Convert IRST to SAST
SAST is 1 hour 30 minutes behind IRST. IRST is UTC+3:30 and SAST is UTC+2.
Right now: IRST · SAST
Best time to schedule a meeting
Standard 9–5 working hours overlap for 6 hours: 11:00 AM–5:00 PM IRST (9:00 AM–3:00 PM SAST). Schedule meetings inside that window.
| IRST | SAST | Suitable? |
|---|---|---|
| 9:00 AM | 7:30 AM | outside 9–5 |
| 10:00 AM | 8:30 AM | outside 9–5 |
| 11:00 AM | 9:30 AM | working hours |
| 12:00 PM | 10:30 AM | working hours |
| 1:00 PM | 11:30 AM | working hours |
| 2:00 PM | 12:30 PM | working hours |
| 3:00 PM | 1:30 PM | working hours |
| 4:00 PM | 2:30 PM | working hours |
| 5:00 PM | 3:30 PM | working hours |
IRST to SAST conversion table
| IRST | SAST |
|---|---|
| 12:00 AM | 10:30 PM (previous day) |
| 1:00 AM | 11:30 PM (previous day) |
| 2:00 AM | 12:30 AM |
| 3:00 AM | 1:30 AM |
| 4:00 AM | 2:30 AM |
| 5:00 AM | 3:30 AM |
| 6:00 AM | 4:30 AM |
| 7:00 AM | 5:30 AM |
| 8:00 AM | 6:30 AM |
| 9:00 AM | 7:30 AM |
| 10:00 AM | 8:30 AM |
| 11:00 AM | 9:30 AM |
| 12:00 PM | 10:30 AM |
| 1:00 PM | 11:30 AM |
| 2:00 PM | 12:30 PM |
| 3:00 PM | 1:30 PM |
| 4:00 PM | 2:30 PM |
| 5:00 PM | 3:30 PM |
| 6:00 PM | 4:30 PM |
| 7:00 PM | 5:30 PM |
| 8:00 PM | 6:30 PM |
| 9:00 PM | 7:30 PM |
| 10:00 PM | 8:30 PM |
| 11:00 PM | 9:30 PM |
About IRST
Iran Standard Time (IRST) is UTC+3:30. It is used in Iran, all year.
Iran Standard Time is UTC+3:30. Iran ran daylight saving for decades and stopped in 2022, so material written before then puts the country half an hour further ahead in summer and is now wrong. Half-hour offsets are rare enough that scheduling tools sometimes round them, which turns a correct calculation into a thirty-minute error.
About SAST
South Africa Standard Time (SAST) is UTC+2. It is used in South Africa, Lesotho and Eswatini.
South Africa Standard Time is UTC+2 with no daylight saving, unchanged since 1903 apart from two wartime years. The whole country keeps it, and so do Lesotho and Eswatini. Against the UK it is two hours ahead in winter and one in summer, which is the shift that catches London–Johannesburg standing calls every March and October.
Does this gap change with the seasons?
Neither IRST nor SAST shifts with the seasons, so this 1.5-hour difference holds all year. That is unusual enough to be worth relying on: most cross-continental gaps move twice a year.
This is the reason scheduling systems store an IANA zone such as Region/City rather than an offset or an abbreviation: the zone knows its own rules and the offset does not.
Frequently asked questions
What time is 9:00 AM IRST in SAST?
9:00 AM IRST is 7:30 AM SAST.
Is SAST ahead of IRST?
SAST is 1 hour 30 minutes behind IRST.
Which time zone does this use?
IRST is UTC+3:30 and SAST is UTC+2. Both abbreviations denote a single fixed offset, so this conversion never shifts with daylight saving — what changes is which abbreviation a place is using at the time.