Sri Lanka to Indonesia
+1h 30mSri Lanka
ISTSOURCEIndonesia
WIBGreen 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 – 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 – 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.
Understanding the +1h 30m Gap: Sri Lanka vs Indonesia
Sri Lanka runs on India Standard Time (IST) at UTC+05:30. Indonesia runs on Western Indonesia Time (WIB) at UTC+07:00. That puts Sri Lanka 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 Sri Lanka it is 10:30 AM in Indonesia. Midnight in Sri Lanka is 1:30 AM in Indonesia. Neither zone observes daylight saving time, so the offset between them stays constant all year.
Sri Lanka to Indonesia time conversion table
| Sri Lanka (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 Sri Lanka to Indonesia time
- Scheduling a call from Sri Lanka to Indonesia: a 10:00 AM start in Sri Lanka lands at 11:30 AM in Indonesia, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both Sri Lanka 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.
- Coordinating a Sri Lanka-based team with Indonesia contacts: quoting times in the other side's local clock — not your own — removes the single biggest source of missed meetings.
- 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 Sri Lanka 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 Sri Lanka and Indonesia
Both Sri Lanka 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
Sri Lanka and Indonesia share 6 hours of working-hours overlap (9:00 AM–3:30 PM IST), so scheduling a live meeting is straightforward.
Sri Lanka 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:
Frequently Asked Questions
What is the time difference between Sri Lanka and Indonesia?
Sri Lanka (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 Sri Lanka time to Indonesia time?
Add +1h 30m to Sri Lanka local time. For example, 9:00 AM in Sri Lanka 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 Sri Lanka.
What is the best time to call Indonesia from Sri Lanka?
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, Sri Lanka or Indonesia?
Sri Lanka is 1 hour 30 minutes ahead of Indonesia. When it is 12:00 PM in Sri Lanka it is 1:30 PM in Indonesia.
Do Sri Lanka and Indonesia use different time zones?
Sri Lanka (Sri Lanka) uses IST at UTC+05:30, while Indonesia (Indonesia) uses WIB at UTC+07:00. The IANA identifiers are Asia/Colombo and Asia/Jakarta.
Does daylight saving time affect the Sri Lanka–Indonesia difference?
Neither zone observes daylight saving time, so the +1h 30m offset between Sri Lanka and Indonesia is fixed all year.
Which other cities share Sri Lanka's time zone?
IST also covers Mumbai, Delhi, Bangalore, Kolkata, Chennai, Hyderabad, Pune, Ahmedabad and 4 more.
Which countries use IST, Sri Lanka's zone?
IST is used in India, Sri Lanka.
Is there a day difference between Sri Lanka and Indonesia?
Not normally. The +1h 30m gap only pushes the date over for late-evening times.
What is the time difference between Sri Lanka and Indonesia?
Indonesia is +1h 30m from Sri Lanka.
What timezone is Sri Lanka in?
Sri Lanka operates on its local timezone.
What timezone is Indonesia in?
Indonesia operates on its local timezone.
Which countries use IST (India Standard Time)?
IST is used in India, Sri Lanka.
Does IST observe daylight saving time?
No, IST does not observe daylight saving time and remains at UTC+05:30 year-round.
What are some interesting 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.
Which cities are in the WIB timezone?
Major cities in the WIB timezone include Jakarta, Surabaya, Bandung, Medan, Palembang.
What is the UTC offset for WIB?
Western Indonesia Time (WIB) is at UTC+07:00.
What should I know about the WIB timezone?
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.
When is it midnight in Sri Lanka, what time is it in Indonesia?
When it is 12:00 AM (midnight) in Sri Lanka (IST), it is +1h 30m later in Indonesia (WIB).
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