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ToolPrime

Time Zone Converter

Convert time between 100+ cities across all time zones. See live clocks, UTC offsets, and a full hour-by-hour comparison table. Uses the Intl API — no external dependencies.

07:02:03 PM

Thursday, April 2, 2026

GMT-4

12:02:03 AM

Friday, April 3, 2026

GMT+1

Hour-by-hour time comparison
New YorkLondon
06:00 PM11:00 PM
07:00 PM12:00 AM
08:00 PM01:00 AM
09:00 PM02:00 AM
10:00 PM03:00 AM
11:00 PM04:00 AM
12:00 AM05:00 AM
01:00 AM06:00 AM
02:00 AM07:00 AM
03:00 AM08:00 AM
04:00 AM09:00 AM
05:00 AM10:00 AM
06:00 AM11:00 AM
07:00 AM12:00 PM
08:00 AM01:00 PM
09:00 AM02:00 PM
10:00 AM03:00 PM
11:00 AM04:00 PM
12:00 PM05:00 PM
01:00 PM06:00 PM
02:00 PM07:00 PM
03:00 PM08:00 PM
04:00 PM09:00 PM
05:00 PM10:00 PM

How to Use the Time Zone Converter

  1. Select the city or timezone you want to convert from
  2. Select the destination city or timezone
  3. View the live clock comparison and hour-by-hour table
  4. Use the swap button to reverse the conversion

What Is a Time Zone Converter?

A time zone converter translates a specific date and time from one time zone to another, accounting for UTC offsets and daylight saving time (DST) transitions. Modern converters leverage the browser's built-in Intl API to access the IANA time zone database, ensuring accurate results even when DST rules change between countries.

Time zones are far more complex than simple hour offsets. India uses UTC+5:30, Nepal uses UTC+5:45, and some regions like Arizona ignore DST entirely while neighboring states observe it. A reliable converter handles all these edge cases, letting you schedule across borders without mental arithmetic or costly mistakes.

Popular Use Cases

Remote Team Coordination

Find overlapping work hours between distributed team members across multiple time zones to schedule standups and meetings.

Travel Planning

Convert departure and arrival times to local time at your destination so you can plan ground transport and hotel check-ins.

International Business

Determine market opening hours, conference call windows, and contract deadlines across global offices and partners.

Event Scheduling

Share webinar or live-stream start times in each attendee's local time zone to maximize turnout and reduce confusion.

Time Zone Tips

Watch for DST Transitions

Clocks spring forward or fall back on different dates in each hemisphere. Always verify DST status for both source and target zones.

Use Anchor Cities

Reference well-known cities like New York, London, or Tokyo instead of abbreviations. EST can mean Eastern Standard Time or Eastern Summer Time in Australia.

Remember Half-Hour Offsets

India (UTC+5:30), Iran (UTC+3:30), and Newfoundland (UTC-3:30) use 30-minute offsets that are easy to overlook in calculations.

Plan Meetings in UTC

When coordinating across three or more time zones, share times in UTC first, then let each participant convert to their local time.

Major Time Zones at a Glance

Major Time Zones at a Glance
AbbreviationFull NameUTC OffsetExample City
ESTEastern Standard TimeUTC-5New York
PSTPacific Standard TimeUTC-8Los Angeles
GMTGreenwich Mean TimeUTC+0London
CETCentral European TimeUTC+1Berlin
JSTJapan Standard TimeUTC+9Tokyo
AESTAustralian Eastern Standard TimeUTC+10Sydney

Frequently Asked Questions

How does the time zone converter work?▾
The converter uses the built-in Intl API and the IANA timezone database to calculate exact time differences between cities. It accounts for daylight saving time changes automatically.
Does it handle daylight saving time?▾
Yes. The converter uses real timezone rules from the IANA database, which includes all historical and current DST transitions. The hour difference may change when a region enters or exits DST.
Is my data safe?▾
Yes. All time calculations happen locally in your browser using built-in JavaScript APIs. No data is sent to any server.

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