Colombo to BDST
+0h 30mColombo
ISTSOURCEBDST
BDSTGreen rows indicate typical business hours (9 AM - 5 PM)
IST and BDST on the World Map
The map below highlights the IST (India Standard Time) and BDST (Bangladesh 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.
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).
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.
Understanding the +0h 30m Gap: Colombo vs BDST
Colombo runs on India Standard Time (IST) at UTC+05:30. BDST runs on Bangladesh Standard Time (BDST) at UTC+06:00. That puts Colombo 30 minutes ahead of BDST — a difference of +0h 30m at the current offsets.
In practice, when it is 9:00 AM in Colombo it is 9:30 AM in BDST. Midnight in Colombo is 12:30 AM in BDST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
Colombo to BDST time conversion table
| Colombo (IST) | BDST (BDST) | Day |
|---|---|---|
| 12:00 AM | 12:30 AM | same day |
| 6:00 AM | 6:30 AM | same day |
| 7:00 AM | 7:30 AM | same day |
| 8:00 AM | 8:30 AM | same day |
| 9:00 AM | 9:30 AM | same day |
| 12:00 PM | 12:30 PM | same day |
| 3:00 PM | 3:30 PM | same day |
| 5:00 PM | 5:30 PM | same day |
| 6:00 PM | 6:30 PM | same day |
| 9:00 PM | 9:30 PM | same day |
Why people convert Colombo to BDST time
- Scheduling a call from Colombo to BDST: a 10:00 AM start in Colombo lands at 10:30 AM in BDST, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both Colombo and BDST are inside the 9-to-5 working day between 9:00 AM and 4:30 PM IST time (9:30 AM–5:00 PM BDST). That is roughly 7 hours 30 minutes of usable overlap.
- Coordinating a Colombo-based team with BDST contacts: quoting times in the other side's local clock — not your own — removes the single biggest source of missed meetings.
- Always state the zone abbreviation, not just the hour. "3:00 PM IST" is unambiguous; "3 PM" across a +0h 30m gap is not.
- Block 9:00 AM–4:30 PM IST as the recurring meeting window if you work primarily from Colombo and need BDST 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 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.
Best time to call between Colombo and BDST
Both Colombo and BDST sit inside the 9 AM – 5 PM working day between 9:00 AM–4:30 PM IST, which is 9:30 AM–5:00 PM BDST. That gives roughly 7 hours and 30 minutes of shared time — the safest window for a live call or meeting.
Business hours overlap
Colombo and BDST share 7 hours of working-hours overlap (9:00 AM–4:30 PM IST), so scheduling a live meeting is straightforward.
Colombo is 30 minutes ahead of BDST (IST UTC+05:30 → BDST UTC+06:00). The shared working window is 9:00 AM–4:30 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 Colombo and BDST?
Colombo (IST, UTC+05:30) is 30 minutes ahead of BDST (BDST, UTC+06:00). The gap is currently +0h 30m.
How do I convert Colombo time to BDST time?
Add +0h 30m to Colombo local time. For example, 9:00 AM in Colombo is 9:30 AM in BDST.
What time is it in BDST right now?
BDST uses BDST at UTC+06:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +0h 30m offset from Colombo.
What is the best time to call BDST from Colombo?
Call between 9:00 AM and 4:30 PM IST — that maps to 9:30 AM–5:00 PM BDST and keeps both parties inside the working day.
Which is ahead, Colombo or BDST?
Colombo is 30 minutes ahead of BDST. When it is 12:00 PM in Colombo it is 12:30 PM in BDST.
Do Colombo and BDST use different time zones?
Colombo (Sri Lanka) uses IST at UTC+05:30, while BDST uses BDST at UTC+06:00. The IANA identifiers are Asia/Colombo and Asia/Dhaka.
Does daylight saving time affect the Colombo–BDST difference?
Neither zone observes daylight saving time, so the +0h 30m offset between Colombo and BDST is fixed all year.
Which other cities share Colombo's time zone?
IST also covers Mumbai, Delhi, Bangalore, Kolkata, Chennai, Hyderabad, Pune, Ahmedabad and 4 more.
Which countries use IST, Colombo's zone?
IST is used in India, Sri Lanka.
Is there a day difference between Colombo and BDST?
Not normally. The +0h 30m gap only pushes the date over for late-evening times.
What is the time difference between Colombo and BDST?
BDST is +0h 30m from Colombo.
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 timezone is BDST in?
BDST operates on its local timezone.
What are the business hours in Colombo?
Standard business hours in Colombo are 9:00 AM - 5:00 PM IST.
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 BDST timezone?
Major cities in the BDST timezone include Dhaka, Chittagong, Khulna, Rajshahi, Sylhet.
What is the UTC offset for BDST?
Bangladesh Standard Time (BDST) is at UTC+06:00.
What should I know about the BDST timezone?
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.
When is it midnight in Colombo, what time is it in BDST?
When it is 12:00 AM (midnight) in Colombo (IST), it is +0h 30m later in BDST (BDST).
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