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).

Jakarta to IRST

-3h 30m

Jakarta

WIBSOURCE

Indonesia · UTC+07:00

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

IRST

UTC+03:30

HH08

MM30

08:30 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

Jakarta

IRST

12:00 AM

8:30 PM-1

2:00 AM

10:30 PM-1

4:00 AM

12:30 AM

6:00 AM

2:30 AM

8:00 AM

4:30 AM

10:00 AM

6:30 AM

12:00 PM

8:30 AM

2:00 PM

10:30 AM

4:00 PM

12:30 PM

6:00 PM

2:30 PM

8:00 PM

4:30 PM

10:00 PM

6:30 PM

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

WIB and IRST on the World Map

The map below highlights the WIB (Western Indonesia Time) and IRST (Iran Standard Time) timezone regions across the globe.

WIB Zone

→

IRST 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

IRST – Iran Standard Time

UTC+03:30

Iran Standard Time (IRST) is the time zone for Iran, 3 hours and 30 minutes ahead of UTC.

Countries in IRST

Iran

Major Cities in IRST

TehranIsfahanMashhadTabrizShirazKaraj

Key Facts about IRST

•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.

Daylight Saving:Yes – switches to IRDT

Learn more about IRST on Wikipedia

About Jakarta

Wikipedia

Jakarta operates on Western Indonesia Time (WIB), UTC+7. As Southeast Asia's largest economy, Jakarta's IDX is a key emerging market exchange.

Population:10.5 million

Metro:34.5 million

Business Hours:8:00 AM - 5:00 PM WIB

Currency:IDR (Rp)

Stock Exchange:IDX (Indonesia Stock Exchange)

Key Landmarks

MonasIstiqlal MosqueOld Town (Kota Tua)Taman MiniAncol Dreamland

Did You Know?

Indonesia has 3 time zones; Jakarta uses Western Indonesia Time (WIB).

Learn more about WIB timezone →

Understanding the -3h 30m Gap: Jakarta vs IRST

Jakarta runs on Western Indonesia Time (WIB) at UTC+07:00. IRST runs on Iran Standard Time (IRST) at UTC+03:30. That puts Jakarta 3 hours 30 minutes behind IRST — a difference of -3h 30m at the current offsets.

In practice, when it is 9:00 AM in Jakarta it is 5:30 AM in IRST. Midnight in Jakarta is 8:30 PM in IRST. Neither zone observes daylight saving time, so the offset between them stays constant all year.

Jakarta to IRST time conversion table

Jakarta (WIB)	IRST (IRST)	Day
12:00 AM	8:30 PM	previous day
6:00 AM	2:30 AM	same day
7:00 AM	3:30 AM	same day
8:00 AM	4:30 AM	same day
9:00 AM	5:30 AM	same day
12:00 PM	8:30 AM	same day
3:00 PM	11:30 AM	same day
5:00 PM	1:30 PM	same day
6:00 PM	2:30 PM	same day
9:00 PM	5:30 PM	same day

Why people convert Jakarta to IRST time

Scheduling a call from Jakarta to IRST: a 10:00 AM start in Jakarta lands at 6:30 AM in IRST, so you can confirm the slot without doing the arithmetic yourself.
Finding shared working hours: both Jakarta and IRST are inside the 9-to-5 working day between 12:30 PM and 5:00 PM WIB time (9:00 AM–1:30 PM IRST). That is roughly 4 hours 30 minutes of usable overlap.
Keeping family and friends in sync: knowing that 8:00 PM in Jakarta is 4:30 PM in IRST makes it easy to avoid calling at 3 AM.

Always state the zone abbreviation, not just the hour. "3:00 PM WIB" is unambiguous; "3 PM" across a -3h 30m gap is not.
Block 12:30 PM–5:00 PM WIB as the recurring meeting window if you work primarily from Jakarta and need IRST 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 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 Jakarta and IRST

Both Jakarta and IRST sit inside the 9 AM – 5 PM working day between 12:30 PM–5:00 PM WIB, which is 9:00 AM–1:30 PM IRST. That gives roughly 4 hours and 30 minutes of shared time — the safest window for a live call or meeting.

