IRST to Manila
+4h 30mIRST
IRSTSOURCEManila
PHTGreen rows indicate typical business hours (9 AM - 5 PM)
IRST and PHT on the World Map
The map below highlights the IRST (Iran Standard Time) and PHT (Philippine 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.
PHT – Philippine Time
UTC+08:00Philippine Time (PHT, UTC+08:00) is the time zone for the Philippines, 8 hours ahead of UTC.
- •Philippine Time does not observe daylight saving, so UTC+08:00 is fixed all year.
- •PHT shares its offset with China, Hong Kong, Singapore and Malaysia.
- •Manila is one of the largest outsourcing hubs in the world.
- •The Philippines spans one time zone despite being an archipelago of over 7,600 islands.
About Manila
WikipediaManila operates on Philippine Time (PHT), UTC+8. As a major BPO hub, Manila time coordinates with US client hours for customer support operations.
Manila is the most densely populated city in the world.
IRST vs Manila: Offsets, DST and Best Call Times
IRST runs on Iran Standard Time (IRST) at UTC+03:30. Manila runs on Philippine Standard Time (PHT) at UTC+08:00. That puts IRST 4 hours 30 minutes ahead of Manila — a difference of +4h 30m at the current offsets.
In practice, when it is 9:00 AM in IRST it is 1:30 PM in Manila. Midnight in IRST is 4:30 AM in Manila. Neither zone observes daylight saving time, so the offset between them stays constant all year.
IRST to Manila time conversion table
| IRST (IRST) | Manila (PHT) | Day |
|---|---|---|
| 12:00 AM | 4:30 AM | same day |
| 6:00 AM | 10:30 AM | same day |
| 7:00 AM | 11:30 AM | same day |
| 8:00 AM | 12:30 PM | same day |
| 9:00 AM | 1:30 PM | same day |
| 12:00 PM | 4:30 PM | same day |
| 3:00 PM | 7:30 PM | same day |
| 5:00 PM | 9:30 PM | same day |
| 6:00 PM | 10:30 PM | same day |
| 9:00 PM | 1:30 AM | next day |
Why people convert IRST to Manila time
- Scheduling a call from IRST to Manila: a 10:00 AM start in IRST lands at 2:30 PM in Manila, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both IRST and Manila are inside the 9-to-5 working day between 9:00 AM and 12:30 PM IRST time (1:30 PM–5:00 PM PHT). That is roughly 3 hours 30 minutes of usable overlap.
- Watching a live event or market open: IRST viewers need 1:30 PM in Manila to catch a 9:00 AM start there, and 7:30 PM if the event is anchored to IRST.
- Always state the zone abbreviation, not just the hour. "3:00 PM IRST" is unambiguous; "3 PM" across a +4h 30m gap is not.
- Block 9:00 AM–12:30 PM IRST as the recurring meeting window if you work primarily from IRST and need Manila colleagues present.
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 PHT (Philippine Time)
Philippine Time (PHT) is fixed at UTC+08:00 all year. The Philippines has not observed daylight saving time since 1978, apart from a brief trial in 1990. PHT shares its offset with China Standard Time, Hong Kong Time, Singapore Time, Malaysian Time and Australian Western Standard Time, which makes Manila a convenient bridge for scheduling across East and Southeast Asia. As one of the world's largest centres for business process outsourcing, Manila keeps overlapping hours with both Australia and, on early shifts, the United States, and its contact-centre schedules are usually planned around Manila local time.
Best time to call between IRST and Manila
Both IRST and Manila sit inside the 9 AM – 5 PM working day between 9:00 AM–12:30 PM IRST, which is 1:30 PM–5:00 PM PHT. That gives roughly 3 hours and 30 minutes of shared time — the safest window for a live call or meeting.
Business hours overlap
IRST and Manila overlap for about 3 hours during the working day — enough for meetings if you avoid the edges of the window.
IRST is 4 hours 30 minutes ahead of Manila (IRST UTC+03:30 → PHT UTC+08:00). The shared working window is 9:00 AM–12:30 PM IRST. Remember to re-check around daylight-saving transitions.
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 Manila?
IRST (IRST, UTC+03:30) is 4 hours 30 minutes ahead of Manila (PHT, UTC+08:00). The gap is currently +4h 30m.
How do I convert IRST time to Manila time?
Add +4h 30m to IRST local time. For example, 9:00 AM in IRST is 1:30 PM in Manila.
What time is it in Manila right now?
Manila uses PHT at UTC+08:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +4h 30m offset from IRST.
What is the best time to call Manila from IRST?
Call between 9:00 AM and 12:30 PM IRST — that maps to 1:30 PM–5:00 PM PHT and keeps both parties inside the working day.
Which is ahead, IRST or Manila?
IRST is 4 hours 30 minutes ahead of Manila. When it is 12:00 PM in IRST it is 4:30 PM in Manila.
Do IRST and Manila use different time zones?
IRST uses IRST at UTC+03:30, while Manila (Philippines) uses PHT at UTC+08:00. The IANA identifiers are Asia/Tehran and Asia/Manila.
Does daylight saving time affect the IRST–Manila difference?
Neither zone observes daylight saving time, so the +4h 30m offset between IRST and Manila is fixed all year.
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 Manila?
Not normally. The +4h 30m gap only pushes the date over for late-evening times.
What is the time difference between IRST and Manila?
Manila is +4h 30m from IRST.
What timezone is IRST in?
IRST operates on its local timezone.
What timezone is Manila in?
Manila operates on Philippine Time (PHT), UTC+8. As a major BPO hub, Manila time coordinates with US client hours for customer support operations.
What are the business hours in Manila?
Standard business hours in Manila are 8:00 AM - 5:00 PM PHT.
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 PHT timezone?
Major cities in the PHT timezone include Manila, Quezon City, Davao City, Cebu City, Zamboanga.
What is the UTC offset for PHT?
Philippine Time (PHT) is at UTC+08:00.
What should I know about the PHT timezone?
Philippine Time does not observe daylight saving, so UTC+08:00 is fixed all year. PHT shares its offset with China, Hong Kong, Singapore and Malaysia.
When is it midnight in IRST, what time is it in Manila?
When it is 12:00 AM (midnight) in IRST (IRST), it is +4h 30m later in Manila (PHT).
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