Convert IRST to NPT
NPT is 2 hours 15 minutes ahead of IRST. IRST is UTC+3:30 and NPT is UTC+5:45.
Right now: IRST · NPT
Best time to schedule a meeting
Standard 9–5 working hours overlap for 6 hours: 9:00 AM–3:00 PM IRST (11:00 AM–5:00 PM NPT). Schedule meetings inside that window.
| IRST | NPT | Suitable? |
|---|---|---|
| 9:00 AM | 11:15 AM | working hours |
| 10:00 AM | 12:15 PM | working hours |
| 11:00 AM | 1:15 PM | working hours |
| 12:00 PM | 2:15 PM | working hours |
| 1:00 PM | 3:15 PM | working hours |
| 2:00 PM | 4:15 PM | working hours |
| 3:00 PM | 5:15 PM | outside 9–5 |
| 4:00 PM | 6:15 PM | outside 9–5 |
| 5:00 PM | 7:15 PM | outside 9–5 |
IRST to NPT conversion table
| IRST | NPT |
|---|---|
| 12:00 AM | 2:15 AM |
| 1:00 AM | 3:15 AM |
| 2:00 AM | 4:15 AM |
| 3:00 AM | 5:15 AM |
| 4:00 AM | 6:15 AM |
| 5:00 AM | 7:15 AM |
| 6:00 AM | 8:15 AM |
| 7:00 AM | 9:15 AM |
| 8:00 AM | 10:15 AM |
| 9:00 AM | 11:15 AM |
| 10:00 AM | 12:15 PM |
| 11:00 AM | 1:15 PM |
| 12:00 PM | 2:15 PM |
| 1:00 PM | 3:15 PM |
| 2:00 PM | 4:15 PM |
| 3:00 PM | 5:15 PM |
| 4:00 PM | 6:15 PM |
| 5:00 PM | 7:15 PM |
| 6:00 PM | 8:15 PM |
| 7:00 PM | 9:15 PM |
| 8:00 PM | 10:15 PM |
| 9:00 PM | 11:15 PM |
| 10:00 PM | 12:15 AM (next day) |
| 11:00 PM | 1:15 AM (next day) |
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 NPT
Nepal Time (NPT) is UTC+5:45. It is used in Nepal, all year.
Nepal Time is UTC+5:45 — the only zone in the world offset by three quarters of an hour, set so that noon falls over Kathmandu rather than over the Indian meridian fifteen minutes away. It breaks almost every piece of software that stores offsets in whole or half hours, and it is fifteen minutes ahead of India rather than the round number people assume.
Does this gap change with the seasons?
Neither IRST nor NPT shifts with the seasons, so this 2.25-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 NPT?
9:00 AM IRST is 11:15 AM NPT.
Is NPT ahead of IRST?
NPT is 2 hours 15 minutes ahead of IRST.
Which time zone does this use?
IRST is UTC+3:30 and NPT is UTC+5:45. 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.