Sri Lanka to Osaka
+3h 30mSri Lanka
ISTSOURCEOsaka
JSTGreen rows indicate typical business hours (9 AM - 5 PM)
IST and JST on the World Map
The map below highlights the IST (India Standard Time) and JST (Japan Standard 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.
JST – Japan Standard Time
UTC+09:00Japan Standard Time (JST) is the time zone for Japan, 9 hours ahead of UTC.
- •Japan does not observe daylight saving time.
- •Tokyo is the most populous metropolitan area in the world.
- •The Tokyo Stock Exchange operates from 9:00 AM to 3:00 PM JST.
- •JST is 14 hours ahead of EST and 9 hours ahead of GMT.
About Osaka
WikipediaOsaka operates on Japan Standard Time (JST), UTC+9. As Japan's second economic center and a manufacturing hub, Osaka shares business hours with Tokyo.
Osaka Castle was originally built in 1583 and has been rebuilt several times.
Sri Lanka to Osaka Time Difference – Complete Guide
Sri Lanka runs on India Standard Time (IST) at UTC+05:30. Osaka runs on Japan Standard Time (JST) at UTC+09:00. That puts Sri Lanka 3 hours 30 minutes ahead of Osaka — a difference of +3h 30m at the current offsets.
In practice, when it is 9:00 AM in Sri Lanka it is 12:30 PM in Osaka. Midnight in Sri Lanka is 3:30 AM in Osaka. Neither zone observes daylight saving time, so the offset between them stays constant all year.
Sri Lanka to Osaka time conversion table
| Sri Lanka (IST) | Osaka (JST) | Day |
|---|---|---|
| 12:00 AM | 3:30 AM | same day |
| 6:00 AM | 9:30 AM | same day |
| 7:00 AM | 10:30 AM | same day |
| 8:00 AM | 11:30 AM | same day |
| 9:00 AM | 12:30 PM | same day |
| 12:00 PM | 3:30 PM | same day |
| 3:00 PM | 6:30 PM | same day |
| 5:00 PM | 8:30 PM | same day |
| 6:00 PM | 9:30 PM | same day |
| 9:00 PM | 12:30 AM | next day |
Why people convert Sri Lanka to Osaka time
- Scheduling a call from Sri Lanka to Osaka: a 10:00 AM start in Sri Lanka lands at 1:30 PM in Osaka, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both Sri Lanka and Osaka are inside the 9-to-5 working day between 9:00 AM and 1:30 PM IST time (12:30 PM–5:00 PM JST). That is roughly 4 hours 30 minutes of usable overlap.
- Booking travel or deliveries: tracking Osaka local time against Sri Lanka keeps pickup windows and arrival estimates honest across the +3h 30m offset.
- Always state the zone abbreviation, not just the hour. "3:00 PM IST" is unambiguous; "3 PM" across a +3h 30m gap is not.
- Block 9:00 AM–1:30 PM IST as the recurring meeting window if you work primarily from Sri Lanka and need Osaka 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 JST (Japan Standard Time)
Japan Standard Time (JST) is the standard time zone for all of Japan. Japan does not observe daylight saving time. JST is 9 hours ahead of UTC and 14 hours ahead of EST. The Tokyo Stock Exchange, the world's third largest by market capitalization, operates on JST. South Korea uses the same offset (KST) but it is a distinct time zone.
Best time to call between Sri Lanka and Osaka
Both Sri Lanka and Osaka sit inside the 9 AM – 5 PM working day between 9:00 AM–1:30 PM IST, which is 12:30 PM–5:00 PM JST. That gives roughly 4 hours and 30 minutes of shared time — the safest window for a live call or meeting.
Business hours overlap
Sri Lanka and Osaka overlap for about 4 hours during the working day — enough for meetings if you avoid the edges of the window.
Sri Lanka is 3 hours 30 minutes ahead of Osaka (IST UTC+05:30 → JST UTC+09:00). The shared working window is 9:00 AM–1:30 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 Osaka?
Sri Lanka (IST, UTC+05:30) is 3 hours 30 minutes ahead of Osaka (JST, UTC+09:00). The gap is currently +3h 30m.
How do I convert Sri Lanka time to Osaka time?
Add +3h 30m to Sri Lanka local time. For example, 9:00 AM in Sri Lanka is 12:30 PM in Osaka.
What time is it in Osaka right now?
Osaka uses JST at UTC+09:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +3h 30m offset from Sri Lanka.
What is the best time to call Osaka from Sri Lanka?
Call between 9:00 AM and 1:30 PM IST — that maps to 12:30 PM–5:00 PM JST and keeps both parties inside the working day.
Which is ahead, Sri Lanka or Osaka?
Sri Lanka is 3 hours 30 minutes ahead of Osaka. When it is 12:00 PM in Sri Lanka it is 3:30 PM in Osaka.
Do Sri Lanka and Osaka use different time zones?
Sri Lanka (Sri Lanka) uses IST at UTC+05:30, while Osaka (Japan) uses JST at UTC+09:00. The IANA identifiers are Asia/Colombo and Asia/Tokyo.
Does daylight saving time affect the Sri Lanka–Osaka difference?
Neither zone observes daylight saving time, so the +3h 30m offset between Sri Lanka and Osaka 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 Osaka?
Not normally. The +3h 30m gap only pushes the date over for late-evening times.
What is the time difference between Sri Lanka and Osaka?
Osaka is +3h 30m from Sri Lanka.
What timezone is Sri Lanka in?
Sri Lanka operates on its local timezone.
What timezone is Osaka in?
Osaka operates on Japan Standard Time (JST), UTC+9. As Japan's second economic center and a manufacturing hub, Osaka shares business hours with Tokyo.
What are the business hours in Osaka?
Standard business hours in Osaka are 9:00 AM - 6:00 PM JST.
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 JST timezone?
Major cities in the JST timezone include Tokyo, Osaka, Yokohama, Nagoya, Sapporo, Kyoto, Kobe, Fukuoka.
What is the UTC offset for JST?
Japan Standard Time (JST) is at UTC+09:00.
What should I know about the JST timezone?
Japan does not observe daylight saving time. Tokyo is the most populous metropolitan area in the world.
When is it midnight in Sri Lanka, what time is it in Osaka?
When it is 12:00 AM (midnight) in Sri Lanka (IST), it is +3h 30m later in Osaka (JST).
Related Developer Tools
Explore more tools that work great with timezone conversions for international teams:
Related Timezone Conversions
More Sri Lanka time conversions
- sri lanka to colombo
- sri lanka to new york
- sri lanka to london
- sri lanka to dubai
- sri lanka to tokyo
- sri lanka to singapore
- sri lanka to sydney
- sri lanka to los angeles
- sri lanka to paris
- sri lanka to delhi
- sri lanka to mumbai
- sri lanka to berlin
- sri lanka to hong kong
- sri lanka to toronto
- sri lanka to kathmandu
- new york to sri lanka
- london to sri lanka
- dubai to sri lanka
- tokyo to sri lanka
- singapore to sri lanka
- sydney to sri lanka
- los angeles to sri lanka
- paris to sri lanka
- delhi to sri lanka
- mumbai to sri lanka
- berlin to sri lanka
- hong kong to sri lanka
- toronto to sri lanka
- kathmandu to sri lanka
See every conversion from Sri Lanka →·See every conversion from Osaka →