Time Zone Converter & World Clock — EST, PST, IST, PKT & 80+ Cities
Convert times between any cities instantly — PKT to EST, IST to PST, GMT to IST, EST to JST, and more. Keep a live multiple time zone clock online for all your key locations with analog clocks, DST support, and 12/24h toggle.
What Is a Time Zone Converter?
A time zone converter translates a specific date and time from one location to another, accounting for UTC offsets and daylight saving time rules. This free time zone converter with DST support covers 80+ cities across every time zone — from PKT to EST, IST to PST, GMT to IST, EST to JST, and every other combination. Select your source city, enter a date and time, and see the converted result for as many destination cities as you need — all in one view.
Popular Time Zone Conversions
The table below shows the UTC offsets and typical hour differences for the most frequently searched conversion pairs. Offsets shift by one hour during daylight saving time (DST) in countries that observe it:
| Conversion | From (UTC) | To (UTC) | Difference |
|---|---|---|---|
| PKT to EST | +05:00 | −05:00 | PKT is 10h ahead |
| EST to PKT | −05:00 | +05:00 | EST is 10h behind |
| IST to PST | +05:30 | −08:00 | IST is 13.5h ahead |
| PST to IST | −08:00 | +05:30 | PST is 13.5h behind |
| CST to IST | −06:00 | +05:30 | CST is 11.5h behind |
| GMT to PKT | +00:00 | +05:00 | GMT is 5h behind |
| GMT to IST | +00:00 | +05:30 | GMT is 5.5h behind |
| EST to JST | −05:00 | +09:00 | EST is 14h behind |
| PST to JST | −08:00 | +09:00 | PST is 17h behind |
| EST to AEST | −05:00 | +10:00 | EST is 15h behind |
| EST to CET | −05:00 | +01:00 | EST is 6h behind |
| EST to BST | −05:00 | +01:00 (summer) | EST is 5–6h behind |
| CST to PST | −06:00 | −08:00 | CST is 2h ahead |
| UTC to IST | +00:00 | +05:30 | UTC is 5.5h behind |
These offsets shift during DST transitions. This converter handles DST automatically — enter the exact date and the tool applies the correct offset for that specific day.
How to Use the Converter
- Step 1: Select your source city using the "Convert from" dropdown — search by city name, country, or timezone abbreviation.
- Step 2: Enter the date and time you want to convert, or leave it to see the current live time.
- Step 3: Add destination cities using the search box or the quick-add buttons (London, Dubai, Mumbai, Singapore, Tokyo, Sydney).
- Step 4: Toggle between 12-hour and 24-hour format using the button at the top right.
- Step 5: Sun and moon icons indicate whether the converted time falls during daytime or nighttime hours — useful for finding the best time to call between two countries.
Multiple Time Zone Clock Online
The World Clock tab shows live ticking times for all your added cities simultaneously. Each card features an analog clock face that changes color palette by time of day (morning gold, afternoon blue, evening orange, night indigo), a digital time display with seconds, the current date, UTC offset, and a 24-hour day progress bar. Filter by region (Americas, Europe, Asia, Africa, Pacific) to focus on the zones that matter to you. You can see the current time in all time zones at a glance.
How Do Time Zones Work?
The Earth rotates 360 degrees in 24 hours, so it is divided into zones roughly 15 degrees of longitude apart — each offset by one hour from its neighbor. All zones are expressed as offsets from Coordinated Universal Time (UTC, the modern successor to GMT). Moving east from the Prime Meridian adds hours (UTC+1, +2, etc.); moving west subtracts them (UTC−1, −2, etc.).
In practice, time zone boundaries follow national and regional borders rather than strict longitude lines, which is why the world has over 38 distinct offsets rather than a clean 24. Several countries use half-hour offsets (India at UTC+05:30, Iran at UTC+03:30) or even quarter-hour offsets (Nepal at UTC+05:45). Many countries also observe daylight saving time (DST), shifting clocks forward by one hour during summer months. This converter uses the IANA timezone database to handle all of these edge cases automatically.
When Is It Tomorrow in Another Country?
If you are in New York (EST, UTC−05:00) at 8 PM, it is already tomorrow in Tokyo (JST, UTC+09:00) — specifically 10 AM the next day. The date line effectively runs through the Pacific Ocean, so locations far east of you can be a full calendar day ahead. The converter shows the full date alongside the time for each destination, so you can immediately see when it is "tomorrow" in any city relative to your source time.
Finding the Best Time to Call Between Two Countries
Add both cities to the converter and look for times that fall between 9 AM and 6 PM in both locations. The day/night icons on each converted time make this easy — if both show the sun icon, both parties are in daytime hours. For challenging pairs like EST to JST (14 hours apart), the overlap window is narrow — typically early morning in the US and evening in Japan. If you are calculating durations for those calls, our time calculator handles hours, minutes, and seconds arithmetic. And to count the days until an important meeting or deadline across time zones, our days between calculator can help.
Understanding UTC Offsets and DST
All time zones are expressed as an offset from UTC. For example, New York is UTC−05:00 in winter (EST) and UTC−04:00 in summer (EDT). This tool uses the browser's Intl API with full IANA timezone data, so DST transitions are handled automatically based on the exact date you enter — you never need to manually account for daylight saving shifts.
12-Hour vs 24-Hour Time Format
The 12-hour format uses AM and PM notation (e.g. 3:00 PM), while the 24-hour format runs from 00:00 to 23:59 (e.g. 15:00). Most of the world uses 24-hour format in official contexts — military, aviation, medicine, and most countries outside the US. Use the toggle at the top of this tool to switch between them. This effectively makes the tool a 12 hour to 24 hour converter alongside its timezone functionality.
Frequently Asked Questions
Does this tool account for daylight saving time?
How do I convert PKT to EST?
How do I convert IST to PST?
What is the difference between 12-hour and 24-hour format?
How many time zones are there in the world?
How do time zones work?
What time zone am I in right now?
Can I use this to find the best time to call between two countries?
Is this time zone converter free?
Final Thoughts
Whether you are scheduling a call from Karachi to New York, coordinating a remote team across London, Dubai, and Tokyo, or just checking what time it is on the other side of the world, this tool gives you instant, DST-aware conversions for 80+ cities with a live world clock.
For related tools, our time calculator handles duration arithmetic, our days between calculator counts days between any two dates, and our currency converter handles the financial side of international coordination.