Time zone converter
IRST to AST
Convert Iran Time — Tehran to Arabia Time — Riyadh — fast, accurate, and daylight-saving aware.
When it's 9:00 AM in Tehran, it's 8:30 AM in Riyadh. Riyadh is 0½ hours behind Tehran. Use the converter above to turn any IRST time into AST, or scan the hour-by-hour table below for the full day.
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Iran Time — Tehran ·
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Arabia Time — Riyadh ·
Convert a specific timein Tehran → — in Riyadh
IRST to AST at a glance
9:00 AM IRST
8:30 AM
AST · Riyadh
12:00 PM IRST
11:30 AM
AST · Riyadh
5:00 PM IRST
4:30 PM
AST · Riyadh
Planning a meeting between Tehran and Riyadh
Planning a call between Tehran and Riyadh? The best overlap during a standard 9-to-5 workday runs 9:30 AM–5:00 PM IRST (9:00 AM–4:30 PM AST). Aim for that window to reach both sides during business hours.
Hour-by-hour: Tehran to Riyadh
A full day mapped from IRST to AST.
Frequently asked
Is Riyadh ahead of or behind Tehran?
Riyadh is 0½ hours behind Tehran.
What is 12:00 PM IRST in AST?
12:00 PM in Tehran is 11:30 AM in Riyadh.
Does this converter account for daylight saving time?
Yes. Conversions use the IANA time zone database, so IRST and AST automatically reflect the correct daylight-saving offset for the current date.