Does it account for Daylight Saving Time?

Yes, our converter uses the IANA timezone database, which includes all current DST rules for every timezone in the world.

UTC (Coordinated Universal Time) is the primary time standard by which the world regulates clocks. All timezones are defined as offsets from UTC.

Can I compare multiple timezones at once?

Yes, you can add multiple cities or timezones and see the equivalent times side by side.

How many timezones are there in the world?

There are 38 distinct UTC offsets in use, ranging from UTC-12 to UTC+14. This includes half-hour (UTC+5:30 India, UTC+9:30 Australia) and 45-minute offsets (UTC+5:45 Nepal, UTC+8:45 Australia).

What is the International Date Line?

The International Date Line (IDL) runs roughly along the 180° meridian in the Pacific Ocean. When you cross it westward, you gain a day; crossing eastward, you lose a day.

Why do some timezones have 30 or 45 minute offsets?

Countries chose offsets that best matched their solar noon. India uses UTC+5:30 and Nepal uses UTC+5:45 because standard hourly offsets didn't align well with their geography.

Which country has the most timezones?

France has the most (12 timezones) due to overseas territories. Russia spans 11 timezones. The US has 6 (including Hawaii and Alaska).

Sri Lanka to Bangladesh

+0h 30m

Sri Lanka

ISTSOURCE

UTC+05:30

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Bangladesh

BDST

UTC+06:00

HH12

MM30

12:30 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

Sri Lanka

Bangladesh

12:00 AM

12:30 AM

2:00 AM

2:30 AM

4:00 AM

4:30 AM

6:00 AM

6:30 AM

8:00 AM

8:30 AM

10:00 AM

10:30 AM

12:00 PM

12:30 PM

2:00 PM

2:30 PM

4:00 PM

4:30 PM

6:00 PM

6:30 PM

8:00 PM

8:30 PM

10:00 PM

10:30 PM

Green 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 Zone

→

BDST Zone

Explore all world timezones interactively →

IST – India Standard Time

UTC+05:30

India Standard Time (IST) is the time zone for India and Sri Lanka, 5 hours and 30 minutes ahead of UTC.

Countries in IST

IndiaSri Lanka

Major Cities in IST

MumbaiDelhiBangaloreKolkataChennaiHyderabadPuneAhmedabadColomboJaipurLucknowSurat

Key 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.
•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.

Daylight Saving:No – UTC+05:30 year-round

Learn more about IST on Wikipedia

BDST – Bangladesh Standard Time

UTC+06:00

Bangladesh Standard Time (BDST, UTC+06:00) is the time zone for Bangladesh, 6 hours ahead of UTC.

Countries in BDST

Bangladesh

Major Cities in BDST

DhakaChittagongKhulnaRajshahiSylhet

Key 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.
•Dhaka is one of the most densely populated cities globally.
•BDST is written here to distinguish it from British Summer Time (BST).

Daylight Saving:No – UTC+06:00 year-round

Learn more about BDST on Wikipedia

Sri Lanka to Bangladesh Time Difference – Complete Guide

Sri Lanka runs on India Standard Time (IST) at UTC+05:30. Bangladesh runs on Bangladesh Standard Time (BDST) at UTC+06:00. That puts Sri Lanka 30 minutes ahead of Bangladesh — a difference of +0h 30m at the current offsets.

In practice, when it is 9:00 AM in Sri Lanka it is 9:30 AM in Bangladesh. Midnight in Sri Lanka is 12:30 AM in Bangladesh. Neither zone observes daylight saving time, so the offset between them stays constant all year.

Sri Lanka to Bangladesh time conversion table

Sri Lanka (IST)	Bangladesh (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 Sri Lanka to Bangladesh time

Scheduling a call from Sri Lanka to Bangladesh: a 10:00 AM start in Sri Lanka lands at 10:30 AM in Bangladesh, so you can confirm the slot without doing the arithmetic yourself.
Finding shared working hours: both Sri Lanka and Bangladesh 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.
Keeping family and friends in sync: knowing that 8:00 PM in Sri Lanka is 8:30 PM in Bangladesh 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 +0h 30m gap is not.
Block 9:00 AM–4:30 PM IST as the recurring meeting window if you work primarily from Sri Lanka and need Bangladesh 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 Sri Lanka and Bangladesh

Both Sri Lanka and Bangladesh 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

Sri Lanka and Bangladesh share 7 hours of working-hours overlap (9:00 AM–4:30 PM IST), so scheduling a live meeting is straightforward.

Sri Lanka is 30 minutes ahead of Bangladesh (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:

⏳

History of Timekeeping

From sundials to atomic clocks - 5000 years of measuring time

🌍

How Time Zones Work

UTC, offsets, and why zones don't follow straight lines

☀️

Daylight Saving Time

DST dates, which countries observe it, and the ongoing debate

Frequently Asked Questions

What is the time difference between Sri Lanka and Bangladesh?

Sri Lanka (IST, UTC+05:30) is 30 minutes ahead of Bangladesh (BDST, UTC+06:00). The gap is currently +0h 30m.

How do I convert Sri Lanka time to Bangladesh time?

Add +0h 30m to Sri Lanka local time. For example, 9:00 AM in Sri Lanka is 9:30 AM in Bangladesh.

What time is it in Bangladesh right now?

Bangladesh 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 Sri Lanka.

What is the best time to call Bangladesh from Sri Lanka?

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, Sri Lanka or Bangladesh?

Sri Lanka is 30 minutes ahead of Bangladesh. When it is 12:00 PM in Sri Lanka it is 12:30 PM in Bangladesh.

Do Sri Lanka and Bangladesh use different time zones?

Sri Lanka (Sri Lanka) uses IST at UTC+05:30, while Bangladesh (Bangladesh) uses BDST at UTC+06:00. The IANA identifiers are Asia/Colombo and Asia/Dhaka.

Does daylight saving time affect the Sri Lanka–Bangladesh difference?

Neither zone observes daylight saving time, so the +0h 30m offset between Sri Lanka and Bangladesh 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 Bangladesh?

Not normally. The +0h 30m gap only pushes the date over for late-evening times.

What is the time difference between Sri Lanka and Bangladesh?

Bangladesh is +0h 30m from Sri Lanka.

What timezone is Sri Lanka in?

Sri Lanka operates on its local timezone.

What timezone is Bangladesh in?

Bangladesh 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 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.