What is the difference between UTC and GMT?

UTC (Coordinated Universal Time) is the primary time standard by which the world regulates clocks. GMT (Greenwich Mean Time) is a time zone offset from UTC+0. For practical purposes they are the same, but UTC is the scientific standard while GMT is a time zone. UTC is never adjusted for daylight saving time.

Why do I need IANA time zones instead of UTC offsets?

UTC offsets like +05:30 do not capture daylight saving time changes. IANA zone names like America/New_York correctly model DST: New York is UTC-5 in winter and UTC-4 in summer. Using IANA zones ensures correct conversions year-round.

What is DST and how does it affect time conversion?

Daylight Saving Time (DST) is the practice of advancing clocks by one hour during summer months in many regions. A time in America/Los_Angeles is UTC-8 in winter (PST) but UTC-7 in summer (PDT). The converter applies the correct offset based on the selected date.

Can I find a good meeting time for multiple time zones?

Yes. Add multiple target time zones and the tool shows all of them for any given source time. Compare morning and afternoon slots in your zone to find a reasonable overlap window for all participants.

Is the conversion accurate for historical dates?

Yes. The tool uses the IANA timezone database which includes historical DST rules, so conversions for past dates use the correct rules that were in effect at that time, not today's rules.

All Tools›Productivity›

Timezone Converter

Free · No Server

Compare times across multiple timezones with live refresh and meeting planner mode.

Reference Date & Time

Timezones(5 selected)

Local

UTC

UTC · UTC+0

Thu, Jun 11, 2026

12:46:26 AM

New York, America

Yesterday

America/New_York · UTC-4

Wed, Jun 10, 2026

08:46:26 PM

London, Europe

Europe/London · UTC+1

Thu, Jun 11, 2026

01:46:26 AM

Kolkata, Asia

Asia/Kolkata · UTC+5:30

Thu, Jun 11, 2026

06:16:26 AM

Tokyo, Asia

Asia/Tokyo · UTC+9

Thu, Jun 11, 2026

09:46:26 AM

31 more available

What is Timezone Converter?

The Timezone Converter on AiTechWorlds converts times between any two IANA time zones instantly, with full daylight saving time (DST) awareness. Distributed teams, international deployments, and global APIs all demand accurate timezone handling. Getting it wrong causes missed meetings, incorrect log timestamps, and scheduling bugs. This tool covers all 500+ IANA time zones (America/New_York, Europe/London, Asia/Tokyo, etc.), correctly applies current and historical DST rules, and shows the UTC offset for each zone at the selected date and time. You can convert a specific moment in time, see a comparison table for multiple zones simultaneously, or find the best overlap time for a meeting across several time zones. All conversion runs in your browser — no data is sent to any server. AiTechWorlds built this for globally distributed development teams and developers handling international scheduling.

How to Use

1
Select source timezone
Choose your source time zone from the searchable IANA timezone dropdown.
2
Enter date and time
Enter the date and time you want to convert.
3
Select target timezone
Choose one or more target time zones to convert to.
4
View the result
The converted time, UTC offset, and DST status appear instantly for each target zone.
5
Add more zones
Add additional time zones to compare multiple locations simultaneously for meeting planning.

Common Use Cases

Remote teams scheduling meetings across US, EU, and APAC time zones
Backend developers converting API timestamp values to local time for logging
DevOps engineers scheduling deployments during low-traffic windows in specific regions
Frontend developers displaying UTC server times in the user's local timezone
Event planners communicating event times to international audiences

Key Features

Supports all 500+ IANA time zones
Full DST awareness with correct offset at the selected date
Multi-zone comparison table for meeting planning
UTC offset display for each zone
Searchable timezone dropdown
100% browser-based — no server call
Highlights time zone differences visually

🔒

100% Private — No Server Required

All processing happens directly in your browser. No data is uploaded, stored, or transmitted to any server.

Frequently Asked Questions

Related Free Tools

Cron Builder Date Calculator Readability Checker Timestamp Converter Word Counter Pomodoro Timer CSV ↔ JSON Converter YAML ↔ JSON Converter

AiTechWorlds

What is Timezone Converter?

How to Use

Select source timezone

Choose your source time zone from the searchable IANA timezone dropdown.

Enter date and time

Enter the date and time you want to convert.

Select target timezone

Choose one or more target time zones to convert to.

View the result

The converted time, UTC offset, and DST status appear instantly for each target zone.

Add more zones

Add additional time zones to compare multiple locations simultaneously for meeting planning.

Common Use Cases

Remote teams scheduling meetings across US, EU, and APAC time zones

Backend developers converting API timestamp values to local time for logging

DevOps engineers scheduling deployments during low-traffic windows in specific regions

Frontend developers displaying UTC server times in the user's local timezone

Event planners communicating event times to international audiences