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 WIB

+12h

COT

COTSOURCE

UTC-05:00

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

WIB

UTC+07:00

HH12

MM00

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

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

COT

WIB

12:00 AM

12:00 PM

2:00 AM

2:00 PM

4:00 AM

4:00 PM

6:00 AM

6:00 PM

8:00 AM

8:00 PM

10:00 AM

10:00 PM

12:00 PM

12:00 AM+1

2:00 PM

2:00 AM+1

4:00 PM

4:00 AM+1

6:00 PM

6:00 AM+1

8:00 PM

8:00 AM+1

10:00 PM

10:00 AM+1

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

COT and WIB on the World Map

The map below highlights the COT (Colombia Time) and WIB (Western Indonesia Time) timezone regions across the globe.

COT Zone

→

WIB 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

WIB – Western Indonesia Time

UTC+07:00

Western Indonesia Time (WIB, UTC+07:00) covers Java, Sumatra and West Kalimantan, including Jakarta.

Countries in WIB

Indonesia (Java, Sumatra, West Kalimantan)

Major Cities in WIB

JakartaSurabayaBandungMedanPalembang

Key Facts about WIB

•Indonesia spans three time zones: WIB (UTC+07:00), WITA (UTC+08:00) and WIT (UTC+09:00).
•Indonesia has not observed daylight saving time since 1964.
•Jakarta is the largest city in Southeast Asia by population.
•WIB shares the UTC+07:00 offset with Indochina Time.

Daylight Saving:No – UTC+07:00 year-round

Learn more about WIB on Wikipedia

COT vs WIB: Offsets, DST and Best Call Times

COT runs on Colombia Time (COT) at UTC-05:00. WIB runs on Western Indonesia Time (WIB) at UTC+07:00. That puts COT 12 hours ahead of WIB — a difference of +12h at the current offsets.

In practice, when it is 9:00 AM in COT it is 9:00 PM in WIB. Midnight in COT is 12:00 PM in WIB. Neither zone observes daylight saving time, so the offset between them stays constant all year.

COT to WIB time conversion table

COT (COT)	WIB (WIB)	Day
12:00 AM	12:00 PM	same day
6:00 AM	6:00 PM	same day
7:00 AM	7:00 PM	same day
8:00 AM	8:00 PM	same day
9:00 AM	9:00 PM	same day
12:00 PM	12:00 AM	next day
3:00 PM	3:00 AM	next day
5:00 PM	5:00 AM	next day
6:00 PM	6:00 AM	next day
9:00 PM	9:00 AM	next day

Why people convert COT to WIB time

Scheduling a call from COT to WIB: a 10:00 AM start in COT lands at 10:00 PM in WIB, so you can confirm the slot without doing the arithmetic yourself.
Handling a +12h gap: COT and WIB 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 WIB is 9:00 PM in COT.
Coordinating a COT-based team with WIB contacts: quoting times in the other side's local clock — not your own — removes the single biggest source of missed meetings.

Always state the zone abbreviation, not just the hour. "3:00 PM COT" is unambiguous; "3 PM" across a +12h gap is not.
With a +12h gap there is no shared 9-to-5 window, so alternate the early start: one week COT takes the early slot, the next week WIB 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 WIB (Western Indonesia Time)

Western Indonesia Time (WIB, Waktu Indonesia Barat) is one of Indonesia's three time zones, fixed at UTC+07:00 all year. It covers Java, Sumatra, West Kalimantan and the provinces around them — home to Jakarta, the country's capital and largest city, plus Surabaya and Bandung. Indonesia does not observe daylight saving time, so WIB never shifts. WIB shares its UTC+07:00 offset with Indochina Time (ICT) and Christmas Island Time, but is a distinct zone covering the western half of the Indonesian archipelago. The country's other zones are WITA (UTC+08:00) in the centre and WIT (UTC+09:00) in the east.

Best time to call between COT and WIB

With a +12h offset there is no overlap inside a normal 9 AM – 5 PM day. WIB opens at 9:00 AM WIB, which is 9:00 PM in COT, so real-time calls need an early-morning or late-evening slot on one side.

Business hours overlap

COT and WIB have no shared working hours because of the +12h gap. Teams need to alternate early starts or rely on asynchronous handovers.

COT is 12 hours ahead of WIB (COT UTC-05:00 → WIB UTC+07:00). 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 WIB?

COT (COT, UTC-05:00) is 12 hours ahead of WIB (WIB, UTC+07:00). The gap is currently +12h.

How do I convert COT time to WIB time?

Add +12h to COT local time. For example, 9:00 AM in COT is 9:00 PM in WIB.

What time is it in WIB right now?

WIB uses WIB at UTC+07:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +12h offset from COT.