IRST to Portugal
-2h 30mIRST
IRSTSOURCEPortugal
WESTGreen rows indicate typical business hours (9 AM - 5 PM)
IRST and WEST on the World Map
The map below highlights the IRST (Iran Standard Time) and WEST (Western European Time) timezone regions across the globe.
IRST – Iran Standard Time
UTC+03:30Iran Standard Time (IRST) is the time zone for Iran, 3 hours and 30 minutes ahead of UTC.
- •IRST is one of only a few time zones with a 30-minute offset.
- •Iran observes daylight saving time, switching to IRDT (UTC+04:30).
- •Tehran has a metropolitan population of over 16 million.
WET – Western European Time
UTC+00:00Western European Time (WET) is the time zone for Portugal, Morocco, and the Canary Islands, same as UTC+00:00.
- •Portugal is the only mainland European country in the WET time zone.
- •The Canary Islands are on WET despite being part of Spain (which uses CET).
- •WET is identical to GMT and UTC+00:00.
Understanding the -2h 30m Gap: IRST vs Portugal
IRST runs on Iran Standard Time (IRST) at UTC+03:30. Portugal runs on Western European Summer Time (WEST) at UTC+01:00, also currently on daylight saving time. That puts IRST 2 hours 30 minutes behind Portugal — a difference of -2h 30m at the current offsets.
In practice, when it is 9:00 AM in IRST it is 6:30 AM in Portugal. Midnight in IRST is 9:30 PM in Portugal.Portugal observes daylight saving time while IRST does not, so the gap narrows or widens by an hour part of the year.
IRST to Portugal time conversion table
| IRST (IRST) | Portugal (WEST) | Day |
|---|---|---|
| 12:00 AM | 9:30 PM | previous day |
| 6:00 AM | 3:30 AM | same day |
| 7:00 AM | 4:30 AM | same day |
| 8:00 AM | 5:30 AM | same day |
| 9:00 AM | 6:30 AM | same day |
| 12:00 PM | 9:30 AM | same day |
| 3:00 PM | 12:30 PM | same day |
| 5:00 PM | 2:30 PM | same day |
| 6:00 PM | 3:30 PM | same day |
| 9:00 PM | 6:30 PM | same day |
Why people convert IRST to Portugal time
- Scheduling a call from IRST to Portugal: a 10:00 AM start in IRST lands at 7:30 AM in Portugal, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both IRST and Portugal are inside the 9-to-5 working day between 11:30 AM and 5:00 PM IRST time (9:00 AM–2:30 PM WEST). That is roughly 5 hours 30 minutes of usable overlap.
- Coordinating a IRST-based team with Portugal contacts: quoting times in the other side's local clock — not your own — removes the single biggest source of missed meetings.
- Always state the zone abbreviation, not just the hour. "3:00 PM IRST" is unambiguous; "3 PM" across a -2h 30m gap is not.
- Block 11:30 AM–5:00 PM IRST as the recurring meeting window if you work primarily from IRST and need Portugal colleagues present.
- Portugal: Clocks fall back on Sun, Oct 25, 2026. Any meeting series spanning that date will shift by an hour in local time.
About IRST (Iran Standard Time)
Iran Standard Time (IRST) is one of the few time zones with a 30-minute offset. Iran observes daylight saving time (IRDT, UTC+04:30) from late March to late September. Tehran, the capital, is one of the largest cities in the Middle East.
About WET (Western European Time)
Western European Time (WET) is used in Portugal, the Canary Islands (Spain), Morocco, and several other locations. It is equivalent to GMT/UTC. During summer, Portugal and the Canary Islands switch to WEST (Western European Summer Time, UTC+01:00).
Best time to call between IRST and Portugal
Both IRST and Portugal sit inside the 9 AM – 5 PM working day between 11:30 AM–5:00 PM IRST, which is 9:00 AM–2:30 PM WEST. That gives roughly 5 hours and 30 minutes of shared time — the safest window for a live call or meeting.
Business hours overlap
IRST and Portugal share 5 hours of working-hours overlap (11:30 AM–5:00 PM IRST), so scheduling a live meeting is straightforward.
IRST is 2 hours 30 minutes behind Portugal (IRST UTC+03:30 → WEST UTC+01:00). The shared working window is 11:30 AM–5:00 PM IRST. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
IRST
Does not observe DST
Portugal
☀ Currently in DST
Standard: UTC+00:00 · DST: UTC+01:00
Clocks fall back on Sun, Oct 25, 2026
Learn More About Time
Dive deeper into the fascinating world of timekeeping, time zones, and how they shape our global society:
Frequently Asked Questions
What is the time difference between IRST and Portugal?
IRST (IRST, UTC+03:30) is 2 hours 30 minutes behind Portugal (WEST, UTC+01:00). The gap is currently -2h 30m.
How do I convert IRST time to Portugal time?
Add -2h 30m to IRST local time. For example, 9:00 AM in IRST is 6:30 AM in Portugal.
What time is it in Portugal right now?
Portugal uses WEST at UTC+01:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -2h 30m offset from IRST.
What is the best time to call Portugal from IRST?
Call between 11:30 AM and 5:00 PM IRST — that maps to 9:00 AM–2:30 PM WEST and keeps both parties inside the working day.
Which is behind, IRST or Portugal?
IRST is 2 hours 30 minutes behind Portugal. When it is 12:00 PM in IRST it is 9:30 AM in Portugal.
Do IRST and Portugal use different time zones?
IRST uses IRST at UTC+03:30, while Portugal (Portugal) uses WEST at UTC+01:00. The IANA identifiers are Asia/Tehran and Europe/Lisbon.
Does daylight saving time affect the IRST–Portugal difference?
Yes at the moment: Portugal is on daylight saving time and IRST is not, so the -2h 30m gap shifts by an hour when exactly one of them changes clocks.
Which other cities share IRST's time zone?
IRST also covers Tehran, Isfahan, Mashhad, Tabriz, Shiraz, Karaj.
Which countries use IRST, IRST's zone?
IRST is used in Iran.
Is there a day difference between IRST and Portugal?
Not normally. The -2h 30m gap only pushes the date over the previous day.
What is the time difference between IRST and Portugal?
Portugal is -2h 30m from IRST.
What timezone is IRST in?
IRST operates on its local timezone.
What timezone is Portugal in?
Portugal operates on its local timezone.
Which countries use IRST (Iran Standard Time)?
IRST is used in Iran.
Does IRST observe daylight saving time?
Yes, IRST switches to IRDT during summer months.
What are some interesting facts about IRST?
IRST is one of only a few time zones with a 30-minute offset. Iran observes daylight saving time, switching to IRDT (UTC+04:30).
Which cities are in the WET timezone?
Major cities in the WET timezone include Lisbon, Porto, Casablanca, Las Palmas, Funchal, Rabat.
What is the UTC offset for WET?
Western European Time (WET) is at UTC+00:00. During daylight saving time, it shifts to WEST.
What should I know about the WET timezone?
Portugal is the only mainland European country in the WET time zone. The Canary Islands are on WET despite being part of Spain (which uses CET).
When is it midnight in IRST, what time is it in Portugal?
When it is 12:00 AM (midnight) in IRST (IRST), it is -2h 30m later in Portugal (WET).
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