IRST to BST Time Converter
Use this IRST to BST time converter to compare Iran and United Kingdom time instantly. BST is 2 hours and 30 minutes behind IRST, so 9:00 AM IRST becomes 6:30 AM BST and 5:00 PM IRST becomes 2:30 PM BST. The page is useful for business-hours overlap, international calls, remote-team handoffs, webinars, and travel planning, with daylight saving adjustments handled automatically.
IRST to BST Quick Facts
Use this IRST to BST converter to compare Iran and United Kingdom time, check the 2 hours and 30 minutes gap, and confirm the right slot for calls, handoffs, and deadlines. Good overlap starts around 12:00 PM IRST / 9:30 AM BST.
How to Convert IRST to BST
Converting between Iran Standard Time and British Summer Time means accounting for a 2 hours and 30 minutes gap — here's how to do it in under 10 seconds with no sign-up.
Pick the date and time in Iran Standard Time (UTC +3:30) that you want to convert. Hit "Now" to load the current IRST time instantly, or use "+1h" to step forward and compare.
The equivalent British Summer Time (UTC +1) time appears immediately. Since BST is 2 hours and 30 minutes behind of IRST, most daytime conversions stay on the same calendar day.
Click "Copy Time" to grab the BST result for your calendar or message. Use "+1d" to check how the conversion shifts across dates — useful when Daylight Saving Time changes the gap.
Why Choose Our IRST to BST Converter
When someone in Iran suggests 12:00 PM IRST, that's 9:30 AM BST. This converter shows the overlap so both sides agree on one slot — no back-and-forth.
Late-night IRST times can land on a different date in BST because of the 2 hours and 30 minutes offset. The converter labels "next day" or "previous day" next to the result so you never send a message a day early or miss a deadline.
The half-hour offset between IRST (UTC +3:30) and BST (UTC +1) already makes mental math tricky — add Daylight Saving Time and the gap can shift further. This converter uses live UTC offsets, so you're always accurate.
Product launches, sports matches, and webinars are often announced in IRST. Convert the event time to BST so you know exactly when to tune in — with a 2 hours and 30 minutes difference, a morning event in Iran falls during work hours in United Kingdom.
IRST to BST Time Conversion Chart
Quick-reference conversion table covering every hour of the day at a glance.
Iran Standard Time to British Summer Time full day schedule
| Iran Standard Time | British Summer Time |
|---|---|
| 12:00 AM |
9:30 PM
(previous day)
|
| 1:00 AM |
10:30 PM
(previous day)
|
| 2:00 AM |
11:30 PM
(previous day)
|
| 3:00 AM |
12:30 AM
|
| 4:00 AM |
1:30 AM
|
| 5:00 AM |
2:30 AM
|
| 6:00 AM |
3:30 AM
|
| 7:00 AM |
4:30 AM
|
| 8:00 AM |
5:30 AM
|
| 9:00 AM |
6:30 AM
|
| 10:00 AM |
7:30 AM
|
| 11:00 AM |
8:30 AM
|
| 12:00 PM |
9:30 AM
|
| 1:00 PM |
10:30 AM
|
| 2:00 PM |
11:30 AM
|
| 3:00 PM |
12:30 PM
|
| 4:00 PM |
1:30 PM
|
| 5:00 PM |
2:30 PM
|
| 6:00 PM |
3:30 PM
|
| 7:00 PM |
4:30 PM
|
| 8:00 PM |
5:30 PM
|
| 9:00 PM |
6:30 PM
|
| 10:00 PM |
7:30 PM
|
| 11:00 PM |
8:30 PM
|
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