IST to WIB Converter & Meeting Planner
Quick answer: 9:00 AM IST = 10:30 AM WIB (fixed +05:30 standard offset — not DST-adjusted). Use the interactive converter below for DST-aware local-time scheduling.
Planning a call or meeting between Indian Standard Time (IST) and Western Indonesian Time (WIB)? You need to account for the standard time difference. Western Indonesian Time is normally 1.5 hours ahead of Indian Standard Time. Whether you are coordinating between teams in Mumbai and New Delhi and Jakarta and Surabaya, our live tool has you covered. Use our interactive overlap studio below to find the perfect waking hours for both regions, taking into account any seasonal Daylight Saving Time (DST) changes.
24-Hour Conversion Table
Quick reference: 12:00 AM IST = 1:30 AM WIB. The full 24-hour IST to WIB table below uses fixed standard offsets for exact abbreviation searches.
Example: 3:00 PM IST = 4:30 PM WIB.
| IST Time | WIB Time |
|---|---|
| 12:00 AM (00:00) | 1:30 AM (01:30) |
| 1:00 AM (01:00) | 2:30 AM (02:30) |
| 2:00 AM (02:00) | 3:30 AM (03:30) |
| 3:00 AM (03:00) | 4:30 AM (04:30) |
| 4:00 AM (04:00) | 5:30 AM (05:30) |
| 5:00 AM (05:00) | 6:30 AM (06:30) |
| 6:00 AM (06:00) | 7:30 AM (07:30) |
| 7:00 AM (07:00) | 8:30 AM (08:30) |
| 8:00 AM (08:00) | 9:30 AM (09:30) |
| 9:00 AM (09:00) | 10:30 AM (10:30) |
| 10:00 AM (10:00) | 11:30 AM (11:30) |
| 11:00 AM (11:00) | 12:30 PM (12:30) |
| 12:00 PM (12:00) | 1:30 PM (13:30) |
| 1:00 PM (13:00) | 2:30 PM (14:30) |
| 2:00 PM (14:00) | 3:30 PM (15:30) |
| 3:00 PM (15:00) | 4:30 PM (16:30) |
| 4:00 PM (16:00) | 5:30 PM (17:30) |
| 5:00 PM (17:00) | 6:30 PM (18:30) |
| 6:00 PM (18:00) | 7:30 PM (19:30) |
| 7:00 PM (19:00) | 8:30 PM (20:30) |
| 8:00 PM (20:00) | 9:30 PM (21:30) |
| 9:00 PM (21:00) | 10:30 PM (22:30) |
| 10:00 PM (22:00) | 11:30 PM (23:30) |
| 11:00 PM (23:00) | 12:30 AM (00:30)+1 day |
Best time to call Jakarta from Mumbai
For most work calls, compare the normal business day in Mumbai (IST) with the business day in Jakarta (WIB). IST commonly covers South Asia, while WIB is mainly associated with Southeast Asia.
⚠️ Note: 2026-07-05 is not a normal workday in one or both regions based on their configured calendar. The overlap below should be treated as a reference, not a guaranteed office-hours window.
✅ The most practical overlap on 2026-07-05 is usually 9:30 AM - 3:30 PM IST, which corresponds to 11:00 AM - 5:00 PM WIB. This window sits inside the typical IST workday (9:30 AM - 6:30 PM) and the WIB workday (9:00 AM - 5:00 PM).
- DST Safety: Neither IST nor WIB uses Daylight Saving Time in our dataset, making business-hour relationships stable year-round.
- Bombay Stock Exchange (BSE): 09:15-15:30 local time in Mumbai.
- Indonesia Stock Exchange (IDX): 09:00-16:00 local time in Jakarta.
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Frequently Asked Questions
What is the time difference between IST and WIB?
During standard time, Western Indonesian Time is 1.5 hours ahead of Indian Standard Time.
Does India observe Daylight Saving Time (DST)?
India does not observe Daylight Saving Time and has not done so since 1945. IST remains fixed at UTC+5:30 every day of the year, meaning the offset between India and any DST-observing country shifts by one hour twice annually when those countries change their clocks.
Why does IST have a 30-minute offset?
India chose the 82.5° East meridian — which passes through Mirzapur in Uttar Pradesh — as its central reference longitude, as it bisects the subcontinent geographically. That meridian sits exactly 5 hours and 30 minutes ahead of the Prime Meridian in Greenwich, producing the UTC+5:30 offset that has defined IST since 1906.
Does Indonesia observe Daylight Saving Time?
Indonesia does not observe Daylight Saving Time and has not done so since 1963. WIB remains fixed at UTC+07:00 year-round, providing consistent, predictable scheduling for businesses and travelers operating across Indonesian time zones.
Which areas of Indonesia use WIB?
WIB applies to Indonesia's westernmost islands: Sumatra, Java, West Kalimantan, and Central Kalimantan. These regions encompass the country's largest population centers and its political and economic capital, Jakarta.