Dhaka to Colombo
-0h 30mDhaka
BDSTSOURCEColombo
ISTGreen rows indicate typical business hours (9 AM - 5 PM)
BDST and IST on the World Map
The map below highlights the BDST (Bangladesh Standard Time) and IST (India Standard Time) timezone regions across the globe.
BDST – Bangladesh Standard Time
UTC+06:00Bangladesh Standard Time (BDST, UTC+06:00) is the time zone for Bangladesh, 6 hours ahead of UTC.
- •Bangladesh uses a single time zone, UTC+06:00, across the entire country.
- •Bangladesh does not observe daylight saving time, so the offset is fixed all year.
- •Dhaka is one of the most densely populated cities globally.
- •BDST is written here to distinguish it from British Summer Time (BST).
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 Dhaka
WikipediaDhaka operates on Bangladesh Standard Time (BST), UTC+6. As the world's second-largest garment hub, Dhaka time coordinates global fashion supply chains.
Bangladesh is the world's second-largest garment exporter after China.
About Colombo
WikipediaColombo operates on Sri Lanka Time (SLST), UTC+5:30. Sharing India's timezone, Colombo is a key South Asian trade and tourism hub.
Sri Lanka Standard Time (SLST) uses UTC+5:30, same offset as India.
Dhaka vs Colombo: Offsets, DST and Best Call Times
Dhaka runs on Bangladesh Standard Time (BDST) at UTC+06:00. Colombo runs on India Standard Time (IST) at UTC+05:30. That puts Dhaka 30 minutes behind Colombo — a difference of -0h 30m at the current offsets.
In practice, when it is 9:00 AM in Dhaka it is 8:30 AM in Colombo. Midnight in Dhaka is 11:30 PM in Colombo. Neither zone observes daylight saving time, so the offset between them stays constant all year.
Dhaka to Colombo time conversion table
| Dhaka (BDST) | Colombo (IST) | Day |
|---|---|---|
| 12:00 AM | 11:30 PM | previous day |
| 6:00 AM | 5:30 AM | same day |
| 7:00 AM | 6:30 AM | same day |
| 8:00 AM | 7:30 AM | same day |
| 9:00 AM | 8:30 AM | same day |
| 12:00 PM | 11:30 AM | same day |
| 3:00 PM | 2:30 PM | same day |
| 5:00 PM | 4:30 PM | same day |
| 6:00 PM | 5:30 PM | same day |
| 9:00 PM | 8:30 PM | same day |
Why people convert Dhaka to Colombo time
- Scheduling a call from Dhaka to Colombo: a 10:00 AM start in Dhaka lands at 9:30 AM in Colombo, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both Dhaka and Colombo are inside the 9-to-5 working day between 9:30 AM and 5:00 PM BDST time (9:00 AM–4:30 PM IST). That is roughly 7 hours 30 minutes of usable overlap.
- Keeping family and friends in sync: knowing that 8:00 PM in Dhaka is 7:30 PM in Colombo makes it easy to avoid calling at 3 AM.
- Always state the zone abbreviation, not just the hour. "3:00 PM BDST" is unambiguous; "3 PM" across a -0h 30m gap is not.
- Block 9:30 AM–5:00 PM BDST as the recurring meeting window if you work primarily from Dhaka and need Colombo colleagues present.
About BDST (Bangladesh Standard Time)
Bangladesh Standard Time (BDST) is the single time zone used across Bangladesh, fixed at UTC+06:00 all year. Bangladesh has not observed daylight saving time since a short-lived experiment in 2009, so the gap between Bangladesh and every other zone is constant. Dhaka, the capital, is one of the most densely populated cities in the world. Because the country sits close to the middle of the UTC+06:00 band, solar noon is near 12:00 for most of the year. BDST is listed separately from British Summer Time, which shares the BST abbreviation but is UTC+01:00.
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 Dhaka and Colombo
Both Dhaka and Colombo sit inside the 9 AM – 5 PM working day between 9:30 AM–5:00 PM BDST, which is 9:00 AM–4:30 PM IST. That gives roughly 7 hours and 30 minutes of shared time — the safest window for a live call or meeting.
Business hours overlap
Dhaka and Colombo share 7 hours of working-hours overlap (9:30 AM–5:00 PM BDST), so scheduling a live meeting is straightforward.
