Time zone converter
BST to IRST
Convert Bangladesh Time — Dhaka to Iran Time — Tehran — fast, accurate, and daylight-saving aware.
When it's 9:00 AM in Dhaka, it's 6:30 AM in Tehran. Tehran is 2½ hours behind Dhaka. Use the converter above to turn any BST time into IRST, or scan the hour-by-hour table below for the full day.
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Bangladesh Time — Dhaka ·
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Iran Time — Tehran ·
Convert a specific timein Dhaka → — in Tehran
BST to IRST at a glance
9:00 AM BST
6:30 AM
IRST · Tehran
12:00 PM BST
9:30 AM
IRST · Tehran
5:00 PM BST
2:30 PM
IRST · Tehran
Planning a meeting between Dhaka and Tehran
Planning a call between Dhaka and Tehran? The best overlap during a standard 9-to-5 workday runs 11:30 AM–5:00 PM BST (9:00 AM–2:30 PM IRST). Aim for that window to reach both sides during business hours.
Hour-by-hour: Dhaka to Tehran
A full day mapped from BST to IRST.
Frequently asked
Is Tehran ahead of or behind Dhaka?
Tehran is 2½ hours behind Dhaka.
What is 12:00 PM BST in IRST?
12:00 PM in Dhaka is 9:30 AM in Tehran.
Does this converter account for daylight saving time?
Yes. Conversions use the IANA time zone database, so BST and IRST automatically reflect the correct daylight-saving offset for the current date.