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).

TRT to COT

-8h

TRT

TRTSOURCE

UTC+03:00

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

COT

UTC-05:00

HH04

MM00

04:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

TRT

COT

12:00 AM

4:00 PM-1

2:00 AM

6:00 PM-1

4:00 AM

8:00 PM-1

6:00 AM

10:00 PM-1

8:00 AM

12:00 AM

10:00 AM

2:00 AM

12:00 PM

4:00 AM

2:00 PM

6:00 AM

4:00 PM

8:00 AM

6:00 PM

10:00 AM

8:00 PM

12:00 PM

10:00 PM

2:00 PM

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

TRT and COT on the World Map

The map below highlights the TRT (Turkey Time) and COT (Colombia Time) timezone regions across the globe.

TRT Zone

→

COT Zone

Explore all world timezones interactively →

TRT – Turkey Time

UTC+03:00

Turkey Time (TRT, UTC+03:00) is the single time zone used across Turkey, fixed year round since 2016.

Countries in TRT

Turkey

Major Cities in TRT

IstanbulAnkaraIzmirBursaAntalya

Key Facts about TRT

•Turkey has used a permanent UTC+03:00 since September 2016.
•TRT is level with Moscow Standard Time and Arabia Standard Time all year.
•Because Turkey kept summer time permanently, western cities see very late winter sunrises.
•Turkey previously observed daylight saving time from 1973 to 2016.

Daylight Saving:No – UTC+03:00 year-round

Learn more about TRT on Wikipedia

COT – Colombia Time

UTC-05:00

Colombia Time (COT) is the standard time for Colombia, 5 hours behind UTC.

Countries in COT

Colombia

Major Cities in COT

BogotáMedellínCaliBarranquillaCartagena

Key Facts about COT

•Colombia does not observe daylight saving time.
•COT is the same offset as EST (UTC-05:00).
•Bogotá sits at 2,640m elevation, making it one of the highest capital cities.

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

Learn more about COT on Wikipedia

Time Conversion Guide: TRT to COT

TRT runs on Turkey Time (TRT) at UTC+03:00. COT runs on Colombia Time (COT) at UTC-05:00. That puts TRT 8 hours behind COT — a difference of -8h at the current offsets.

In practice, when it is 9:00 AM in TRT it is 1:00 AM in COT. Midnight in TRT is 4:00 PM in COT. Neither zone observes daylight saving time, so the offset between them stays constant all year.

TRT to COT time conversion table

TRT (TRT)	COT (COT)	Day
12:00 AM	4:00 PM	previous day
6:00 AM	10:00 PM	previous day
7:00 AM	11:00 PM	previous day
8:00 AM	12:00 AM	same day
9:00 AM	1:00 AM	same day
12:00 PM	4:00 AM	same day
3:00 PM	7:00 AM	same day
5:00 PM	9:00 AM	same day
6:00 PM	10:00 AM	same day
9:00 PM	1:00 PM	same day

Why people convert TRT to COT time

Scheduling a call from TRT to COT: a 10:00 AM start in TRT lands at 2:00 AM in COT, so you can confirm the slot without doing the arithmetic yourself.
Handling a -8h gap: TRT and COT 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 COT is 1:00 AM in TRT.
Coordinating a TRT-based team with COT 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 TRT" is unambiguous; "3 PM" across a -8h gap is not.
With a -8h gap there is no shared 9-to-5 window, so alternate the early start: one week TRT takes the early slot, the next week COT does.

About TRT (Turkey Time)

Turkey Time (TRT) is fixed at UTC+03:00 all year. Turkey abolished seasonal clock changes in September 2016, moving to a permanent UTC+03:00 so the whole country stays on what was formerly summer time. That leaves Istanbul, which sits close to 29°E, on an offset well ahead of its solar time — sunrise in mid-winter comes after 08:30 local. TRT shares its offset with Moscow Standard Time, Arabia Standard Time and East Africa Time, so Istanbul is level with Moscow and Riyadh all year and one hour ahead of Central European Time during the European winter.

About COT (Colombia Time)

Colombia Time (COT) is used throughout Colombia. Colombia does not observe daylight saving time. COT shares the same offset as EST (UTC-05:00). Bogotá, the capital, is one of the largest cities in South America.

Best time to call between TRT and COT

With a -8h offset there is no overlap inside a normal 9 AM – 5 PM day. COT opens at 9:00 AM COT, which is 1:00 AM in TRT, so real-time calls need an early-morning or late-evening slot on one side.

Business hours overlap

TRT and COT have no shared working hours because of the -8h gap. Teams need to alternate early starts or rely on asynchronous handovers.

TRT is 8 hours behind COT (TRT UTC+03:00 → COT UTC-05:00). There is no shared 9-to-5 window, so plan around an early or late slot. Remember to re-check around daylight-saving transitions.