Timezone Converter
A free timezone converter, time zone calculator, and time difference calculator that compares the current time across multiple cities at once. Convert PST to EST, UTC to EST, EST to GMT, or any other pair, and use it as a world clock converter and meeting planner for remote teams and travelers. It works as a time to time converter for any two zones, with daylight saving handled automatically, and you can add or remove rows as needed.
Common timezone differences
Quick reference for the most-searched timezone pairs.
| From | To | Standard time gap | During DST |
|---|---|---|---|
| New York (EST/EDT) | London (GMT/BST) | 5 hours behind | 4 hours behind (briefly) |
| New York (EST/EDT) | Los Angeles (PST/PDT) | 3 hours ahead | 3 hours ahead |
| New York (EST/EDT) | Tokyo (JST) | 14 hours behind | 13 hours behind |
| London (GMT/BST) | Dubai (GST) | 4 hours behind | 3 hours behind |
| London (GMT/BST) | Karachi (PKT) | 5 hours behind | 4 hours behind |
| London (GMT/BST) | Sydney (AEST/AEDT) | 10 hours behind | 9 to 11 (varies) |
| Karachi (PKT) | New York (EST/EDT) | 10 hours ahead | 9 hours ahead |
| Dubai (GST) | Singapore (SGT) | 4 hours behind | 4 hours behind |
What this tool does
Live updating clocks
Every timezone refreshes once per second so the times you see are current.
DST handled automatically
Daylight saving rules are applied per region. No manual adjustment needed.
Unlimited rows
Add as many timezones as your team or meeting requires.
27 popular zones included
From New York to Tokyo, Karachi to Sydney. All major business hubs covered.
Local time detected
Your local timezone shows automatically at the top of the list.
No signup, no ads
Free meeting planner that works the moment you open the page.
When you need a timezone converter
Remote team meetings
See everyone's local time at a glance. Schedule calls when most of the team is in working hours.
Client calls across borders
Avoid the embarrassment of calling at 3am. Confirm timing in their timezone before sending the invite.
Travel planning
See what time your friends and family are in while you are abroad. Plan check-in calls.
Live stream coordination
When you announce a stream as "8pm EST," your global audience needs to know what that is locally.
Forex and crypto trading
Market opens differ by region. Know exactly when the New York, London, and Tokyo sessions start and overlap.
International conference calls
Compare timezones for participants in 5 or 10 countries. Find a slot that works for the majority.
About timezones
How timezones work
A timezone is a region that observes the same standard time. There are 38 time zones currently in use worldwide, expressed as offsets from Coordinated Universal Time (UTC). New York is UTC-5 (5 hours behind UTC). Tokyo is UTC+9. The earth rotates 15 degrees per hour, which is why most timezone offsets are whole hours apart, though some regions use 30 or 45 minute offsets.
To convert between any two zones, the basic method is to go through UTC. Add the source zone's offset to reach UTC, then add the target zone's offset to land on the target time. A time zone converter does this for you, but knowing the steps explains why the answers come out the way they do, and why each zone offset matters.
Daylight saving time
Many countries shift their clocks forward by one hour in spring and back in autumn to better use daylight hours. The US calls this "Daylight Saving Time" and runs it from March to November. Europe calls it "Summer Time" and runs it from late March to late October. India, Pakistan, China, Japan, and most equatorial countries do not observe DST at all.
Why time gaps change during the year
Because countries switch to DST on different dates, the apparent gap between two cities changes throughout the year. New York and London are usually 5 hours apart, but for about two weeks in spring (March) they are only 4 hours apart because the US has switched but Europe has not yet. The gap returns to 5 once Europe switches.
Converting PST to EST and EST to PST
Pacific Time and Eastern Time are the two busiest US business zones, so converting PST to EST comes up constantly. Eastern Time is always 3 hours ahead of Pacific Time. To convert PST to EST, add 3 hours, so 9:00 AM PST is 12:00 PM EST. To convert EST to PST, subtract 3 hours, so 5:00 PM EST is 2:00 PM PST. Because both zones observe daylight saving on the same dates, the gap stays a steady 3 hours all year, whether the clocks read PST and EST in winter or PDT and EDT in summer.
UTC to EST, UTC to PST, and Zulu time
UTC is the global reference, so a lot of scheduling starts with a UTC to EST or UTC to PST conversion. Eastern Time is UTC-5 in winter and UTC-4 during daylight saving, so to convert UTC to EST you subtract 5 hours (or 4 in summer). Pacific Time is UTC-8 in winter and UTC-7 in summer, so a UTC to PST conversion subtracts 8 hours (or 7 in summer). Zulu time is simply another name for UTC, used in aviation and the military, so a Zulu time converter and a UTC converter do exactly the same job: 1500Z is 1500 UTC.
