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).

COT to Tehran

+8h 30m

COT

COTSOURCE

UTC-05:00

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Tehran

IRST

Iran · UTC+03:30

HH08

MM30

20:30 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

COT

Tehran

12:00 AM

8:30 AM

2:00 AM

10:30 AM

4:00 AM

12:30 PM

6:00 AM

2:30 PM

8:00 AM

4:30 PM

10:00 AM

6:30 PM

12:00 PM

8:30 PM

2:00 PM

10:30 PM

4:00 PM

12:30 AM+1

6:00 PM

2:30 AM+1

8:00 PM

4:30 AM+1

10:00 PM

6:30 AM+1

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

COT and IRST on the World Map

The map below highlights the COT (Colombia Time) and IRST (Iran Standard Time) timezone regions across the globe.

COT Zone

→

IRST Zone

Explore all world timezones interactively →

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

IRST – Iran Standard Time

UTC+03:30

Iran Standard Time (IRST) is the time zone for Iran, 3 hours and 30 minutes ahead of UTC.

Countries in IRST

Iran

Major Cities in IRST

TehranIsfahanMashhadTabrizShirazKaraj

Key Facts about IRST

•IRST is one of only a few time zones with a 30-minute offset.
•Iran observes daylight saving time, switching to IRDT (UTC+04:30).
•Tehran has a metropolitan population of over 16 million.

Daylight Saving:Yes – switches to IRDT

Learn more about IRST on Wikipedia

About Tehran

Wikipedia

Tehran operates on Iran Standard Time (IRST), UTC+3:30. Iran's unique half-hour offset makes Tehran time distinctive for regional business coordination.

Population:9.4 million

Metro:16.8 million

Business Hours:8:00 AM - 4:00 PM IRST

Currency:IRR (﷼)

Stock Exchange:TSE (Tehran Stock Exchange)

Key Landmarks

Azadi TowerGolestan PalaceGrand BazaarMilad TowerTabiat Bridge

Did You Know?

Iran Standard Time (IRST) is one of few timezones with a 30-minute offset (UTC+3:30).

Learn more about IRST timezone →

COT vs Tehran: Offsets, DST and Best Call Times

COT runs on Colombia Time (COT) at UTC-05:00. Tehran runs on Iran Standard Time (IRST) at UTC+03:30. That puts COT 8 hours 30 minutes ahead of Tehran — a difference of +8h 30m at the current offsets.

In practice, when it is 9:00 AM in COT it is 5:30 PM in Tehran. Midnight in COT is 8:30 AM in Tehran. Neither zone observes daylight saving time, so the offset between them stays constant all year.

COT to Tehran time conversion table

COT (COT)	Tehran (IRST)	Day
12:00 AM	8:30 AM	same day
6:00 AM	2:30 PM	same day
7:00 AM	3:30 PM	same day
8:00 AM	4:30 PM	same day
9:00 AM	5:30 PM	same day
12:00 PM	8:30 PM	same day
3:00 PM	11:30 PM	same day
5:00 PM	1:30 AM	next day
6:00 PM	2:30 AM	next day
9:00 PM	5:30 AM	next day

Why people convert COT to Tehran time

Scheduling a call from COT to Tehran: a 10:00 AM start in COT lands at 6:30 PM in Tehran, so you can confirm the slot without doing the arithmetic yourself.
Handling a +8h 30m gap: COT and Tehran 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 Tehran is 5:30 PM in COT.
Keeping family and friends in sync: knowing that 8:00 PM in COT is 4:30 AM in Tehran makes it easy to avoid calling at 3 AM.

Always state the zone abbreviation, not just the hour. "3:00 PM COT" is unambiguous; "3 PM" across a +8h 30m gap is not.
With a +8h 30m gap there is no shared 9-to-5 window, so alternate the early start: one week COT takes the early slot, the next week Tehran does.

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.

About IRST (Iran Standard Time)

Iran Standard Time (IRST) is one of the few time zones with a 30-minute offset. Iran observes daylight saving time (IRDT, UTC+04:30) from late March to late September. Tehran, the capital, is one of the largest cities in the Middle East.

Best time to call between COT and Tehran

With a +8h 30m offset there is no overlap inside a normal 9 AM – 5 PM day. Tehran opens at 9:00 AM IRST, which is 5:30 PM in COT, so real-time calls need an early-morning or late-evening slot on one side.

Business hours overlap

COT and Tehran have no shared working hours because of the +8h 30m gap. Teams need to alternate early starts or rely on asynchronous handovers.

COT is 8 hours 30 minutes ahead of Tehran (COT UTC-05:00 → IRST UTC+03:30). There is no shared 9-to-5 window, so plan around an early or late slot. Remember to re-check around daylight-saving transitions.

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 COT and Tehran?

COT (COT, UTC-05:00) is 8 hours 30 minutes ahead of Tehran (IRST, UTC+03:30). The gap is currently +8h 30m.

How do I convert COT time to Tehran time?

Add +8h 30m to COT local time. For example, 9:00 AM in COT is 5:30 PM in Tehran.

What time is it in Tehran right now?

Tehran uses IRST at UTC+03:30. Use the live converter at the top of this page — it updates in real time and already accounts for the +8h 30m offset from COT.

What is the best time to call Tehran from COT?

There is no shared working-hours window because of the +8h 30m gap. The closest option is 1:00 PM in COT, which is 9:30 PM in Tehran.

Which is ahead, COT or Tehran?

COT is 8 hours 30 minutes ahead of Tehran. When it is 12:00 PM in COT it is 8:30 PM in Tehran.

Do COT and Tehran use different time zones?

COT uses COT at UTC-05:00, while Tehran (Iran) uses IRST at UTC+03:30. The IANA identifiers are America/Bogota and Asia/Tehran.

Does daylight saving time affect the COT–Tehran difference?

Neither zone observes daylight saving time, so the +8h 30m offset between COT and Tehran is fixed all year.

Which other cities share COT's time zone?

COT also covers Bogotá, Medellín, Cali, Barranquilla, Cartagena.

Which countries use COT, COT's zone?

COT is used in Colombia.

Is there a day difference between COT and Tehran?

Not normally. The +8h 30m gap only pushes the date over for late-evening times.

What is the time difference between COT and Tehran?

Tehran is +8h 30m from COT.

What timezone is COT in?

COT operates on its local timezone.

What timezone is Tehran in?

Tehran operates on Iran Standard Time (IRST), UTC+3:30. Iran's unique half-hour offset makes Tehran time distinctive for regional business coordination.