WIB to IST
-1h 30mWIB
WIBSOURCEIST
ISTGreen rows indicate typical business hours (9 AM - 5 PM)
WIB and IST on the World Map
The map below highlights the WIB (Western Indonesia Time) and IST (India Standard Time) timezone regions across the globe.
WIB – Western Indonesia Time
UTC+07:00Western Indonesia Time (WIB, UTC+07:00) covers Java, Sumatra and West Kalimantan, including Jakarta.
- •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.
IST – India Standard Time
UTC+05:30India Standard Time (IST) is the time zone for India and Sri Lanka, 5 hours and 30 minutes ahead of UTC.
- •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.
WIB vs IST: Offsets, DST and Best Call Times
WIB runs on Western Indonesia Time (WIB) at UTC+07:00. IST runs on India Standard Time (IST) at UTC+05:30. That puts WIB 1 hour 30 minutes behind IST — a difference of -1h 30m at the current offsets.
In practice, when it is 9:00 AM in WIB it is 7:30 AM in IST. Midnight in WIB is 10:30 PM in IST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
WIB to IST time conversion table
| WIB (WIB) | IST (IST) | Day |
|---|---|---|
| 12:00 AM | 10:30 PM | previous day |
| 6:00 AM | 4:30 AM | same day |
| 7:00 AM | 5:30 AM | same day |
| 8:00 AM | 6:30 AM | same day |
| 9:00 AM | 7:30 AM | same day |
| 12:00 PM | 10:30 AM | same day |
| 3:00 PM | 1:30 PM | same day |
| 5:00 PM | 3:30 PM | same day |
| 6:00 PM | 4:30 PM | same day |
| 9:00 PM | 7:30 PM | same day |
Why people convert WIB to IST time
- Scheduling a call from WIB to IST: a 10:00 AM start in WIB lands at 8:30 AM in IST, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both WIB and IST are inside the 9-to-5 working day between 10:30 AM and 5:00 PM WIB time (9:00 AM–3:30 PM IST). That is roughly 6 hours 30 minutes of usable overlap.
- Keeping family and friends in sync: knowing that 8:00 PM in WIB is 6:30 PM in IST 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 -1h 30m gap is not.
- Block 10:30 AM–5:00 PM WIB as the recurring meeting window if you work primarily from WIB and need IST 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 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.
Best time to call between WIB and IST
Both WIB and IST sit inside the 9 AM – 5 PM working day between 10:30 AM–5:00 PM WIB, which is 9:00 AM–3:30 PM IST. That gives roughly 6 hours and 30 minutes of shared time — the safest window for a live call or meeting.
Business hours overlap
WIB and IST share 6 hours of working-hours overlap (10:30 AM–5:00 PM WIB), so scheduling a live meeting is straightforward.
WIB is 1 hour 30 minutes behind IST (WIB UTC+07:00 → IST UTC+05:30). The shared working window is 10:30 AM–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:
Frequently Asked Questions
What is the time difference between WIB and IST?
WIB (WIB, UTC+07:00) is 1 hour 30 minutes behind IST (IST, UTC+05:30). The gap is currently -1h 30m.
How do I convert WIB time to IST time?
Add -1h 30m to WIB local time. For example, 9:00 AM in WIB is 7:30 AM in IST.
What time is it in IST right now?
IST uses IST at UTC+05:30. Use the live converter at the top of this page — it updates in real time and already accounts for the -1h 30m offset from WIB.
What is the best time to call IST from WIB?
Call between 10:30 AM and 5:00 PM WIB — that maps to 9:00 AM–3:30 PM IST and keeps both parties inside the working day.
Which is behind, WIB or IST?
WIB is 1 hour 30 minutes behind IST. When it is 12:00 PM in WIB it is 10:30 AM in IST.
Does daylight saving time affect the WIB–IST difference?
Neither zone observes daylight saving time, so the -1h 30m offset between WIB and IST is fixed all year.
Which other cities share WIB's time zone?
WIB also covers Jakarta, Surabaya, Bandung, Medan, Palembang.
Which countries use WIB, WIB's zone?
WIB is used in Indonesia (Java, Sumatra, West Kalimantan).
Is there a day difference between WIB and IST?
Not normally. The -1h 30m gap only pushes the date over the previous day.
What is the time difference between WIB and IST?
IST is -1h 30m from WIB.
What timezone is WIB in?
WIB operates on its local timezone.
What timezone is IST in?
IST operates on its local timezone.
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 IST timezone?
Major cities in the IST timezone include Mumbai, Delhi, Bangalore, Kolkata, Chennai, Hyderabad, Pune, Ahmedabad.
What is the UTC offset for IST?
India Standard Time (IST) is at UTC+05:30.
What should I know about the IST timezone?
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.
When is it midnight in WIB, what time is it in IST?
When it is 12:00 AM (midnight) in WIB (WIB), it is -1h 30m later in IST (IST).
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