDT in summer)
• UTC−8 (PST): Los Angeles, Seattle, Vancouver (UTC−7 PDT in summer)
• UTC+0 (GMT/UTC): London (UTC+1 BST in summer)
• UTC+1 (CET): Paris, Berlin, Rome (UTC+2 CEST in summer)
• UTC+5:30 (IST): India — no DST
• UTC+8 (CST): Beijing, Singapore, Hong Kong
• UTC+9 (JST): Tokyo, Seoul
• UTC+10 (AEST): Sydney (UTC+11 AEDT in summer)

Common Mistakes to Avoid

• Ignoring daylight saving time — DST causes UTC offsets to shift by 1 hour. Not all countries observe DST (e.g., India, China, Japan don't). Arizona (USA) also doesn't.
• Crossing the international date line — Converting time from +12 to −11 may cross midnight and change the date. Always check the day, not just the hour.
• Using abbreviations without checking — "CST" means both Central Standard Time (UTC−6) and China Standard Time (UTC+8). Always verify the full time zone name.

Frequently Asked Questions

What is UTC?

Coordinated Universal Time — the global time standard. All other time zones are expressed as offsets from UTC (e.g., EST = UTC−5). UTC never changes for daylight saving, making it ideal for scheduling across zones.

What is the best time for a global meeting?

For a US (EST) + UK + India meeting: 8–9 AM EST = 1–2 PM GMT = 6:30–7:30 PM IST — a window that's business hours for all three. Use this calculator to find the intersection of business hours across your participants' zones.

Conclusion

Time zone conversion is essential for global work, travel, and communication. Use this calculator to schedule any cross-timezone meeting or call without the mental math of UTC offsets.

Related: Time Calculator | Date Calculator | Hours Calculator