FreeKit is a collection of free online tools for developers, SEO professionals, designers, students, content creators, and everyday users.

Are all tools completely free?

Yes. Every tool on FreeKit is free to use without subscriptions or hidden charges.

Do I need to create an account?

No. You can use all tools instantly without creating an account.

No. Most tools process data locally in your browser, and we do not permanently store your inputs.

Can I use FreeKit on mobile devices?

Yes. Every tool is fully responsive and works on smartphones, tablets, laptops, and desktop computers.

How often are new tools added?

We regularly add new tools and improve existing ones based on user feedback and industry needs.

Which browsers are supported?

FreeKit supports all modern browsers, including Chrome, Edge, Firefox, Safari, and other Chromium-based browsers.

Can I share these tools with others?

Absolutely. You are welcome to share FreeKit with friends, colleagues, students, and your team.

What are time zones and why do they exist?

Time zones are regions of the Earth that observe a uniform standard time for legal, commercial, and social purposes. They exist because the Earth rotates approximately 15 degrees of longitude per hour, meaning the sun's position (and therefore local solar time) differs across the globe. Without time zones, noon in New York and noon in Tokyo would refer to completely different moments in the day. Time zones simplify scheduling, transportation, and communication by grouping nearby areas into shared time standards.

What is the difference between UTC and GMT?

UTC (Coordinated Universal Time) is the primary time standard by which the world regulates clocks and time. It is based on International Atomic Time (TAI) with leap seconds added to keep it within 0.9 seconds of UT1 (solar time). GMT (Greenwich Mean Time) is a time zone used in the UK and parts of West Africa during winter. Historically, GMT was based on astronomical observations at the Royal Observatory in Greenwich. While UTC and GMT share the same current time, UTC is a time standard (not a time zone) used as the basis for all other time zones via offsets like UTC+5:30 or UTC-8.

What is daylight saving time (DST) and which countries use it?

Daylight saving time (DST) is the practice of advancing clocks by one hour during warmer months so that darkness falls later in the evening. Typically, DST starts in spring (clocks move forward) and ends in autumn (clocks move back). Countries that currently observe DST include the United States, Canada, most of Europe, parts of Australia, and New Zealand. Many countries near the equator (like India, Japan, and most of Southeast Asia) do not observe DST because their daylight hours vary little throughout the year. This converter uses the Intl.DateTimeFormat API which automatically handles DST transitions.

How do I convert time between two time zones?

To convert time between zones, first determine the UTC offset of both time zones (e.g., EST is UTC-5 and IST is UTC+5:30). Then calculate the difference between the two offsets and add or subtract that difference from the source time. For example, converting 10:00 AM EST to IST: the difference is +10 hours 30 minutes, so the result is 8:30 PM IST. Our converter handles this automatically — simply select the source time zone, enter the date and time, select the target time zone, and the converted time is displayed instantly. The tool also accounts for daylight saving time automatically.

What is the International Date Line?

The International Date Line (IDL) is an imaginary line on the Earth's surface that roughly follows the 180th meridian in the Pacific Ocean. When you cross the IDL from west to east, you subtract one calendar day; crossing from east to west, you add one calendar day. For example, when it is Monday at 10 AM in New Zealand (UTC+12), it is Sunday at 10 AM in Hawaii (UTC-10) — a 22-hour difference. The IDL has some zigzags to avoid splitting countries and island groups (e.g., it bends east around Kiribati). This converter correctly handles date changes that result from crossing the IDL.

How do I find the best time for a meeting across time zones?

To find a good meeting time across zones, first list all participant time zones and their current UTC offsets. Look for an overlap where all participants are between 9 AM and 6 PM in their local time. For example, 9 AM in New York (UTC-5) equals 2 PM in London (UTC+0) and 7:30 PM in New Delhi (UTC+5:30) — a reasonable overlap for a three-region meeting. For teams spanning Asia, Europe, and the Americas, overlap windows are narrow (often 8-10 AM in Europe, 2-4 PM in Asia). Use the 'Quick Compare' feature in this tool to view multiple time zones simultaneously and identify suitable windows.

What do common time zone abbreviations like EST, PST, and CET mean?

Time zone abbreviations are short codes for standard or daylight time: EST (Eastern Standard Time, UTC-5) covers the US East Coast; CST (Central Standard Time, UTC-6) covers the US Midwest; MST (Mountain Standard Time, UTC-7) covers the US Mountain states; PST (Pacific Standard Time, UTC-8) covers the US West Coast. In Europe: CET (Central European Time, UTC+1) covers most of Western Europe; EET (Eastern European Time, UTC+2) covers Eastern Europe. In Asia: IST (India Standard Time, UTC+5:30), JST (Japan Standard Time, UTC+9), CST (China Standard Time, UTC+8). Note that abbreviations can be ambiguous — CST can mean Central Standard Time (US), China Standard Time, or Cuba Standard Time.

What is the difference between IST, EST, and PST?

