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).

GST to PDT

-11h

GST

GSTSOURCE

UTC+04:00

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

PDT

UTC-07:00☀ DST active

HH01

MM00

01:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

GST

PDT

12:00 AM

1:00 PM-1

2:00 AM

3:00 PM-1

4:00 AM

5:00 PM-1

6:00 AM

7:00 PM-1

8:00 AM

9:00 PM-1

10:00 AM

11:00 PM-1

12:00 PM

1:00 AM

2:00 PM

3:00 AM

4:00 PM

5:00 AM

6:00 PM

7:00 AM

8:00 PM

9:00 AM

10:00 PM

11:00 AM

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

GST and PDT on the World Map

The map below highlights the GST (Gulf Standard Time) and PDT (Pacific Daylight Time) timezone regions across the globe.

GST Zone

→

PDT Zone

Explore all world timezones interactively →

GST – Gulf Standard Time

UTC+04:00

Gulf Standard Time (GST) is used in the UAE, Oman, and other Gulf states, 4 hours ahead of UTC.

Countries in GST

UAEOmanGeorgiaAzerbaijanMauritius

Major Cities in GST

DubaiAbu DhabiMuscatBakuTbilisi

Key Facts about GST

•Dubai uses GST year-round with no daylight saving time.
•GST is 9 hours ahead of EST and 4 hours ahead of GMT.
•The Dubai Financial Market (DFM) operates on GST.

Daylight Saving:No – UTC+04:00 year-round

Learn more about GST on Wikipedia

PDT – Pacific Daylight Time

UTC-07:00

Pacific Daylight Time (PDT) is the daylight saving offset on the US/Canada Pacific coast, 7 hours behind UTC.

Countries in PDT

United States (Pacific)Canada (British Columbia)Mexico (Baja California)

Major Cities in PDT

Los AngelesSan FranciscoSeattleVancouverPortland

Key Facts about PDT

•PDT aligns with MST at UTC-07:00.
•Tech company earnings calls often reference PDT/PST times.

Daylight Saving:Yes – switches to PST

Learn more about PDT on Wikipedia

Understanding the -11h Gap: GST vs PDT

GST runs on Gulf Standard Time (GST) at UTC+04:00. PDT runs on Pacific Daylight Time (PDT) at UTC-07:00. That puts GST 11 hours behind PDT — a difference of -11h at the current offsets.

In practice, when it is 9:00 AM in GST it is 10:00 PM in PDT on the previous day. Midnight in GST is 1:00 PM in PDT. Neither zone observes daylight saving time, so the offset between them stays constant all year.

GST to PDT time conversion table

GST (GST)	PDT (PDT)	Day
12:00 AM	1:00 PM	previous day
6:00 AM	7:00 PM	previous day
7:00 AM	8:00 PM	previous day
8:00 AM	9:00 PM	previous day
9:00 AM	10:00 PM	previous day
12:00 PM	1:00 AM	same day
3:00 PM	4:00 AM	same day
5:00 PM	6:00 AM	same day
6:00 PM	7:00 AM	same day
9:00 PM	10:00 AM	same day

Why people convert GST to PDT time

Scheduling a call from GST to PDT: a 10:00 AM start in GST lands at 11:00 PM in PDT the previous day, so you can confirm the slot without doing the arithmetic yourself.
Handling a -11h gap: GST and PDT have no overlap inside a normal 9-to-5 day, so real-time meetings need an early-morning or late-evening slot on one side. 9:00 AM in PDT is 10:00 PM in GST.
Watching a live event or market open: GST viewers need 10:00 PM in PDT to catch a 9:00 AM start there, and 11:00 AM if the event is anchored to GST.

Always state the zone abbreviation, not just the hour. "3:00 PM GST" is unambiguous; "3 PM" across a -11h gap is not.
With a -11h gap there is no shared 9-to-5 window, so alternate the early start: one week GST takes the early slot, the next week PDT does.

About GST (Gulf Standard Time)

Gulf Standard Time (GST) is the time zone used in the United Arab Emirates, Oman, and other Gulf states. GST does not observe daylight saving time. Dubai and Abu Dhabi, major international business and tourism hubs, operate on GST.

About PDT (Pacific Daylight Time)

Pacific Daylight Time (PDT) is observed from March to November on the Pacific coast. During PDT, the west coast is 7 hours behind UTC and only 2 hours behind the east coast's EDT.

Best time to call between GST and PDT

With a -11h offset there is no overlap inside a normal 9 AM – 5 PM day. PDT opens at 9:00 AM PDT, which is 10:00 PM in GST, so real-time calls need an early-morning or late-evening slot on one side.

Business hours overlap

GST and PDT have no shared working hours because of the -11h gap. Teams need to alternate early starts or rely on asynchronous handovers.

GST is 11 hours behind PDT (GST UTC+04:00 → PDT UTC-07:00). There is no shared 9-to-5 window, so plan around an early or late slot. Remember to re-check around daylight-saving transitions.

🕐 Daylight Saving Time Info

GST

Does not observe DST

PDT

☀ Currently in DST

Standard: UTC-08:00 · DST: UTC-07:00

Clocks fall back on Sun, Nov 1, 2026

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 GST and PDT?

GST (GST, UTC+04:00) is 11 hours behind PDT (PDT, UTC-07:00). The gap is currently -11h.

How do I convert GST time to PDT time?

Add -11h to GST local time. For example, 9:00 AM in GST is 10:00 PM in PDT (previous day).

What time is it in PDT right now?

PDT uses PDT at UTC-07:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -11h offset from GST.