Does it account for Daylight Saving Time?

Yes, our converter uses the IANA timezone database, which includes all current DST rules for every timezone in the world.

UTC (Coordinated Universal Time) is the primary time standard by which the world regulates clocks. All timezones are defined as offsets from UTC.

Can I compare multiple timezones at once?

Yes, you can add multiple cities or timezones and see the equivalent times side by side.

How many timezones are there in the world?

There are 38 distinct UTC offsets in use, ranging from UTC-12 to UTC+14. This includes half-hour (UTC+5:30 India, UTC+9:30 Australia) and 45-minute offsets (UTC+5:45 Nepal, UTC+8:45 Australia).

What is the International Date Line?

The International Date Line (IDL) runs roughly along the 180° meridian in the Pacific Ocean. When you cross it westward, you gain a day; crossing eastward, you lose a day.

Why do some timezones have 30 or 45 minute offsets?

Countries chose offsets that best matched their solar noon. India uses UTC+5:30 and Nepal uses UTC+5:45 because standard hourly offsets didn't align well with their geography.

Which country has the most timezones?

France has the most (12 timezones) due to overseas territories. Russia spans 11 timezones. The US has 6 (including Hawaii and Alaska).

United Kingdom to Karachi

+4h

United Kingdom

BSTSOURCE

UTC+01:00☀ DST active

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Karachi

PKT

Pakistan · UTC+05:00

HH04

MM00

16:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

United Kingdom

Karachi

12:00 AM

4:00 AM

2:00 AM

6:00 AM

4:00 AM

8:00 AM

6:00 AM

10:00 AM

8:00 AM

12:00 PM

10:00 AM

2:00 PM

12:00 PM

4:00 PM

2:00 PM

6:00 PM

4:00 PM

8:00 PM

6:00 PM

10:00 PM

8:00 PM

12:00 AM+1

10:00 PM

2:00 AM+1

Green rows indicate typical business hours (9 AM - 5 PM)

BST and PKT on the World Map

The map below highlights the BST (Greenwich Mean Time) and PKT (Pakistan Standard Time) timezone regions across the globe.

BST Zone

→

PKT Zone

Explore all world timezones interactively →

GMT – Greenwich Mean Time

UTC+00:00

Greenwich Mean Time (GMT) is the mean solar time at the Royal Observatory in Greenwich, London. It is the same as UTC+00:00.

Countries in GMT

United KingdomIrelandIcelandPortugal (mainland)GhanaSenegalMaliMauritaniaGambiaGuineaSierra LeoneLiberiaIvory CoastBurkina FasoMorocco (historically)

Major Cities in GMT

LondonDublinLisbonAccraReykjavikEdinburghCasablancaDakarBamakoAbidjanConakryFreetownMonrovia

Key Facts about GMT

•GMT is based on the Prime Meridian (0° longitude) passing through Greenwich, London.
•The Royal Observatory in Greenwich has been the reference point for GMT since 1884.
•GMT and UTC are often used interchangeably, but UTC is based on atomic clocks.
•Iceland uses GMT year-round and never observes daylight saving time.
•The UK switches from GMT to BST (British Summer Time) in late March each year.

Daylight Saving:Yes – switches to BST

Learn more about GMT on Wikipedia

PKT – Pakistan Standard Time

UTC+05:00

Pakistan Standard Time (PKT) is the time zone for Pakistan, 5 hours ahead of UTC.

Countries in PKT

Pakistan

Major Cities in PKT

KarachiLahoreIslamabadRawalpindiFaisalabadPeshawar

Key Facts about PKT

•Pakistan does not observe daylight saving time.
•Karachi is one of the world's most populous cities.
•PKT is the same offset as Uzbekistan (UZT) and Yekaterinburg (YEKT).

Daylight Saving:No – UTC+05:00 year-round

Learn more about PKT on Wikipedia

About Karachi

Wikipedia

Karachi operates on Pakistan Standard Time (PKT), UTC+5. As Pakistan's financial hub and largest port city, Karachi time drives South Asian commerce.

Population:14.9 million

Metro:16.5 million

Business Hours:9:00 AM - 5:00 PM PKT

Currency:PKR (₨)

Stock Exchange:PSX (Pakistan Stock Exchange)

Key Landmarks

Quaid-e-Azam's MausoleumMohatta PalaceClifton BeachPort GrandPAF Museum

Did You Know?

Karachi is one of the fastest-growing megacities in the world.

Learn more about PKT timezone →

United Kingdom to Karachi Time Difference – Complete Guide

United Kingdom runs on British Summer Time (BST) at UTC+01:00, currently observing daylight saving time. Karachi runs on Pakistan Standard Time (PKT) at UTC+05:00. That puts United Kingdom 4 hours ahead of Karachi — a difference of +4h at the current offsets.

In practice, when it is 9:00 AM in United Kingdom it is 1:00 PM in Karachi. Midnight in United Kingdom is 4:00 AM in Karachi.United Kingdom observes daylight saving time while Karachi does not, so the gap narrows or widens by an hour part of the year.

United Kingdom to Karachi time conversion table

United Kingdom (BST)	Karachi (PKT)	Day
12:00 AM	4:00 AM	same day
6:00 AM	10:00 AM	same day
7:00 AM	11:00 AM	same day
8:00 AM	12:00 PM	same day
9:00 AM	1:00 PM	same day
12:00 PM	4:00 PM	same day
3:00 PM	7:00 PM	same day
5:00 PM	9:00 PM	same day
6:00 PM	10:00 PM	same day
9:00 PM	1:00 AM	next day

Why people convert United Kingdom to Karachi time

Scheduling a call from United Kingdom to Karachi: a 10:00 AM start in United Kingdom lands at 2:00 PM in Karachi, so you can confirm the slot without doing the arithmetic yourself.
Finding shared working hours: both United Kingdom and Karachi are inside the 9-to-5 working day between 9:00 AM and 1:00 PM BST time (1:00 PM–5:00 PM PKT). That is roughly 4 hours of usable overlap.
Coordinating a United Kingdom-based team with Karachi contacts: quoting times in the other side's local clock — not your own — removes the single biggest source of missed meetings.

