Does it handle Daylight Saving Time?

Yes, the tool automatically adjusts for Daylight Saving Time based on the specific date you select, ensuring accurate conversions year-round.

Can I add multiple cities?

Yes, you can add as many cities as you need to the dashboard to compare times across your entire global network simultaneously.

Tehran to BDST

+2h 30m

Tehran

IRSTSOURCE

Iran · UTC+03:30

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

BDST

UTC+06:00

HH02

MM30

14:30 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

Tehran

BDST

12:00 AM

2:30 AM

2:00 AM

4:30 AM

4:00 AM

6:30 AM

6:00 AM

8:30 AM

8:00 AM

10:30 AM

10:00 AM

12:30 PM

12:00 PM

2:30 PM

2:00 PM

4:30 PM

4:00 PM

6:30 PM

6:00 PM

8:30 PM

8:00 PM

10:30 PM

10:00 PM

12:30 AM+1

Green rows indicate typical business hours (9 AM - 5 PM)

IRST and BDST on the World Map

The map below highlights the IRST (Iran Standard Time) and BDST (Bangladesh Standard Time) timezone regions across the globe.

IRST Zone

→

BDST Zone

Explore all world timezones interactively →

IRST – Iran Standard Time

UTC+03:30

Iran Standard Time (IRST) is the time zone for Iran, 3 hours and 30 minutes ahead of UTC.

Countries in IRST

Iran

Major Cities in IRST

TehranIsfahanMashhadTabrizShirazKaraj

Key Facts about IRST

•IRST is one of only a few time zones with a 30-minute offset.
•Iran observes daylight saving time, switching to IRDT (UTC+04:30).
•Tehran has a metropolitan population of over 16 million.

Daylight Saving:Yes – switches to IRDT

Learn more about IRST 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

About Tehran

Wikipedia

Tehran operates on Iran Standard Time (IRST), UTC+3:30. Iran's unique half-hour offset makes Tehran time distinctive for regional business coordination.

Population:9.4 million

Metro:16.8 million

Business Hours:8:00 AM - 4:00 PM IRST

Currency:IRR (﷼)

Stock Exchange:TSE (Tehran Stock Exchange)

Key Landmarks

Azadi TowerGolestan PalaceGrand BazaarMilad TowerTabiat Bridge

Did You Know?

Iran Standard Time (IRST) is one of few timezones with a 30-minute offset (UTC+3:30).

Learn more about IRST timezone →

Everything You Need to Know About Tehran and BDST Time

Tehran runs on Iran Standard Time (IRST) at UTC+03:30. BDST runs on Bangladesh Standard Time (BDST) at UTC+06:00. That puts Tehran 2 hours 30 minutes ahead of BDST — a difference of +2h 30m at the current offsets.

In practice, when it is 9:00 AM in Tehran it is 11:30 AM in BDST. Midnight in Tehran is 2:30 AM in BDST. Neither zone observes daylight saving time, so the offset between them stays constant all year.

Tehran to BDST time conversion table

Tehran (IRST)	BDST (BDST)	Day
12:00 AM	2:30 AM	same day
6:00 AM	8:30 AM	same day
7:00 AM	9:30 AM	same day
8:00 AM	10:30 AM	same day
9:00 AM	11:30 AM	same day
12:00 PM	2:30 PM	same day
3:00 PM	5:30 PM	same day
5:00 PM	7:30 PM	same day
6:00 PM	8:30 PM	same day
9:00 PM	11:30 PM	same day

Why people convert Tehran to BDST time

Scheduling a call from Tehran to BDST: a 10:00 AM start in Tehran lands at 12:30 PM in BDST, so you can confirm the slot without doing the arithmetic yourself.
Finding shared working hours: both Tehran and BDST are inside the 9-to-5 working day between 9:00 AM and 2:30 PM IRST time (11:30 AM–5:00 PM BDST). That is roughly 5 hours 30 minutes of usable overlap.
Coordinating a Tehran-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 IRST" is unambiguous; "3 PM" across a +2h 30m gap is not.
Block 9:00 AM–2:30 PM IRST as the recurring meeting window if you work primarily from Tehran and need BDST colleagues present.

About IRST (Iran Standard Time)

Iran Standard Time (IRST) is one of the few time zones with a 30-minute offset. Iran observes daylight saving time (IRDT, UTC+04:30) from late March to late September. Tehran, the capital, is one of the largest cities in the Middle East.

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 Tehran and BDST

Both Tehran and BDST sit inside the 9 AM – 5 PM working day between 9:00 AM–2:30 PM IRST, which is 11:30 AM–5:00 PM BDST. That gives roughly 5 hours and 30 minutes of shared time — the safest window for a live call or meeting.

Business hours overlap

Tehran and BDST share 5 hours of working-hours overlap (9:00 AM–2:30 PM IRST), so scheduling a live meeting is straightforward.

Tehran is 2 hours 30 minutes ahead of BDST (IRST UTC+03:30 → BDST UTC+06:00). The shared working window is 9:00 AM–2:30 PM IRST. 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 Tehran and BDST?

Tehran (IRST, UTC+03:30) is 2 hours 30 minutes ahead of BDST (BDST, UTC+06:00). The gap is currently +2h 30m.

How do I convert Tehran time to BDST time?

Add +2h 30m to Tehran local time. For example, 9:00 AM in Tehran is 11:30 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 +2h 30m offset from Tehran.

What is the best time to call BDST from Tehran?

Call between 9:00 AM and 2:30 PM IRST — that maps to 11:30 AM–5:00 PM BDST and keeps both parties inside the working day.

Which is ahead, Tehran or BDST?

Tehran is 2 hours 30 minutes ahead of BDST. When it is 12:00 PM in Tehran it is 2:30 PM in BDST.

Do Tehran and BDST use different time zones?

Tehran (Iran) uses IRST at UTC+03:30, while BDST uses BDST at UTC+06:00. The IANA identifiers are Asia/Tehran and Asia/Dhaka.

Does daylight saving time affect the Tehran–BDST difference?

Neither zone observes daylight saving time, so the +2h 30m offset between Tehran and BDST is fixed all year.

Which other cities share Tehran's time zone?

IRST also covers Tehran, Isfahan, Mashhad, Tabriz, Shiraz, Karaj.

Which countries use IRST, Tehran's zone?

IRST is used in Iran.

Is there a day difference between Tehran and BDST?

Not normally. The +2h 30m gap only pushes the date over for late-evening times.

What is the time difference between Tehran and BDST?

BDST is +2h 30m from Tehran.

What timezone is Tehran in?

Tehran operates on Iran Standard Time (IRST), UTC+3:30. Iran's unique half-hour offset makes Tehran time distinctive for regional business coordination.

What timezone is BDST in?

BDST operates on its local timezone.

What are the business hours in Tehran?

Standard business hours in Tehran are 8:00 AM - 4:00 PM IRST.

Which countries use IRST (Iran Standard Time)?

IRST is used in Iran.

Does IRST observe daylight saving time?

Yes, IRST switches to IRDT during summer months.

What are some interesting facts about IRST?

IRST is one of only a few time zones with a 30-minute offset. Iran observes daylight saving time, switching to IRDT (UTC+04:30).

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.