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Times are calculated from the entered date/time treated as UTC, then converted into each selected zone, useful for comparing the same instant across regions.
Convert a Time Across Time Zones
The Tools Kit’s free Timezone Converter takes one date and time and shows the same moment in several world time zones side by side, so you can see what time a meeting, a launch, or a deadline falls on in New York, London, Dubai, Karachi, Kolkata, Tokyo or Sydney without doing offset math in your head.
The time you type is read as UTC (Coordinated Universal Time), then converted into each zone you select using your browser’s built-in time zone data, which also applies daylight saving time for the date you chose. Everything runs in your browser; nothing is uploaded.
How to Use the Timezone Converter
- 1
Enter the date and time in UTC
Pick a date and a time to the minute in the Date & Time field. The converter treats whatever you type as Coordinated Universal Time (UTC).
- 2
Choose the time zones to compare
Click any of the 21 zone buttons to add it to the comparison; click a highlighted button again to remove it. New York, London and Karachi are selected when the page loads.
- 3
Read the converted times
Each selected zone shows the same moment as a local date and time, with daylight saving time already applied for that date.
- 4
Copy a result
Press Copy on any zone card to copy the formatted date and time together with the zone name, ready to paste into a message or calendar invite.
The “Interpreted As” dropdown beside the date field is a reference label only: the calculation always treats your input as UTC, whatever the dropdown shows.
Converting Local Time to UTC First
Because the input is UTC, start by turning your own local time into UTC. Subtract the zone’s UTC offset if it is ahead of UTC, or add it if it is behind:
- New York, summer (UTC-4): 9:00 AM local + 4 hours = 13:00 UTC.
- New York, winter (UTC-5): 9:00 AM local + 5 hours = 14:00 UTC.
- Karachi (UTC+5): 7:00 PM local − 5 hours = 14:00 UTC.
- Kolkata (UTC+5:30): 7:30 PM local − 5 hours 30 minutes = 14:00 UTC.
A quick way to check your answer is to select your own zone as one of the targets: if the card for your zone shows the local time you started with, the UTC value is right. If you are working from a Unix timestamp in a log file or API response rather than a clock time, the Unix timestamp converter turns it into a readable UTC date you can paste in here.
Worked Example: One Meeting Time, Summer and Winter
Here is 14:00 UTC on July 15, 2026 and on January 15, 2026, converted into a spread of the included zones. The same UTC time lands an hour apart in some cities depending on the season, because of daylight saving time.
| Time zone | 14:00 UTC, Jul 15, 2026 | 14:00 UTC, Jan 15, 2026 |
|---|---|---|
| UTC | Jul 15, 2:00 PM | Jan 15, 2:00 PM |
| America/Los_Angeles | Jul 15, 7:00 AM | Jan 15, 6:00 AM |
| America/New_York | Jul 15, 10:00 AM | Jan 15, 9:00 AM |
| America/Sao_Paulo | Jul 15, 11:00 AM | Jan 15, 11:00 AM |
| Europe/London | Jul 15, 3:00 PM | Jan 15, 2:00 PM |
| Europe/Paris | Jul 15, 4:00 PM | Jan 15, 3:00 PM |
| Asia/Dubai | Jul 15, 6:00 PM | Jan 15, 6:00 PM |
| Asia/Karachi | Jul 15, 7:00 PM | Jan 15, 7:00 PM |
| Asia/Kolkata | Jul 15, 7:30 PM | Jan 15, 7:30 PM |
| Asia/Tokyo | Jul 15, 11:00 PM | Jan 15, 11:00 PM |
| Australia/Sydney | Jul 16, 12:00 AM | Jan 16, 1:00 AM |
| Pacific/Auckland | Jul 16, 2:00 AM | Jan 16, 3:00 AM |
Three patterns stand out. New York, Los Angeles, London and Paris move by an hour between the two dates because they observe daylight saving in the northern summer. Sydney and Auckland move the other way because their summer is in January. Dubai, Karachi, Kolkata and Tokyo do not change at all, since those zones do not use daylight saving time. Sydney and Auckland are also already on the next calendar day, so check the date on each card as well as the time.
Time Zones, UTC Offsets and Daylight Saving Time
Every time zone is defined by its offset from UTC. Most offsets are whole hours, but some are not: India runs on UTC+5:30, which is why Kolkata’s times end in :30 when the UTC input is on the hour. Offsets also change during the year in regions that use daylight saving time, and the switch dates differ: the US changes its clocks on different weekends from the UK and the EU in spring and autumn, so the gap between New York and London is briefly one hour smaller than usual for a few weeks a year.