Always state the zone abbreviation, not just the hour. "3:00 PM BST" is unambiguous; "3 PM" across a +4h gap is not.
Block 9:00 AM–1:00 PM BST as the recurring meeting window if you work primarily from United Kingdom and need Karachi colleagues present.
United Kingdom: Clocks fall back on Sun, Oct 25, 2026. Re-check this page after that date because the offset changes and so does the +4h gap.

About GMT (Greenwich Mean Time)

Greenwich Mean Time (GMT) is the clock time at the Royal Observatory in Greenwich, London, which sits on the Prime Meridian (0° longitude). GMT serves as the reference point from which all other time zones are calculated. The United Kingdom uses GMT during winter months and switches to British Summer Time (BST, UTC+01:00) from late March to late October. Several West African nations use GMT year-round. GMT is often used interchangeably with UTC (Coordinated Universal Time), although technically they are different – UTC is based on atomic clocks while GMT is based on Earth's rotation.

About PKT (Pakistan Standard Time)

Pakistan Standard Time (PKT) is the time zone used throughout Pakistan. PKT does not observe daylight saving time. Pakistan is the 5th most populous country in the world.

Best time to call between United Kingdom and Karachi

Both United Kingdom and Karachi sit inside the 9 AM – 5 PM working day between 9:00 AM–1:00 PM BST, which is 1:00 PM–5:00 PM PKT. That gives roughly 4 hours of shared time — the safest window for a live call or meeting.

Business hours overlap

United Kingdom and Karachi overlap for about 4 hours during the working day — enough for meetings if you avoid the edges of the window.

United Kingdom is 4 hours ahead of Karachi (BST UTC+01:00 → PKT UTC+05:00). The shared working window is 9:00 AM–1:00 PM BST. Remember to re-check around daylight-saving transitions.

🕐 Daylight Saving Time Info

United Kingdom

☀ Currently in DST

Standard: UTC+00:00 · DST: UTC+01:00

Clocks fall back on Sun, Oct 25, 2026

Karachi

Does not observe DST

Learn More About Time

Dive deeper into the fascinating world of timekeeping, time zones, and how they shape our global society:

⏳

History of Timekeeping

From sundials to atomic clocks - 5000 years of measuring time

🌍

How Time Zones Work

UTC, offsets, and why zones don't follow straight lines

☀️

Daylight Saving Time

DST dates, which countries observe it, and the ongoing debate

Frequently Asked Questions

What is the time difference between United Kingdom and Karachi?

United Kingdom (BST, UTC+01:00) is 4 hours ahead of Karachi (PKT, UTC+05:00). The gap is currently +4h.

How do I convert United Kingdom time to Karachi time?

Add +4h to United Kingdom local time. For example, 9:00 AM in United Kingdom is 1:00 PM in Karachi.

What time is it in Karachi right now?

Karachi uses PKT at UTC+05:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +4h offset from United Kingdom.

What is the best time to call Karachi from United Kingdom?

Call between 9:00 AM and 1:00 PM BST — that maps to 1:00 PM–5:00 PM PKT and keeps both parties inside the working day.

Which is ahead, United Kingdom or Karachi?

United Kingdom is 4 hours ahead of Karachi. When it is 12:00 PM in United Kingdom it is 4:00 PM in Karachi.

Do United Kingdom and Karachi use different time zones?

United Kingdom (United Kingdom) uses BST at UTC+01:00, while Karachi (Pakistan) uses PKT at UTC+05:00. The IANA identifiers are Europe/London and Asia/Karachi.

Does daylight saving time affect the United Kingdom–Karachi difference?

Yes at the moment: United Kingdom is on daylight saving time and Karachi is not, so the +4h gap shifts by an hour when exactly one of them changes clocks.

Which other cities share United Kingdom's time zone?

BST also covers London, Dublin, Lisbon, Accra, Reykjavik, Edinburgh, Casablanca, Dakar and 5 more.

Which countries use BST, United Kingdom's zone?

BST is used in United Kingdom, Ireland, Iceland, Portugal (mainland), Ghana, Senegal, Mali, Mauritania and 7 more.

Is there a day difference between United Kingdom and Karachi?

Not normally. The +4h gap only pushes the date over for late-evening times.

What is the time difference between United Kingdom and Karachi?

Karachi is +4h from United Kingdom.

What timezone is United Kingdom in?

United Kingdom operates on its local timezone.

What timezone is Karachi in?

Karachi operates on Pakistan Standard Time (PKT), UTC+5. As Pakistan's financial hub and largest port city, Karachi time drives South Asian commerce.

What are the business hours in Karachi?

Standard business hours in Karachi are 9:00 AM - 5:00 PM PKT.

Which countries use GMT (Greenwich Mean Time)?

GMT is used in United Kingdom, Ireland, Iceland, Portugal (mainland), Ghana, Senegal, and 9 more countries.

Does GMT observe daylight saving time?

Yes, GMT switches to BST during summer months.

What are some interesting facts about GMT?

GMT is based on the Prime Meridian (0° longitude) passing through Greenwich, London. The Royal Observatory in Greenwich has been the reference point for GMT since 1884.