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 HKT

+13h

COT

COTSOURCE

UTC-05:00

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

HKT

UTC+08:00

HH01

MM00

(next day)01:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

COT

HKT

12:00 AM

1:00 PM

2:00 AM

3:00 PM

4:00 AM

5:00 PM

6:00 AM

7:00 PM

8:00 AM

9:00 PM

10:00 AM

11:00 PM

12:00 PM

1:00 AM+1

2:00 PM

3:00 AM+1

4:00 PM

5:00 AM+1

6:00 PM

7:00 AM+1

8:00 PM

9:00 AM+1

10:00 PM

11:00 AM+1

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

COT and HKT on the World Map

The map below highlights the COT (Colombia Time) and HKT (Hong Kong Time) timezone regions across the globe.

COT Zone

→

HKT 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

HKT – Hong Kong Time

UTC+08:00

Hong Kong Time (HKT, UTC+08:00) is the time zone for Hong Kong, 8 hours ahead of UTC.

Countries in HKT

Hong Kong SAR

Major Cities in HKT

Hong KongKowloonTsuen WanSha Tin

Key Facts about HKT

•Hong Kong does not observe daylight saving time and has kept UTC+08:00 since 1979.
•HKT shares its offset with China Standard Time, Singapore Time and Philippine Time.
•The Hong Kong Stock Exchange opens at 09:30 HKT.
•Hong Kong Time does not change with the seasons, so its gap to other zones is fixed.

Daylight Saving:No – UTC+08:00 year-round

Learn more about HKT on Wikipedia

COT to HKT Time Difference – Complete Guide

COT runs on Colombia Time (COT) at UTC-05:00. HKT runs on Hong Kong Time (HKT) at UTC+08:00. That puts COT 13 hours ahead of HKT — a difference of +13h at the current offsets.

In practice, when it is 9:00 AM in COT it is 10:00 PM in HKT. Midnight in COT is 1:00 PM in HKT. Neither zone observes daylight saving time, so the offset between them stays constant all year.

COT to HKT time conversion table

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

Why people convert COT to HKT time

Scheduling a call from COT to HKT: a 10:00 AM start in COT lands at 11:00 PM in HKT, so you can confirm the slot without doing the arithmetic yourself.
Handling a +13h gap: COT and HKT 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 HKT is 10:00 PM in COT.
Booking travel or deliveries: tracking HKT local time against COT keeps pickup windows and arrival estimates honest across the +13h offset.

Always state the zone abbreviation, not just the hour. "3:00 PM COT" is unambiguous; "3 PM" across a +13h gap is not.
With a +13h gap there is no shared 9-to-5 window, so alternate the early start: one week COT takes the early slot, the next week HKT 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 HKT (Hong Kong Time)

Hong Kong Time (HKT) is fixed at UTC+08:00 all year and does not observe daylight saving time. Hong Kong last used summer time in 1979 and has kept a single offset since. HKT shares the UTC+08:00 offset with China Standard Time, Singapore Time, Malaysian Time, Philippine Time and Australian Western Standard Time, but is listed separately because Hong Kong maintains its own timekeeping authority. As a major financial centre, Hong Kong's trading hours set the rhythm for markets across Asia, opening at 09:30 HKT which is 01:30 in London and 20:30 the previous evening in New York.

Best time to call between COT and HKT

With a +13h offset there is no overlap inside a normal 9 AM – 5 PM day. HKT opens at 9:00 AM HKT, which is 10:00 PM in COT, so real-time calls need an early-morning or late-evening slot on one side.

Business hours overlap

COT and HKT have no shared working hours because of the +13h gap. Teams need to alternate early starts or rely on asynchronous handovers.

COT is 13 hours ahead of HKT (COT UTC-05:00 → HKT UTC+08:00). 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:

⏳

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 HKT?

COT (COT, UTC-05:00) is 13 hours ahead of HKT (HKT, UTC+08:00). The gap is currently +13h.

How do I convert COT time to HKT time?

Add +13h to COT local time. For example, 9:00 AM in COT is 10:00 PM in HKT.

What time is it in HKT right now?

HKT uses HKT at UTC+08:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +13h offset from COT.

What is the best time to call HKT from COT?

There is no shared working-hours window because of the +13h gap. The closest option is 1:00 PM in COT, which is 2:00 AM in HKT.

Which is ahead, COT or HKT?

COT is 13 hours ahead of HKT. When it is 12:00 PM in COT it is 1:00 AM in HKT.

Does daylight saving time affect the COT–HKT difference?

Neither zone observes daylight saving time, so the +13h offset between COT and HKT 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 HKT?

Sometimes. The +13h gap is large enough that 8:00 PM or later in COT already falls on the next day in HKT.

What is the time difference between COT and HKT?

HKT is +13h from COT.

What timezone is COT in?

COT operates on its local timezone.

What timezone is HKT in?

HKT operates on its local timezone.

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 HKT timezone?

Major cities in the HKT timezone include Hong Kong, Kowloon, Tsuen Wan, Sha Tin.

What is the UTC offset for HKT?

Hong Kong Time (HKT) is at UTC+08:00.

What should I know about the HKT timezone?

Hong Kong does not observe daylight saving time and has kept UTC+08:00 since 1979. HKT shares its offset with China Standard Time, Singapore Time and Philippine Time.