EST to GMT and Eastern Time to GMT
Converting EST to GMT links US Eastern Time with the UK reference time. Standard Eastern Time is 5 hours behind GMT, so 8:00 AM EST is 1:00 PM GMT. The catch is daylight saving: the US and UK switch on different dates and the UK runs British Summer Time (BST), so the real gap drifts between 4 and 5 hours through the year. For a precise Eastern Time to GMT answer on any date, use the converter above, which applies each region's daylight saving rules automatically.
Using the time difference calculator and world clock
Beyond single conversions, this tool works as a time difference calculator and a world clock converter. Add a row for every city you care about and read the gaps straight off the live clocks instead of doing arithmetic. That makes it a true time zone calculator: you can see, for example, that when it is 9:00 AM in London it is 4:00 AM in New York and 5:00 PM in Singapore, all at a glance.
For meeting planning, the same view doubles as a scheduling aid. Add each participant's zone, then look for a row of times that all fall inside working hours. Times before 9:00 AM or after 6:00 PM flag a slot that will not work for someone, which is faster and safer than converting each person's time by hand.
UTC to PST and Pacific Time to GMT
Pacific Time is the busiest US west coast zone, so UTC to PST and Pacific Time to GMT conversions come up often in scheduling. Pacific Time is UTC-8 in winter and UTC-7 during daylight saving, so a UTC to PST conversion subtracts 8 hours (or 7 in summer). For example, 20:00 UTC is 12:00 PM PST in winter. Going the other way, a Pacific Time to GMT conversion adds 8 hours in winter, since GMT sits on the UTC reference and PST is 8 hours behind it. That puts 9:00 AM PST at 5:00 PM GMT.
The wrinkle is daylight saving on both ends: the US shifts Pacific Time and the UK shifts to British Summer Time on different dates, so the real Pacific Time to GMT gap moves between 7 and 8 hours through the year. The converter above tracks each region's daylight saving rules, so you get the correct offset for the current date without checking a calendar.
Time to time converter for any city pair
Beyond the named US and UK zones, this works as a general time to time converter for any two cities on the planet. Pick a source city, pick a target city, and the live clocks show the current time in each, with the gap visible at a glance. That covers the common searches people run, such as comparing New York with Tokyo, London with Singapore, or Sydney with Los Angeles, without having to remember any individual UTC offset.
Because the tool reads daylight saving rules per region, a time to time converter result is correct year round. When one city is on summer time and the other is not, the gap shifts by an hour, and the converter reflects that automatically. This is what separates a reliable time zone calculator from a static offset table that quietly goes wrong twice a year.
Using a time zone converter with date
A common need is a time zone converter with date, not just the current hour: knowing what a future meeting time lands on in another city, including whether it falls on a different calendar day. Time zones near the International Date Line can put two participants on different dates at the same moment. When it is 9:00 AM Monday in Los Angeles, it is already 2:00 AM Tuesday in Sydney, so a call that feels like "Monday morning" to one person is "early Tuesday" for the other.
The live world clock view makes the date difference obvious, because each row shows the local time and you can see when a city has already crossed midnight. For a future date, the key check is whether daylight saving is active on that date in either zone, since that shifts the gap by an hour. When both cities sit inside the same daylight saving period as today, the offset shown now applies to that date as well.
World clock converter and time zone calculator features
Used with several rows open, this becomes a full world clock converter: a single screen showing the current time in every city your team or family spans. Each clock updates once per second, so the times stay accurate to the moment, and your own local zone is detected and shown at the top. It is also a time zone calculator, because the gap between any two rows is the time difference you would otherwise work out by hand.
For meeting planning, scan across the rows for a band of times that all sit inside working hours, roughly 9:00 AM to 6:00 PM. Any row showing an early morning or late evening time flags a slot that will not suit someone. This turns the world clock converter into a practical scheduling aid for remote teams, international clients, and cross-border conference calls.
Reading timezone names
Timezone names like "America/New_York" or "Asia/Tokyo" come from the IANA Timezone Database, which is used by every operating system and programming language. The format is Region/City. Some timezones have multiple names for the same offset (Asia/Calcutta and Asia/Kolkata both refer to India Standard Time, for example) for historical and naming reasons.
Click the dropdown on any row and select the city or region you want. The time updates instantly and refreshes every second so it stays accurate to the moment.
Yes. The converter uses the JavaScript Intl API which automatically applies daylight saving rules for every timezone. So New York shows EDT in summer and EST in winter without any manual switching.
Click the "Add timezone" button below the rows. A new row appears, defaulting to UTC. Change it to your needed city using the dropdown. Add as many as you need for your meeting planning.