Dhaka is 30 minutes behind Colombo (BDST UTC+06:00 → IST UTC+05:30). The shared working window is 9:30 AM–5:00 PM BDST. 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 Dhaka and Colombo?
Dhaka (BDST, UTC+06:00) is 30 minutes behind Colombo (IST, UTC+05:30). The gap is currently -0h 30m.
How do I convert Dhaka time to Colombo time?
Add -0h 30m to Dhaka local time. For example, 9:00 AM in Dhaka is 8:30 AM in Colombo.
What time is it in Colombo right now?
Colombo 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 -0h 30m offset from Dhaka.
What is the best time to call Colombo from Dhaka?
Call between 9:30 AM and 5:00 PM BDST — that maps to 9:00 AM–4:30 PM IST and keeps both parties inside the working day.
Which is behind, Dhaka or Colombo?
Dhaka is 30 minutes behind Colombo. When it is 12:00 PM in Dhaka it is 11:30 AM in Colombo.
Do Dhaka and Colombo use different time zones?
Dhaka (Bangladesh) uses BDST at UTC+06:00, while Colombo (Sri Lanka) uses IST at UTC+05:30. The IANA identifiers are Asia/Dhaka and Asia/Colombo.
Does daylight saving time affect the Dhaka–Colombo difference?
Neither zone observes daylight saving time, so the -0h 30m offset between Dhaka and Colombo is fixed all year.
Which other cities share Dhaka's time zone?
BDST also covers Dhaka, Chittagong, Khulna, Rajshahi, Sylhet.
Which countries use BDST, Dhaka's zone?
BDST is used in Bangladesh.
Is there a day difference between Dhaka and Colombo?
Not normally. The -0h 30m gap only pushes the date over the previous day.
What is the time difference between Dhaka and Colombo?
Colombo is -0h 30m from Dhaka.
What timezone is Dhaka in?
Dhaka operates on Bangladesh Standard Time (BST), UTC+6. As the world's second-largest garment hub, Dhaka time coordinates global fashion supply chains.
What timezone is Colombo in?
Colombo operates on Sri Lanka Time (SLST), UTC+5:30. Sharing India's timezone, Colombo is a key South Asian trade and tourism hub.
What are the business hours in Dhaka?
Standard business hours in Dhaka are 9:00 AM - 5:00 PM BST.
What are the business hours in Colombo?
Standard business hours in Colombo are 9:00 AM - 5:00 PM IST.
What is the best time to schedule a call between Dhaka and Colombo?
The best overlap for a call is when both cities are in business hours. Dhaka works 9:00 AM - 5:00 PM BST and Colombo works 9:00 AM - 5:00 PM IST (-0h 30m difference). Try scheduling during the overlapping window for maximum convenience.
What currencies are used in Dhaka and Colombo?
Dhaka uses BDT (৳) while Colombo uses LKR (Rs). Check current exchange rates when planning travel or business between these cities.
How do Dhaka and Colombo compare in size?
Dhaka has a population of approximately 10.3 million (metro: 22.5 million), while Colombo has approximately 752,000 (metro: 5.6 million).
What are the major landmarks in Dhaka and Colombo?
Dhaka is known for Lalbagh Fort, Ahsan Manzil, National Parliament House. Colombo is famous for Galle Face Green, Gangaramaya Temple, Colombo Lotus Tower.
Do Dhaka and Colombo have stock exchanges?
Yes. Dhaka has the DSE (Dhaka Stock Exchange) and Colombo has the CSE (Colombo Stock Exchange). The -0h 30m time difference affects trading hour overlaps between these exchanges.
Which countries use BDST (Bangladesh Standard Time)?
BDST is used in Bangladesh.
Does BDST observe daylight saving time?
No, BDST does not observe daylight saving time and remains at UTC+06:00 year-round.
What are some interesting facts about BDST?
Bangladesh uses a single time zone, UTC+06:00, across the entire country. Bangladesh does not observe daylight saving time, so the offset is fixed all year.
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 Dhaka, what time is it in Colombo?
When it is 12:00 AM (midnight) in Dhaka (BDST), it is -0h 30m later in Colombo (IST).
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