IST (India Standard Time) is UTC+5:30, used throughout India with no daylight saving time. EST (Eastern Standard Time) is UTC-5, used on the US East Coast and parts of Canada and South America during winter; in summer it becomes EDT (UTC-4). PST (Pacific Standard Time) is UTC-8, used on the US West Coast during winter; in summer it becomes PDT (UTC-7). The difference between IST and EST is 10 hours 30 minutes (IST is ahead), while EST and PST differ by 3 hours (EST is ahead). These conversions are handled automatically by this tool, including the DST variations.

How do I schedule events across multiple time zones?

The best practice for scheduling across time zones is to always communicate the time in UTC along with at least one local time zone. For recurring events, always specify the time zone explicitly (e.g., '3 PM Eastern Time') rather than a relative reference. Use calendar applications like Google Calendar or Outlook that support time zone-aware event creation. When planning, use the 'Quick Compare' feature in this tool to view 3-4 time zones at once and find the best overlapping hours. For international teams, consider rotating meeting times to share the inconvenience of off-hours calls fairly.

What are military time zones (Alpha, Bravo, Charlie, etc.)?

Military time zones, also known as NATO phonetic alphabet zones, are a system used by the military and aviation to designate time zones. Each zone is assigned a letter from A to Z (excluding J): Z (Zulu) = UTC+0, A (Alpha) = UTC+1, B (Bravo) = UTC+2, and so on through M (Mike) = UTC+12. For zones west of UTC, letters continue: N (November) = UTC-1, O (Oscar) = UTC-2, through Y (Yankee) = UTC-12. The most commonly referenced is Zulu time (UTC), used universally in aviation and military operations. When someone says 'the meeting is at 1400 Zulu,' that means 2:00 PM UTC.

Time Zone Converter

Convert times between different time zones around the world.

BeginnerCalculatorsFreev1.0.0Updated Jul 22, 2025

Convert Time Between Zones

Select time zones, pick a date and time, and get instant conversions

From Time Zone

To Time Zone

Date

Time

Current Time — EST/EDT (New York)GMT-4

02:57:25 PM

Current Time — GMT/BST (London)GMT+1

07:57:25 PM

2026-08-11 at 18:57 EST/EDT (New York) (GMT-4)

12:57:00 AM

Wednesday, August 12, 2026 — GMT/BST (London) (GMT+1)

Date changed due to time zone difference

Quick Compare

View current time in multiple zones simultaneously

Click “Add Zone” to compare current time across multiple zones

100% Private — Runs in Your Browser

All time zone conversions use the built-in Intl.DateTimeFormat API. Your date and time selections are never sent to any server, stored, or shared. DST transitions are handled automatically by your browser.

How to Convert Time Between Time Zones

Converting time between zones is simple and instant:

Select the “From” time zone — Choose the source time zone from the dropdown (e.g., Eastern Time for New York).
Select the “To” time zone — Choose the target time zone (e.g., Japan Standard Time for Tokyo).
Enter a date and time — The inputs default to your current date and time. Adjust as needed or click “Use Current Time.”
View the result — The converted time appears instantly with the date, day of the week, and UTC offsets for both zones.

Features

Supports 25+ major world time zones across 6 continents
Automatic daylight saving time (DST) handling via the browser's Intl API
Live-updating clocks showing current time in both selected zones
UTC offset badges for instant reference (e.g., UTC-5, UTC+9)
Quick Compare: add up to 4 extra zones and see all times at a glance
Swap button to instantly reverse the from/to zones
Date change detection when the conversion crosses midnight
100% client-side — no data sent to any server

Understanding Time Zones

UTC — The Universal Standard

UTC (Coordinated Universal Time) is the world's primary time standard. All other time zones are expressed as offsets from UTC — for example, EST is UTC-5 and JST is UTC+9. UTC never observes daylight saving time, making it ideal for international scheduling and technical applications.

Daylight Saving Time (DST)

Many regions advance their clocks by one hour during summer months. This means the UTC offset changes twice a year — for example, New York shifts from UTC-5 (EST) to UTC-4 (EDT). This converter handles DST automatically using your browser's built-in time zone database.

IANA Time Zone Names

The Internet Assigned Numbers Authority (IANA) maintains a database of time zones using identifiers like “America/New_York” and “Asia/Tokyo.” These are more reliable than abbreviations because they encode the full geographic and historical rules for each zone, including DST transitions.

Time Zone Abbreviations

Abbreviations like EST, PST, and IST are convenient but can be ambiguous. For example, CST can mean Central Standard Time (US), China Standard Time, or Cuba Standard Time. This converter shows both the abbreviation and the full IANA name to avoid confusion.

Common Use Cases

Scheduling International Meetings

Find a time that works for participants in New York, London, and Tokyo by using the Quick Compare feature to view all zones simultaneously.

Booking Flights and Travel

Convert departure and arrival times to your home time zone to plan layovers, airport arrivals, and hotel check-ins.

Remote Team Coordination

Distributed teams can use the converter to find overlapping work hours and set fair rotating meeting schedules.

Webinar and Event Planning

Announce event times in multiple zones so attendees worldwide know exactly when to join.

