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).

Mumbai to Indonesia

+1h 30m

Mumbai

ISTSOURCE

India · 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

Mumbai

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

About Mumbai

Wikipedia

Mumbai operates on India Standard Time (IST), UTC+5:30. As India's financial capital and home to BSE (Asia's oldest stock exchange), Mumbai timing is crucial for Asia markets.

Population:12.4 million

Metro:21.3 million

Business Hours:9:30 AM - 5:30 PM IST

Currency:INR (₹)

Stock Exchange:BSE (Bombay Stock Exchange), NSE

Key Landmarks

Gateway of IndiaChhatrapati Shivaji TerminusMarine DriveElephanta CavesHaji Ali Dargah

Did You Know?

The Mumbai local trains carry over 7.5 million passengers daily.

Learn more about IST timezone →

Mumbai to Indonesia Time Difference – Complete Guide

Mumbai runs on India Standard Time (IST) at UTC+05:30. Indonesia runs on Western Indonesia Time (WIB) at UTC+07:00. That puts Mumbai 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 Mumbai it is 10:30 AM in Indonesia. Midnight in Mumbai is 1:30 AM in Indonesia. Neither zone observes daylight saving time, so the offset between them stays constant all year.

Mumbai to Indonesia time conversion table

Mumbai (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 Mumbai to Indonesia time

Scheduling a call from Mumbai to Indonesia: a 10:00 AM start in Mumbai lands at 11:30 AM in Indonesia, so you can confirm the slot without doing the arithmetic yourself.
Finding shared working hours: both Mumbai 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.
Booking travel or deliveries: tracking Indonesia local time against Mumbai keeps pickup windows and arrival estimates honest across the +1h 30m offset.

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 Mumbai 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 Mumbai and Indonesia

Both Mumbai 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

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

Mumbai 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 Mumbai and Indonesia?

Mumbai (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 Mumbai time to Indonesia time?

Add +1h 30m to Mumbai local time. For example, 9:00 AM in Mumbai 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 Mumbai.

What is the best time to call Indonesia from Mumbai?

Call between 9:00 AM and 3:30 PM IST — that maps to 10:30 AM–5:00 PM WIB and keeps both parties inside the working day.

Which is ahead, Mumbai or Indonesia?

Mumbai is 1 hour 30 minutes ahead of Indonesia. When it is 12:00 PM in Mumbai it is 1:30 PM in Indonesia.

Do Mumbai and Indonesia use different time zones?

Mumbai (India) uses IST at UTC+05:30, while Indonesia (Indonesia) uses WIB at UTC+07:00. The IANA identifiers are Asia/Kolkata and Asia/Jakarta.

Does daylight saving time affect the Mumbai–Indonesia difference?

Neither zone observes daylight saving time, so the +1h 30m offset between Mumbai and Indonesia is fixed all year.

Which other cities share Mumbai's time zone?

IST also covers Mumbai, Delhi, Bangalore, Kolkata, Chennai, Hyderabad, Pune, Ahmedabad and 4 more.

Which countries use IST, Mumbai's zone?

IST is used in India, Sri Lanka.

Is there a day difference between Mumbai and Indonesia?

Not normally. The +1h 30m gap only pushes the date over for late-evening times.

What is the time difference between Mumbai and Indonesia?

Indonesia is +1h 30m from Mumbai.

What timezone is Mumbai in?

Mumbai operates on India Standard Time (IST), UTC+5:30. As India's financial capital and home to BSE (Asia's oldest stock exchange), Mumbai timing is crucial for Asia markets.