Does it handle Daylight Saving Time?

Yes, the tool automatically adjusts for Daylight Saving Time based on the specific date you select, ensuring accurate conversions year-round.

Can I add multiple cities?

Yes, you can add as many cities as you need to the dashboard to compare times across your entire global network simultaneously.

IST to Indonesia

+1h 30m

IST

ISTSOURCE

UTC+05:30

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Indonesia

WIB

UTC+07:00

HH01

MM30

13:30 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

IST

Indonesia

12:00 AM

1:30 AM

2:00 AM

3:30 AM

4:00 AM

5:30 AM

6:00 AM

7:30 AM

8:00 AM

9:30 AM

10:00 AM

11:30 AM

12:00 PM

1:30 PM

2:00 PM

3:30 PM

4:00 PM

5:30 PM

6:00 PM

7:30 PM

8:00 PM

9:30 PM

10:00 PM

11:30 PM

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

IST and WIB on the World Map

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

IST Zone

→

WIB Zone

Explore all world timezones interactively →

IST – India Standard Time

UTC+05:30

India Standard Time (IST) is the time zone for India and Sri Lanka, 5 hours and 30 minutes ahead of UTC.

Countries in IST

IndiaSri Lanka

Major Cities in IST

MumbaiDelhiBangaloreKolkataChennaiHyderabadPuneAhmedabadColomboJaipurLucknowSurat

Key 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.
•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.

Daylight Saving:No – UTC+05:30 year-round

Learn more about IST 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

Time Conversion Guide: IST to Indonesia

IST runs on India Standard Time (IST) at UTC+05:30. Indonesia runs on Western Indonesia Time (WIB) at UTC+07:00. That puts IST 1 hour 30 minutes ahead of Indonesia — a difference of +1h 30m at the current offsets.

In practice, when it is 9:00 AM in IST it is 10:30 AM in Indonesia. Midnight in IST is 1:30 AM in Indonesia. Neither zone observes daylight saving time, so the offset between them stays constant all year.

IST to Indonesia time conversion table

IST (IST)	Indonesia (WIB)	Day
12:00 AM	1:30 AM	same day
6:00 AM	7:30 AM	same day
7:00 AM	8:30 AM	same day
8:00 AM	9:30 AM	same day
9:00 AM	10:30 AM	same day
12:00 PM	1:30 PM	same day
3:00 PM	4:30 PM	same day
5:00 PM	6:30 PM	same day
6:00 PM	7:30 PM	same day
9:00 PM	10:30 PM	same day

Why people convert IST to Indonesia time

Scheduling a call from IST to Indonesia: a 10:00 AM start in IST lands at 11:30 AM in Indonesia, so you can confirm the slot without doing the arithmetic yourself.
Finding shared working hours: both IST and Indonesia are inside the 9-to-5 working day between 9:00 AM and 3:30 PM IST time (10:30 AM–5:00 PM WIB). That is roughly 6 hours 30 minutes of usable overlap.
Watching a live event or market open: IST viewers need 10:30 AM in Indonesia to catch a 9:00 AM start there, and 10:30 PM if the event is anchored to IST.

Always state the zone abbreviation, not just the hour. "3:00 PM IST" is unambiguous; "3 PM" across a +1h 30m gap is not.
Block 9:00 AM–3:30 PM IST as the recurring meeting window if you work primarily from IST and need Indonesia colleagues present.

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 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 IST and Indonesia

Both IST and Indonesia sit inside the 9 AM – 5 PM working day between 9:00 AM–3:30 PM IST, which is 10:30 AM–5:00 PM WIB. That gives roughly 6 hours and 30 minutes of shared time — the safest window for a live call or meeting.

Business hours overlap

IST and Indonesia share 6 hours of working-hours overlap (9:00 AM–3:30 PM IST), so scheduling a live meeting is straightforward.

IST is 1 hour 30 minutes ahead of Indonesia (IST UTC+05:30 → WIB UTC+07:00). The shared working window is 9:00 AM–3:30 PM IST. 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 IST and Indonesia?

IST (IST, UTC+05:30) is 1 hour 30 minutes ahead of Indonesia (WIB, UTC+07:00). The gap is currently +1h 30m.

How do I convert IST time to Indonesia time?

Add +1h 30m to IST local time. For example, 9:00 AM in IST is 10:30 AM in Indonesia.

What time is it in Indonesia right now?

Indonesia 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 +1h 30m offset from IST.