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 MDT

-10h

GST

GSTSOURCE

UTC+04:00

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

MDT

UTC-06:00☀ DST active

HH02

MM00

02:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

GST

MDT

12:00 AM

2:00 PM-1

2:00 AM

4:00 PM-1

4:00 AM

6:00 PM-1

6:00 AM

8:00 PM-1

8:00 AM

10:00 PM-1

10:00 AM

12:00 AM

12:00 PM

2:00 AM

2:00 PM

4:00 AM

4:00 PM

6:00 AM

6:00 PM

8:00 AM

8:00 PM

10:00 AM

10:00 PM

12:00 PM

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

GST and MDT on the World Map

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

GST Zone

→

MDT 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

MDT – Mountain Daylight Time

UTC-06:00

Mountain Daylight Time (MDT) is the daylight saving offset in the Mountain Time Zone, 6 hours behind UTC.

Countries in MDT

United States (Mountain)Canada (Alberta)

Major Cities in MDT

DenverCalgaryEdmontonSalt Lake CityBoise

Key Facts about MDT

•MDT shares the same offset as CST (UTC-06:00).
•Arizona does not switch to MDT, remaining on MST.

Daylight Saving:Yes – switches to MST

Learn more about MDT on Wikipedia

GST to MDT Time Difference – Complete Guide

GST runs on Gulf Standard Time (GST) at UTC+04:00. MDT runs on Mountain Daylight Time (MDT) at UTC-06:00. That puts GST 10 hours behind MDT — a difference of -10h at the current offsets.

In practice, when it is 9:00 AM in GST it is 11:00 PM in MDT on the previous day. Midnight in GST is 2:00 PM in MDT. Neither zone observes daylight saving time, so the offset between them stays constant all year.

GST to MDT time conversion table

GST (GST)	MDT (MDT)	Day
12:00 AM	2:00 PM	previous day
6:00 AM	8:00 PM	previous day
7:00 AM	9:00 PM	previous day
8:00 AM	10:00 PM	previous day
9:00 AM	11:00 PM	previous day
12:00 PM	2:00 AM	same day
3:00 PM	5:00 AM	same day
5:00 PM	7:00 AM	same day
6:00 PM	8:00 AM	same day
9:00 PM	11:00 AM	same day

Why people convert GST to MDT time

Scheduling a call from GST to MDT: a 10:00 AM start in GST lands at 12:00 AM in MDT, so you can confirm the slot without doing the arithmetic yourself.
Handling a -10h gap: GST and MDT 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 MDT is 11:00 PM in GST.
Keeping family and friends in sync: knowing that 8:00 PM in GST is 10:00 AM in MDT makes it easy to avoid calling at 3 AM.

Always state the zone abbreviation, not just the hour. "3:00 PM GST" is unambiguous; "3 PM" across a -10h gap is not.
With a -10h gap there is no shared 9-to-5 window, so alternate the early start: one week GST takes the early slot, the next week MDT 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 MDT (Mountain Daylight Time)

Mountain Daylight Time (MDT) is observed during summer months in the Mountain Time Zone, except in Arizona which stays on MST year-round. MDT aligns with Central Standard Time (CST) at UTC-06:00.

Best time to call between GST and MDT

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

Business hours overlap

GST and MDT have no shared working hours because of the -10h gap. Teams need to alternate early starts or rely on asynchronous handovers.

GST is 10 hours behind MDT (GST UTC+04:00 → MDT UTC-06:00). 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

MDT

☀ Currently in DST

Standard: UTC-07:00 · DST: UTC-06:00

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 MDT?

GST (GST, UTC+04:00) is 10 hours behind MDT (MDT, UTC-06:00). The gap is currently -10h.

How do I convert GST time to MDT time?

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

What time is it in MDT right now?

MDT uses MDT at UTC-06:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -10h offset from GST.