COT to Tehran
+8h 30mCOT
COTSOURCETehran
IRSTGreen 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 – Colombia Time
UTC-05:00Colombia Time (COT) is the standard time for Colombia, 5 hours behind UTC.
- •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.
IRST – Iran Standard Time
UTC+03:30Iran Standard Time (IRST) is the time zone for Iran, 3 hours and 30 minutes ahead of UTC.
- •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.
About Tehran
WikipediaTehran operates on Iran Standard Time (IRST), UTC+3:30. Iran's unique half-hour offset makes Tehran time distinctive for regional business coordination.
Iran Standard Time (IRST) is one of few timezones with a 30-minute offset (UTC+3:30).
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:
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.
What are the business hours in Tehran?
Standard business hours in Tehran are 8:00 AM - 4:00 PM IRST.
Which countries use COT (Colombia Time)?
COT is used in Colombia.
Does COT observe daylight saving time?
No, COT does not observe daylight saving time and remains at UTC-05:00 year-round.
What are some interesting facts about COT?
Colombia does not observe daylight saving time. COT is the same offset as EST (UTC-05:00).
Which cities are in the IRST timezone?
Major cities in the IRST timezone include Tehran, Isfahan, Mashhad, Tabriz, Shiraz, Karaj.
What is the UTC offset for IRST?
Iran Standard Time (IRST) is at UTC+03:30. During daylight saving time, it shifts to IRDT.
What should I know about the IRST timezone?
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).
When is it midnight in COT, what time is it in Tehran?
When it is 12:00 AM (midnight) in COT (COT), it is +8h 30m later in Tehran (IRST).
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