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).

WIB to TRT

-4h

WIB

WIBSOURCE

UTC+07:00

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

TRT

UTC+03:00

HH08

MM00

08:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

WIB

TRT

12:00 AM

8:00 PM-1

2:00 AM

10:00 PM-1

4:00 AM

12:00 AM

6:00 AM

2:00 AM

8:00 AM

4:00 AM

10:00 AM

6:00 AM

12:00 PM

8:00 AM

2:00 PM

10:00 AM

4:00 PM

12:00 PM

6:00 PM

2:00 PM

8:00 PM

4:00 PM

10:00 PM

6:00 PM

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

WIB and TRT on the World Map

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

WIB Zone

→

TRT Zone

Explore all world timezones interactively →

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

TRT – Turkey Time

UTC+03:00

Turkey Time (TRT, UTC+03:00) is the single time zone used across Turkey, fixed year round since 2016.

Countries in TRT

Turkey

Major Cities in TRT

IstanbulAnkaraIzmirBursaAntalya

Key Facts about TRT

•Turkey has used a permanent UTC+03:00 since September 2016.
•TRT is level with Moscow Standard Time and Arabia Standard Time all year.
•Because Turkey kept summer time permanently, western cities see very late winter sunrises.
•Turkey previously observed daylight saving time from 1973 to 2016.

Daylight Saving:No – UTC+03:00 year-round

Learn more about TRT on Wikipedia

Time Conversion Guide: WIB to TRT

WIB runs on Western Indonesia Time (WIB) at UTC+07:00. TRT runs on Turkey Time (TRT) at UTC+03:00. That puts WIB 4 hours behind TRT — a difference of -4h at the current offsets.

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

WIB to TRT time conversion table

WIB (WIB)	TRT (TRT)	Day
12:00 AM	8:00 PM	previous day
6:00 AM	2:00 AM	same day
7:00 AM	3:00 AM	same day
8:00 AM	4:00 AM	same day
9:00 AM	5:00 AM	same day
12:00 PM	8:00 AM	same day
3:00 PM	11:00 AM	same day
5:00 PM	1:00 PM	same day
6:00 PM	2:00 PM	same day
9:00 PM	5:00 PM	same day

Why people convert WIB to TRT time

Scheduling a call from WIB to TRT: a 10:00 AM start in WIB lands at 6:00 AM in TRT, so you can confirm the slot without doing the arithmetic yourself.
Finding shared working hours: both WIB and TRT are inside the 9-to-5 working day between 1:00 PM and 5:00 PM WIB time (9:00 AM–1:00 PM TRT). That is roughly 4 hours of usable overlap.
Watching a live event or market open: WIB viewers need 5:00 AM in TRT to catch a 9:00 AM start there, and 4:00 AM if the event is anchored to WIB.

Always state the zone abbreviation, not just the hour. "3:00 PM WIB" is unambiguous; "3 PM" across a -4h gap is not.
Block 1:00 PM–5:00 PM WIB as the recurring meeting window if you work primarily from WIB and need TRT colleagues present.

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.

About TRT (Turkey Time)

Turkey Time (TRT) is fixed at UTC+03:00 all year. Turkey abolished seasonal clock changes in September 2016, moving to a permanent UTC+03:00 so the whole country stays on what was formerly summer time. That leaves Istanbul, which sits close to 29°E, on an offset well ahead of its solar time — sunrise in mid-winter comes after 08:30 local. TRT shares its offset with Moscow Standard Time, Arabia Standard Time and East Africa Time, so Istanbul is level with Moscow and Riyadh all year and one hour ahead of Central European Time during the European winter.

Best time to call between WIB and TRT

Both WIB and TRT sit inside the 9 AM – 5 PM working day between 1:00 PM–5:00 PM WIB, which is 9:00 AM–1:00 PM TRT. That gives roughly 4 hours of shared time — the safest window for a live call or meeting.

Business hours overlap

WIB and TRT overlap for about 4 hours during the working day — enough for meetings if you avoid the edges of the window.

WIB is 4 hours behind TRT (WIB UTC+07:00 → TRT UTC+03:00). The shared working window is 1:00 PM–5:00 PM WIB. Remember to re-check around daylight-saving transitions.