Business hours overlap

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

Jakarta is 3 hours 30 minutes behind IRST (WIB UTC+07:00 → IRST UTC+03:30). The shared working window is 12:30 PM–5:00 PM WIB. 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 Jakarta and IRST?

Jakarta (WIB, UTC+07:00) is 3 hours 30 minutes behind IRST (IRST, UTC+03:30). The gap is currently -3h 30m.

How do I convert Jakarta time to IRST time?

Add -3h 30m to Jakarta local time. For example, 9:00 AM in Jakarta is 5:30 AM in IRST.

What time is it in IRST right now?

IRST 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 -3h 30m offset from Jakarta.

What is the best time to call IRST from Jakarta?

Call between 12:30 PM and 5:00 PM WIB — that maps to 9:00 AM–1:30 PM IRST and keeps both parties inside the working day.

Which is behind, Jakarta or IRST?

Jakarta is 3 hours 30 minutes behind IRST. When it is 12:00 PM in Jakarta it is 8:30 AM in IRST.

Do Jakarta and IRST use different time zones?

Jakarta (Indonesia) uses WIB at UTC+07:00, while IRST uses IRST at UTC+03:30. The IANA identifiers are Asia/Jakarta and Asia/Tehran.

Does daylight saving time affect the Jakarta–IRST difference?

Neither zone observes daylight saving time, so the -3h 30m offset between Jakarta and IRST is fixed all year.

Which other cities share Jakarta's time zone?

WIB also covers Jakarta, Surabaya, Bandung, Medan, Palembang.

Which countries use WIB, Jakarta's zone?

WIB is used in Indonesia (Java, Sumatra, West Kalimantan).

Is there a day difference between Jakarta and IRST?

Not normally. The -3h 30m gap only pushes the date over the previous day.

What is the time difference between Jakarta and IRST?

IRST is -3h 30m from Jakarta.

What timezone is Jakarta in?

Jakarta operates on Western Indonesia Time (WIB), UTC+7. As Southeast Asia's largest economy, Jakarta's IDX is a key emerging market exchange.

What timezone is IRST in?

IRST operates on its local timezone.

What are the business hours in Jakarta?

Standard business hours in Jakarta are 8:00 AM - 5:00 PM WIB.

Which countries use WIB (Western Indonesia Time)?

WIB is used in Indonesia (Java, Sumatra, West Kalimantan).

Does WIB observe daylight saving time?

No, WIB does not observe daylight saving time and remains at UTC+07:00 year-round.

What are some interesting 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.

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 Jakarta, what time is it in IRST?

When it is 12:00 AM (midnight) in Jakarta (WIB), it is -3h 30m later in IRST (IRST).

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Jakarta to IRST

Jakarta

IRST

WIB and IRST on the World Map

WIB – Western Indonesia Time

IRST – Iran Standard Time

About Jakarta

Understanding the -3h 30m Gap: Jakarta vs IRST

Jakarta to IRST time conversion table

Why people convert Jakarta to IRST time

About WIB (Western Indonesia Time)

About IRST (Iran Standard Time)

Best time to call between Jakarta and IRST

Business hours overlap

Learn More About Time

Frequently Asked Questions

What is the time difference between Jakarta and IRST?

How do I convert Jakarta time to IRST time?

What time is it in IRST right now?

What is the best time to call IRST from Jakarta?

Which is behind, Jakarta or IRST?

Do Jakarta and IRST use different time zones?

Does daylight saving time affect the Jakarta–IRST difference?

Which other cities share Jakarta's time zone?

Which countries use WIB, Jakarta's zone?

Is there a day difference between Jakarta and IRST?

What is the time difference between Jakarta and IRST?

What timezone is Jakarta in?

What timezone is IRST in?

What are the business hours in Jakarta?

Which countries use WIB (Western Indonesia Time)?

Does WIB observe daylight saving time?

What are some interesting facts about WIB?

Which cities are in the IRST timezone?

What is the UTC offset for IRST?

What should I know about the IRST timezone?

When is it midnight in Jakarta, what time is it in IRST?

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