Add a row for each participant's timezone. Compare all the times at a glance to find a slot that works for everyone. Times outside business hours (before 9am or after 6pm) tell you it won't work for that person.
London is 5 hours ahead of New York during winter (EST) and 4 hours ahead during summer (EDT and BST overlap). The exact gap varies because the two regions switch to daylight saving on different dates.
Tokyo is 13 hours ahead of New York during winter (EST) and 14 hours ahead during summer (EDT). Japan does not observe daylight saving, so when New York moves forward in spring, the gap increases.
There are 38 timezones currently in use, ranging from UTC-12 to UTC+14. Some regions use 30 or 45 minute offsets (India is UTC+5:30, Nepal is UTC+5:45, parts of Australia use UTC+9:30).
Pakistan Standard Time is exactly 5 hours ahead of UTC. India Standard Time is 5 hours 30 minutes ahead. The difference is a 30-minute offset India chose at independence in 1947 to standardize across its eastern and western regions.
The tool shows hours and minutes which is what people need for meeting planning and call coordination. Adding seconds would be visual noise without practical value for most use cases.
Your browser determines your local timezone from system settings. If it is wrong, check your computer's timezone setting. The tool simply displays what your device reports.
Eastern Time is always 3 hours ahead of Pacific Time, so to convert PST to EST you add 3 hours. For example, 9:00 AM PST is 12:00 PM EST. Both zones observe daylight saving on the same dates, so the 3-hour gap stays the same all year whether the clocks read PST/EST in winter or PDT/EDT in summer.
To convert EST to PST, subtract 3 hours, because Pacific Time is 3 hours behind Eastern Time. So 5:00 PM EST is 2:00 PM PST. The gap is a steady 3 hours throughout the year since both zones change their clocks on the same dates.
Eastern Time is UTC-5 during standard time and UTC-4 during daylight saving, so to convert UTC to EST you subtract 5 hours in winter and 4 hours in summer. For example, 18:00 UTC is 1:00 PM EST in winter. The converter above applies the correct offset automatically based on the date.
Pacific Time is UTC-8 during standard time and UTC-7 during daylight saving, so a UTC to PST conversion subtracts 8 hours in winter and 7 hours in summer. For example, 20:00 UTC is 12:00 PM PST in winter. Use the live tool to get the right offset without tracking daylight saving dates yourself.
Zulu time is another name for UTC, used in aviation, the military, and weather reporting, written with a Z suffix such as 1500Z. Converting Zulu time is identical to converting UTC, so a Zulu time converter and a UTC converter give the same result. To reach a local zone, apply that zone's UTC offset to the Zulu time.
Standard Eastern Time is 5 hours behind GMT, so to convert EST to GMT you add 5 hours, making 8:00 AM EST equal to 1:00 PM GMT. The real gap drifts between 4 and 5 hours through the year because the US and UK switch to daylight saving on different dates and the UK uses British Summer Time. The converter handles those shifts for you.
Add a row for each city in the converter and read the times side by side; the difference is the gap between them. This works as a time difference calculator and world clock converter without any manual arithmetic. Because daylight saving is applied automatically, the difference shown is correct for the current date.
The converter shows live current time, which covers most meeting planning. For a future or past date, the key thing to check is whether daylight saving is active on that date in either zone, since that can shift the gap by an hour. When both cities are inside the same DST period, the offset shown today applies to that date too.
Standard Pacific Time is 8 hours behind GMT, so to convert Pacific Time to GMT you add 8 hours, making 9:00 AM PST equal to 5:00 PM GMT. The real gap moves between 7 and 8 hours during the year because the US and UK switch to daylight saving on different dates. The converter above applies both regions' rules so the result is correct for any date.
A time to time converter compares the current time in two cities so you can see the gap instantly. Pick a source city and a target city, and the live clocks show each local time without you needing any UTC offset. Because daylight saving is applied per region, the result stays accurate all year, even when one city is on summer time and the other is not.
Yes. The world clock view shows the full local time in each city, so you can see when a city has already crossed midnight into the next day. Zones near the International Date Line can place two participants on different calendar dates at the same moment, and the live clocks make that clear. For a future date, just confirm whether daylight saving is active on that date in either zone.
A world clock converter shows the current time in many cities at once on a single screen, with each clock updating every second. This tool works as a world clock converter when you add several rows, and it detects your own local zone automatically. It is useful for remote teams, travelers, and anyone who needs to track time across multiple countries.
As a time zone calculator, the tool gives you the difference between any two zones simply by reading the gap between their rows. There is no manual arithmetic and no need to memorize UTC offsets. Daylight saving is handled automatically, so the calculated difference is always correct for the current date.