Bangkok to Sri Lanka
-1h 30mBangkok
ICTSOURCESri Lanka
ISTGreen rows indicate typical business hours (9 AM - 5 PM)
ICT and IST on the World Map
The map below highlights the ICT (Indochina Time) and IST (India Standard Time) timezone regions across the globe.
ICT – Indochina Time
UTC+07:00Indochina Time (ICT) is the time zone for Vietnam, Thailand, Laos, and Cambodia, 7 hours ahead of UTC.
- •Bangkok is one of the most visited cities in the world.
- •ICT is 12 hours ahead of EST.
- •Thailand, Vietnam, and Cambodia all share ICT.
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.
About Bangkok
WikipediaBangkok operates on Indochina Time (ICT), UTC+7. As Southeast Asia's largest economy hub, Bangkok bridges East Asian and South Asian business hours.
Bangkok is one of the world's most visited cities, with over 22 million visitors annually.
Everything You Need to Know About Bangkok and Sri Lanka Time
Bangkok runs on Indochina Time (ICT) at UTC+07:00. Sri Lanka runs on India Standard Time (IST) at UTC+05:30. That puts Bangkok 1 hour 30 minutes behind Sri Lanka — a difference of -1h 30m at the current offsets.
In practice, when it is 9:00 AM in Bangkok it is 7:30 AM in Sri Lanka. Midnight in Bangkok is 10:30 PM in Sri Lanka. Neither zone observes daylight saving time, so the offset between them stays constant all year.
Bangkok to Sri Lanka time conversion table
| Bangkok (ICT) | Sri Lanka (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 Bangkok to Sri Lanka time
- Scheduling a call from Bangkok to Sri Lanka: a 10:00 AM start in Bangkok lands at 8:30 AM in Sri Lanka, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both Bangkok and Sri Lanka are inside the 9-to-5 working day between 10:30 AM and 5:00 PM ICT time (9:00 AM–3:30 PM IST). That is roughly 6 hours 30 minutes of usable overlap.
- Watching a live event or market open: Bangkok viewers need 7:30 AM in Sri Lanka to catch a 9:00 AM start there, and 1:30 AM if the event is anchored to Bangkok.
- Always state the zone abbreviation, not just the hour. "3:00 PM ICT" is unambiguous; "3 PM" across a -1h 30m gap is not.
- Block 10:30 AM–5:00 PM ICT as the recurring meeting window if you work primarily from Bangkok and need Sri Lanka colleagues present.
About ICT (Indochina Time)
Indochina Time (ICT) is used across Southeast Asia including Vietnam, Thailand, Laos, and Cambodia. Indonesia (Western time, WIB) also uses UTC+07:00. ICT does not observe daylight saving time.
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 Bangkok and Sri Lanka
Both Bangkok and Sri Lanka sit inside the 9 AM – 5 PM working day between 10:30 AM–5:00 PM ICT, 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
Bangkok and Sri Lanka share 6 hours of working-hours overlap (10:30 AM–5:00 PM ICT), so scheduling a live meeting is straightforward.
Bangkok is 1 hour 30 minutes behind Sri Lanka (ICT UTC+07:00 → IST UTC+05:30). The shared working window is 10:30 AM–5:00 PM ICT. 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 Bangkok and Sri Lanka?
Bangkok (ICT, UTC+07:00) is 1 hour 30 minutes behind Sri Lanka (IST, UTC+05:30). The gap is currently -1h 30m.
How do I convert Bangkok time to Sri Lanka time?
Add -1h 30m to Bangkok local time. For example, 9:00 AM in Bangkok is 7:30 AM in Sri Lanka.
What time is it in Sri Lanka right now?
Sri Lanka 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 Bangkok.
What is the best time to call Sri Lanka from Bangkok?
Call between 10:30 AM and 5:00 PM ICT — that maps to 9:00 AM–3:30 PM IST and keeps both parties inside the working day.
Which is behind, Bangkok or Sri Lanka?
Bangkok is 1 hour 30 minutes behind Sri Lanka. When it is 12:00 PM in Bangkok it is 10:30 AM in Sri Lanka.
Do Bangkok and Sri Lanka use different time zones?
Bangkok (Thailand) uses ICT at UTC+07:00, while Sri Lanka (Sri Lanka) uses IST at UTC+05:30. The IANA identifiers are Asia/Bangkok and Asia/Colombo.
Does daylight saving time affect the Bangkok–Sri Lanka difference?
Neither zone observes daylight saving time, so the -1h 30m offset between Bangkok and Sri Lanka is fixed all year.
Which other cities share Bangkok's time zone?
ICT also covers Bangkok, Ho Chi Minh City, Hanoi, Jakarta, Phnom Penh, Vientiane.
Which countries use ICT, Bangkok's zone?
ICT is used in Thailand, Vietnam, Cambodia, Laos, Indonesia (WIB).
Is there a day difference between Bangkok and Sri Lanka?
Not normally. The -1h 30m gap only pushes the date over the previous day.
What is the time difference between Bangkok and Sri Lanka?
Sri Lanka is -1h 30m from Bangkok.
What timezone is Bangkok in?
Bangkok operates on Indochina Time (ICT), UTC+7. As Southeast Asia's largest economy hub, Bangkok bridges East Asian and South Asian business hours.
What timezone is Sri Lanka in?
Sri Lanka operates on its local timezone.
What are the business hours in Bangkok?
Standard business hours in Bangkok are 8:30 AM - 5:30 PM ICT.
Which countries use ICT (Indochina Time)?
ICT is used in Thailand, Vietnam, Cambodia, Laos, Indonesia (WIB).
Does ICT observe daylight saving time?
No, ICT does not observe daylight saving time and remains at UTC+07:00 year-round.
What are some interesting facts about ICT?
Bangkok is one of the most visited cities in the world. ICT is 12 hours ahead of EST.
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 Bangkok, what time is it in Sri Lanka?
When it is 12:00 AM (midnight) in Bangkok (ICT), it is -1h 30m later in Sri Lanka (IST).
Related Developer Tools
Explore more tools that work great with timezone conversions for international teams:
Related Timezone Conversions
More Bangkok time conversions
- bangkok to ict
- bangkok to thailand
- bangkok to dubai
- bangkok to mumbai
- bangkok to delhi
- bangkok to bangalore
- bangkok to kathmandu
- bangkok to singapore
- bangkok to hong kong
- bangkok to shanghai
- bangkok to beijing
- bangkok to tokyo
- bangkok to osaka
- bangkok to seoul
- bangkok to new york
- bangkok to london
- bangkok to sydney
- bangkok to los angeles
- bangkok to paris
- bangkok to berlin
- bangkok to toronto
- new york to bangkok
- london to bangkok
- dubai to bangkok
- tokyo to bangkok
- singapore to bangkok
- sydney to bangkok
- los angeles to bangkok
- paris to bangkok
- delhi to bangkok
- mumbai to bangkok
- berlin to bangkok
- hong kong to bangkok
- toronto to bangkok
- kathmandu to bangkok
See every conversion from Bangkok →·See every conversion from Sri Lanka →