Bangkok to Colombo Time
ICT to IST Converter — 9 AM ICT is 7:30 AM IST
Bangkok is 1 hours and 30 minutes ahead of Colombo. Convert any time between Bangkok (ICT) and Colombo (IST) instantly.
Bangkok
Thailand
Colombo
Sri Lanka
Add Time Zones to Compare
Time Zone Comparison
Bangkok to Colombo Time Conversion Table
| Bangkok (ICT) | Colombo (IST) |
|---|---|
| 12:00 AM | 10:30 PM |
| 2:00 AM | 12:30 AM |
| 4:00 AM | 2:30 AM |
| 6:00 AM | 4:30 AM |
| 8:00 AM | 6:30 AM |
| 10:00 AM | 8:30 AM |
| 12:00 PM | 10:30 AM |
| 2:00 PM | 12:30 PM |
| 4:00 PM | 2:30 PM |
| 6:00 PM | 4:30 PM |
| 8:00 PM | 6:30 PM |
| 10:00 PM | 8:30 PM |
Bangkok & Colombo — Business & Scheduling Guide
Bangkok (Thailand) is a major manufacturing and tourism hub in Southeast Asia, with key industries in automotive assembly, electronics, tourism, and agriculture. Colombo (Sri Lanka) is a South Asian island economy with strategic Indian Ocean positioning, known for tourism, tea, apparel, and IT/BPO services. With a 1.5-hour time difference, professionals frequently schedule cross-border calls between these two cities for international trade, remote team collaboration, and client meetings.
Scheduling Meetings Between Bangkok and Colombo
With only a 1.5-hour gap, Bangkok and Colombo have generous overlapping work hours. Morning calls in the earlier time zone align well with mid-day in the other. Thai business hours are typically 8:30 AM–5:30 PM, with a culture that values harmony and respect in professional settings. Sri Lankan business hours are typically 8:30 AM–5 PM, with a growing technology outsourcing sector. Most teams find that late morning to early afternoon offers the widest window for collaboration.
Daylight Saving Time Considerations
Neither Bangkok nor Colombo observes Daylight Saving Time — Bangkok stays on ICT and Colombo stays on IST year-round. This makes scheduling between these two cities simpler, as the 1.5-hour time difference remains constant throughout the year with no DST surprises.
Collaboration Tools & Workflow
Teams working between Bangkok and Colombo enjoy strong real-time collaboration potential. With just a 1.5-hour time difference, daily standups, pair programming, and spontaneous video calls are all practical. Popular tools for Bangkok–Colombo teams include Slack for real-time messaging, Google Meet or Zoom for video calls, and Notion or Linear for project management. The overlapping work window is wide enough that most teams can operate nearly synchronously.
Remote Work Between Bangkok & Colombo
Bangkok, a key city in Thailand, and Colombo, a key city in Sri Lanka, are well-connected for remote work. With a manageable 1.5-hour time difference, distributed teams can maintain a near-synchronous workflow. Both cities have strong internet infrastructure, coworking spaces, and established remote work cultures. For freelancers and remote workers, this time zone pairing is ideal — you can serve clients in Colombo from Bangkok (or vice versa) without disrupting your standard workday.
ICT to IST — Quick Reference
ICT (ICT) stands for the timezone used in Bangkok, Thailand (UTC+7). IST (IST) is the timezone used in Colombo, Sri Lanka (UTC+5:30). Bangkok is 1 hours and 30 minutes ahead of Colombo.
To convert ICT to IST, subtract 1.5 hours from ICT time. For example, ICT 9:00 AM = IST 7:30 AM.
Key Facts
- •Time difference: Bangkok (UTC+7) is 1 hours and 30 minutes ahead of Colombo (UTC+5:30).
- •Daylight Saving Time: Bangkok does not observe DST (ICT). Colombo does not observe DST (IST).
- •Regions: Bangkok is located in Thailand and uses the ICT time zone. Colombo is located in Sri Lanka and uses the IST time zone.
- •Best time to call: The best time to call between Bangkok and Colombo is 11:00 AM to 4:00 PM in Bangkok time, when both cities have overlapping standard working hours.
Frequently Asked Questions
What is the time difference between Bangkok and Colombo?
Bangkok is 1 hours and 30 minutes ahead of Colombo.
What time is it in Colombo when it's 9 AM in Bangkok?
When it's 9:00 AM in Bangkok, it is 7:30 AM in Colombo.
What time is 9 PM ICT in IST?
9 PM ICT (Bangkok time) is 7:30 PM IST (Colombo time). This is a common time people check when scheduling evening calls across these two time zones.
When is the best time to schedule a meeting between Bangkok and Colombo?
The best time to schedule a meeting is between 11:00 AM to 4:00 PM in Bangkok time, when both cities are within standard working hours (9 AM – 5 PM). This gives you the maximum overlap window for real-time collaboration.
How do I convert ICT to IST?
ICT (ICT) is the timezone for Bangkok, Thailand (UTC+7). IST (IST) is the timezone for Colombo, Sri Lanka (UTC+5:30). Bangkok is 1 hours and 30 minutes ahead of Colombo. Quick examples: 9 AM ICT = 7:30 AM IST, 12 PM ICT = 10:30 AM IST, 3 PM ICT = 1:30 PM IST, 6 PM ICT = 4:30 PM IST.
Is Bangkok ahead of or behind Colombo?
Bangkok is 1 hour 30 minutes ahead of Colombo. When it's noon in Bangkok, it's 10:30 AM in Colombo.
Does Bangkok or Colombo change clocks for Daylight Saving Time?
No, Bangkok does not observe DST — it stays on ICT year-round. Colombo does not observe DST — it stays on IST year-round.
What time is noon in Bangkok in Colombo time?
When it is 12:00 PM (noon) in Bangkok (ICT), it is 10:30 AM in Colombo (IST). This is often a popular time for scheduling lunch-hour calls across the Bangkok–Colombo corridor.
What are the overlapping work hours between Bangkok and Colombo?
The overlapping work hours between Bangkok and Colombo are approximately 11:00 AM to 4:00 PM in Bangkok time, when both cities are within the standard 9 AM–5 PM workday. This is the ideal window for meetings, pair programming, and real-time collaboration.
What timezone is Bangkok in?
Bangkok is in the ICT time zone (UTC+7). It is located in Thailand. Bangkok does not observe Daylight Saving Time.
What timezone is Colombo in?
Colombo is in the IST time zone (UTC+5:30). It is located in Sri Lanka. Colombo does not observe Daylight Saving Time.
How do I schedule a call between Bangkok and Colombo?
To schedule a call between Bangkok and Colombo, aim for the overlapping window of 11:00 AM to 4:00 PM in Bangkok time. Use Google Calendar or Calendly with both time zones visible, share the meeting invite with the IST time clearly noted, and always double-check the time difference — especially during DST transitions. Pro tip: include both local times in the calendar invite title (e.g., "Sync — 10 AM ICT / 8:30 AM IST").
Related Time Zone Conversions
More from Bangkok
Convert to Colombo
Working across time zones?
Auto-sync calendar events into your timesheet — no matter what time zone your team is in. Connect Google Calendar, Teams, or Zoom and export a polished timesheet in seconds.
No credit card required. Free forever plan available.