Sri Lanka to Thailand
+1h 30mSri Lanka
ISTSOURCEThailand
ICTGreen rows indicate typical business hours (9 AM - 5 PM)
IST and ICT on the World Map
The map below highlights the IST (India Standard Time) and ICT (Indochina 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.
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.
Comparing Time Zones: Sri Lanka and Thailand
Sri Lanka runs on India Standard Time (IST) at UTC+05:30. Thailand runs on Indochina Time (ICT) at UTC+07:00. That puts Sri Lanka 1 hour 30 minutes ahead of Thailand — 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 Thailand. Midnight in Sri Lanka is 1:30 AM in Thailand. Neither zone observes daylight saving time, so the offset between them stays constant all year.
Sri Lanka to Thailand time conversion table
| Sri Lanka (IST) | Thailand (ICT) | 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 Thailand time
- Scheduling a call from Sri Lanka to Thailand: a 10:00 AM start in Sri Lanka lands at 11:30 AM in Thailand, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both Sri Lanka and Thailand are inside the 9-to-5 working day between 9:00 AM and 3:30 PM IST time (10:30 AM–5:00 PM ICT). That is roughly 6 hours 30 minutes of usable overlap.
- Keeping family and friends in sync: knowing that 8:00 PM in Sri Lanka is 9:30 PM in Thailand makes it easy to avoid calling at 3 AM.
- 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 Thailand 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 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.
Best time to call between Sri Lanka and Thailand
Both Sri Lanka and Thailand 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 ICT. 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 Thailand 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 Thailand (IST UTC+05:30 → ICT 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 Thailand?
Sri Lanka (IST, UTC+05:30) is 1 hour 30 minutes ahead of Thailand (ICT, UTC+07:00). The gap is currently +1h 30m.
How do I convert Sri Lanka time to Thailand time?
Add +1h 30m to Sri Lanka local time. For example, 9:00 AM in Sri Lanka is 10:30 AM in Thailand.
What time is it in Thailand right now?
Thailand uses ICT 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 Thailand from Sri Lanka?
Call between 9:00 AM and 3:30 PM IST — that maps to 10:30 AM–5:00 PM ICT and keeps both parties inside the working day.
Which is ahead, Sri Lanka or Thailand?
Sri Lanka is 1 hour 30 minutes ahead of Thailand. When it is 12:00 PM in Sri Lanka it is 1:30 PM in Thailand.
Do Sri Lanka and Thailand use different time zones?
Sri Lanka (Sri Lanka) uses IST at UTC+05:30, while Thailand (Thailand) uses ICT at UTC+07:00. The IANA identifiers are Asia/Colombo and Asia/Bangkok.
Does daylight saving time affect the Sri Lanka–Thailand difference?
Neither zone observes daylight saving time, so the +1h 30m offset between Sri Lanka and Thailand 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 Thailand?
Not normally. The +1h 30m gap only pushes the date over for late-evening times.
What is the time difference between Sri Lanka and Thailand?
Thailand is +1h 30m from Sri Lanka.
What timezone is Sri Lanka in?
Sri Lanka operates on its local timezone.
What timezone is Thailand in?
Thailand 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 ICT timezone?
Major cities in the ICT timezone include Bangkok, Ho Chi Minh City, Hanoi, Jakarta, Phnom Penh, Vientiane.
What is the UTC offset for ICT?
Indochina Time (ICT) is at UTC+07:00.
What should I know about the ICT timezone?
Bangkok is one of the most visited cities in the world. ICT is 12 hours ahead of EST.
When is it midnight in Sri Lanka, what time is it in Thailand?
When it is 12:00 AM (midnight) in Sri Lanka (IST), it is +1h 30m later in Thailand (ICT).
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