Does it handle Daylight Saving Time?

Yes, the tool automatically adjusts for Daylight Saving Time based on the specific date you select, ensuring accurate conversions year-round.

Can I add multiple cities?

Yes, you can add as many cities as you need to the dashboard to compare times across your entire global network simultaneously.

Colombia to IRST

+8h 30m

Colombia

COTSOURCE

UTC-05:00

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

IRST

UTC+03:30

HH08

MM30

20:30 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

Colombia

IRST

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

Understanding the +8h 30m Gap: Colombia vs IRST

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

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

Colombia to IRST time conversion table

Colombia (COT)	IRST (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 Colombia to IRST time

Scheduling a call from Colombia to IRST: a 10:00 AM start in Colombia lands at 6:30 PM in IRST, so you can confirm the slot without doing the arithmetic yourself.
Handling a +8h 30m gap: Colombia and IRST 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 IRST is 5:30 PM in Colombia.
Keeping family and friends in sync: knowing that 8:00 PM in Colombia is 4:30 AM in IRST 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 Colombia takes the early slot, the next week IRST 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 Colombia and IRST

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

Business hours overlap

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

Colombia is 8 hours 30 minutes ahead of IRST (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 Colombia and IRST?

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

How do I convert Colombia time to IRST time?

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

What time is it in IRST right now?

IRST 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 Colombia.