This is why the converter uses region names such as America/New_York instead of a fixed “UTC-5” label. The name carries the region’s full rule set, so the offset is always the one in force on the date you entered. For a quick estimate of whole calendar days between two dates, for example how long until an overseas event, use the days calculator.
Common uses
- Scheduling a video call or meeting across teams in several countries
- Announcing a webinar, product launch or live stream for an international audience
- Checking when a UTC-scheduled server job will run in local time, alongside a cron expression generator for the schedule itself
- Logging shifts for remote or overseas work in local time before adding them up with the time card calculator
- Planning an international trip, together with the currency converter and the vacation budget calculator
- Comparing support or store hours for offices in different regions
More unit, data and format tools are collected on the conversion tools page.
Time zone terms explained
| Term | What it means here |
|---|---|
| UTC | Coordinated Universal Time, the reference clock every other zone is measured from; the converter reads your input as UTC |
| GMT | Greenwich Mean Time; for everyday scheduling it shows the same clock time as UTC, and it is the UK’s winter time |
| UTC offset | How far a zone is ahead of (+) or behind (-) UTC, such as UTC+5 for Pakistan or UTC-5 for New York in winter |
| Daylight saving time (DST) | A seasonal clock change, usually one hour forward in spring and back in autumn, which changes a zone’s offset for part of the year |
| IANA zone name | A region-based identifier such as Europe/London or Asia/Kolkata; it carries the full history of that region’s offsets and DST rules |
| Wall-clock time | The local time a clock on the wall shows in a place, as opposed to the single instant it represents worldwide |
Frequently Asked Questions
Enter the date and time in UTC, select the zones you want, and read the converted local time on each card. If your starting time is local, first change it to UTC by subtracting the zone’s offset: 9:00 AM in New York during daylight saving time (UTC-4) is 13:00 UTC.
Always UTC. The Date & Time field has no zone attached, and the converter reads the value as a UTC time before converting it into each selected zone. The "Interpreted As" dropdown next to it is a reference label only and does not change the result.
Yes. Each result is formatted with your browser’s built-in Intl time zone data, which applies the daylight saving rules in force for that zone on the date you entered. For example, 14:00 UTC is 10:00 AM in New York on July 15, 2026 but 9:00 AM on January 15, 2026.
There are 21: UTC, New York, Chicago, Denver, Los Angeles, Sao Paulo, London, Paris, Berlin, Moscow, Cairo, Dubai, Karachi, Kolkata, Dhaka, Bangkok, Shanghai, Tokyo, Seoul, Sydney and Auckland. Each button uses its IANA name, such as America/New_York or Asia/Kolkata.
Not in the current version. The list is fixed at 21 zones covering the Americas, Europe, Africa, the Middle East, South and East Asia, and Australia and New Zealand. Pick the listed zone that shares your offset, for example America/New_York for Toronto.
India Standard Time (Asia/Kolkata) is UTC+5:30 all year, with no daylight saving time. 14:00 UTC is 7:30 PM in India. The half-hour offset is why India’s times end in :30 when the UTC input is on the hour.
Pakistan Standard Time (Asia/Karachi) is UTC+5 all year. The UK is UTC+0 in winter (GMT) and UTC+1 in summer (BST). So Karachi is five hours ahead of London in winter and four hours ahead in summer: 14:00 UTC is 7:00 PM in Karachi, and 2:00 PM in London in January or 3:00 PM in July.
Zones far ahead of or behind UTC can already be on the next day, or still on the previous one. 14:00 UTC on July 15, 2026 is midnight on July 16 in Sydney and 2:00 AM on July 16 in Auckland. Always check the date on each card, not only the time.
For scheduling purposes they show the same clock time. UTC is the atomic-clock standard used by computers and aviation; GMT is a time zone name used by the UK and some other countries in winter. The UK switches to BST (UTC+1) in summer, while UTC never changes.
No. The conversion runs entirely in your browser using the built-in Intl.DateTimeFormat API. Nothing you enter is uploaded, and the tool is free with no signup.
Reviewed by Raja Jahangir · Last reviewed: October 7, 2026
How do you convert a time across multiple time zones?
To convert a time across time zones, enter a date and time, then select the zones to compare from 21 options including UTC, New York, London, Paris, Dubai, Karachi, Kolkata, Tokyo, and Sydney. The entered time is treated as UTC and shown in every selected zone at once, with daylight saving applied automatically by the browser's Intl data.
What is the time difference between Pakistan and the UK?
Pakistan Standard Time is UTC+5 all year. The UK is UTC+0 in winter (GMT) and UTC+1 in summer (BST, late March to late October). So Karachi is five hours ahead of London in winter and four hours ahead in summer: 14:00 in Karachi is 09:00 GMT or 10:00 BST.