IST to COT
-10h 30mIST
ISTSOURCECOT
COTGreen rows indicate typical business hours (9 AM - 5 PM)
IST and COT on the World Map
The map below highlights the IST (India Standard Time) and COT (Colombia Time) timezone regions across the globe.
IST – India Standard Time
UTC+05:30India Standard Time (IST) is the time zone for India and Sri Lanka, 5 hours and 30 minutes ahead of UTC.
- •India is 10 hours 30 minutes ahead of EST and 5 hours 30 minutes ahead of GMT.
- •India uses a single time zone despite spanning 30° of longitude.
- •IST is one of only a handful of time zones with a 30-minute offset.
- •IST is the most populous single time zone in the world with over 1.4 billion people.
- •The Bombay Stock Exchange (BSE) and National Stock Exchange (NSE) operate on IST.
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.
Understanding the -10h 30m Gap: IST vs COT
IST runs on India Standard Time (IST) at UTC+05:30. COT runs on Colombia Time (COT) at UTC-05:00. That puts IST 10 hours 30 minutes behind COT — a difference of -10h 30m at the current offsets.
In practice, when it is 9:00 AM in IST it is 10:30 PM in COT on the previous day. Midnight in IST is 1:30 PM in COT. Neither zone observes daylight saving time, so the offset between them stays constant all year.
IST to COT time conversion table
| IST (IST) | COT (COT) | Day |
|---|---|---|
| 12:00 AM | 1:30 PM | previous day |
| 6:00 AM | 7:30 PM | previous day |
| 7:00 AM | 8:30 PM | previous day |
| 8:00 AM | 9:30 PM | previous day |
| 9:00 AM | 10:30 PM | previous day |
| 12:00 PM | 1:30 AM | same day |
| 3:00 PM | 4:30 AM | same day |
| 5:00 PM | 6:30 AM | same day |
| 6:00 PM | 7:30 AM | same day |
| 9:00 PM | 10:30 AM | same day |
Why people convert IST to COT time
- Scheduling a call from IST to COT: a 10:00 AM start in IST lands at 11:30 PM in COT the previous day, so you can confirm the slot without doing the arithmetic yourself.
- Handling a -10h 30m gap: IST 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 10:30 PM in IST.
- Keeping family and friends in sync: knowing that 8:00 PM in IST is 9:30 AM in COT makes it easy to avoid calling at 3 AM.
- Always state the zone abbreviation, not just the hour. "3:00 PM IST" is unambiguous; "3 PM" across a -10h 30m gap is not.
- With a -10h 30m gap there is no shared 9-to-5 window, so alternate the early start: one week IST takes the early slot, the next week COT does.
About IST (India Standard Time)
India Standard Time (IST) is the time observed throughout India and Sri Lanka. It is based on the 82.5°E meridian, passing through Mirzapur in Uttar Pradesh. India uses a single time zone despite spanning roughly 30° of longitude, which has been debated. IST does not observe daylight saving time. India is the world's most populous country, making IST one of the most-used time zones globally. The IT outsourcing industry and call centers operate primarily on IST, making the EST-to-IST conversion one of the most searched timezone conversions.
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 IST and COT
With a -10h 30m offset there is no overlap inside a normal 9 AM – 5 PM day. COT opens at 9:00 AM COT, which is 10:30 PM in IST, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
IST and COT have no shared working hours because of the -10h 30m gap. Teams need to alternate early starts or rely on asynchronous handovers.
IST is 10 hours 30 minutes behind COT (IST UTC+05:30 → 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.
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 IST and COT?
IST (IST, UTC+05:30) is 10 hours 30 minutes behind COT (COT, UTC-05:00). The gap is currently -10h 30m.
How do I convert IST time to COT time?
Add -10h 30m to IST local time. For example, 9:00 AM in IST is 10:30 PM in COT (previous day).
What time is it in COT right now?
COT uses COT at UTC-05:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -10h 30m offset from IST.
What is the best time to call COT from IST?
There is no shared working-hours window because of the -10h 30m gap. The closest option is 1:00 PM in IST, which is 2:30 AM in COT.
Which is behind, IST or COT?
IST is 10 hours 30 minutes behind COT. When it is 12:00 PM in IST it is 1:30 AM in COT.
Does daylight saving time affect the IST–COT difference?
Neither zone observes daylight saving time, so the -10h 30m offset between IST and COT is fixed all year.
Which other cities share IST's time zone?
IST also covers Mumbai, Delhi, Bangalore, Kolkata, Chennai, Hyderabad, Pune, Ahmedabad and 4 more.
Which countries use IST, IST's zone?
IST is used in India, Sri Lanka.
Is there a day difference between IST and COT?
Not normally. The -10h 30m gap only pushes the date over the previous day.
What is the time difference between IST and COT?
COT is -10h 30m from IST.
What timezone is IST in?
IST operates on its local timezone.
What timezone is COT in?
COT operates on its local timezone.
Which countries use IST (India Standard Time)?
IST is used in India, Sri Lanka.
Does IST observe daylight saving time?
No, IST does not observe daylight saving time and remains at UTC+05:30 year-round.
What are some interesting facts about IST?
India is 10 hours 30 minutes ahead of EST and 5 hours 30 minutes ahead of GMT. India uses a single time zone despite spanning 30° of longitude.
Which cities are in the COT timezone?
Major cities in the COT timezone include Bogotá, Medellín, Cali, Barranquilla, Cartagena.
What is the UTC offset for COT?
Colombia Time (COT) is at UTC-05:00.
What should I know about the COT timezone?
Colombia does not observe daylight saving time. COT is the same offset as EST (UTC-05:00).
When is it midnight in IST, what time is it in COT?
When it is 12:00 AM (midnight) in IST (IST), it is -10h 30m later in COT (COT).
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