Software Development

Convert timestamps and deadlines between server time (often UTC) and local time zones for debugging and deployment.

Financial Trading

Convert market open and close times (e.g., NYSE, LSE, TSE) to your local time to plan trading activities.

Major World Time Zones

Zone	Region	UTC Offset
UTC	Reference	UTC±0
EST/EDT	US East Coast	UTC-5 / UTC-4
CST/CDT	US Central	UTC-6 / UTC-5
MST/MDT	US Mountain	UTC-7 / UTC-6
PST/PDT	US West Coast	UTC-8 / UTC-7
GMT/BST	United Kingdom	UTC±0 / UTC+1
CET/CEST	Central Europe	UTC+1 / UTC+2
IST	India	UTC+5:30
GST	UAE / Gulf	UTC+4
JST	Japan	UTC+9
AEST/AEDT	Australia East	UTC+10 / UTC+11
NZST/NZDT	New Zealand	UTC+12 / UTC+13

Tips for Working Across Time Zones

Always communicate meeting times in at least two time zones to avoid confusion.
Use the Quick Compare feature to find overlapping business hours across regions.
For recurring meetings with global teams, consider rotating the schedule so the same region isn't always inconvenienced.
When booking flights, always verify times in both the departure and arrival time zones.
Store all times in UTC in databases and convert to local time only for display — this avoids ambiguity.
Remember that some countries do not observe DST (e.g., India, Japan), so offsets stay constant year-round.
Need to find the number of days between dates? Try our Days Between Dates Calculator.
Want to calculate your exact age? Use our Age Calculator.
Need to convert between units of measurement? Try our Unit Converter.
Looking for percentage-based calculations? Our Percentage Calculator has you covered.

Frequently Asked Questions

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How to Convert Time Between Time Zones

Converting time between zones is simple and instant:

Select the “From” time zone — Choose the source time zone from the dropdown (e.g., Eastern Time for New York).

Select the “To” time zone — Choose the target time zone (e.g., Japan Standard Time for Tokyo).

Enter a date and time — The inputs default to your current date and time. Adjust as needed or click “Use Current Time.”

View the result — The converted time appears instantly with the date, day of the week, and UTC offsets for both zones.

Features

Supports 25+ major world time zones across 6 continents

Automatic daylight saving time (DST) handling via the browser's Intl API

Live-updating clocks showing current time in both selected zones

UTC offset badges for instant reference (e.g., UTC-5, UTC+9)

Quick Compare: add up to 4 extra zones and see all times at a glance

Swap button to instantly reverse the from/to zones

Date change detection when the conversion crosses midnight

100% client-side — no data sent to any server

Understanding Time Zones

UTC — The Universal Standard

Daylight Saving Time (DST)

IANA Time Zone Names

Time Zone Abbreviations

Common Use Cases

Scheduling International Meetings

Find a time that works for participants in New York, London, and Tokyo by using the Quick Compare feature to view all zones simultaneously.

Booking Flights and Travel

Convert departure and arrival times to your home time zone to plan layovers, airport arrivals, and hotel check-ins.

Remote Team Coordination

Distributed teams can use the converter to find overlapping work hours and set fair rotating meeting schedules.

Webinar and Event Planning

Announce event times in multiple zones so attendees worldwide know exactly when to join.

Software Development

Convert timestamps and deadlines between server time (often UTC) and local time zones for debugging and deployment.

Financial Trading

Convert market open and close times (e.g., NYSE, LSE, TSE) to your local time to plan trading activities.

Major World Time Zones

Zone	Region	UTC Offset
UTC	Reference	UTC±0
EST/EDT	US East Coast	UTC-5 / UTC-4
CST/CDT	US Central	UTC-6 / UTC-5
MST/MDT	US Mountain	UTC-7 / UTC-6
PST/PDT	US West Coast	UTC-8 / UTC-7
GMT/BST	United Kingdom	UTC±0 / UTC+1
CET/CEST	Central Europe	UTC+1 / UTC+2
IST	India	UTC+5:30
GST	UAE / Gulf	UTC+4
JST	Japan	UTC+9
AEST/AEDT	Australia East	UTC+10 / UTC+11
NZST/NZDT	New Zealand	UTC+12 / UTC+13

Tips for Working Across Time Zones

Always communicate meeting times in at least two time zones to avoid confusion.

Use the Quick Compare feature to find overlapping business hours across regions.

For recurring meetings with global teams, consider rotating the schedule so the same region isn't always inconvenienced.

When booking flights, always verify times in both the departure and arrival time zones.

Store all times in UTC in databases and convert to local time only for display — this avoids ambiguity.

Remember that some countries do not observe DST (e.g., India, Japan), so offsets stay constant year-round.

Need to find the number of days between dates? Try our Days Between Dates Calculator.

Want to calculate your exact age? Use our Age Calculator.

Need to convert between units of measurement? Try our Unit Converter.

Looking for percentage-based calculations? Our Percentage Calculator has you covered.

Frequently Asked Questions