Does it account for Daylight Saving Time?

Yes, our converter uses the IANA timezone database, which includes all current DST rules for every timezone in the world.

UTC (Coordinated Universal Time) is the primary time standard by which the world regulates clocks. All timezones are defined as offsets from UTC.

Can I compare multiple timezones at once?

Yes, you can add multiple cities or timezones and see the equivalent times side by side.

How many timezones are there in the world?

There are 38 distinct UTC offsets in use, ranging from UTC-12 to UTC+14. This includes half-hour (UTC+5:30 India, UTC+9:30 Australia) and 45-minute offsets (UTC+5:45 Nepal, UTC+8:45 Australia).

What is the International Date Line?

The International Date Line (IDL) runs roughly along the 180° meridian in the Pacific Ocean. When you cross it westward, you gain a day; crossing eastward, you lose a day.

Why do some timezones have 30 or 45 minute offsets?

Countries chose offsets that best matched their solar noon. India uses UTC+5:30 and Nepal uses UTC+5:45 because standard hourly offsets didn't align well with their geography.

Which country has the most timezones?

France has the most (12 timezones) due to overseas territories. Russia spans 11 timezones. The US has 6 (including Hawaii and Alaska).

Manila to IRST

-4h 30m

Manila

PHTSOURCE

Philippines · UTC+08:00

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

IRST

UTC+03:30

HH07

MM30

07:30 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

Manila

IRST

12:00 AM

7:30 PM-1

2:00 AM

9:30 PM-1

4:00 AM

11:30 PM-1

6:00 AM

1:30 AM

8:00 AM

3:30 AM

10:00 AM

5:30 AM

12:00 PM

7:30 AM

2:00 PM

9:30 AM

4:00 PM

11:30 AM

6:00 PM

1:30 PM

8:00 PM

3:30 PM

10:00 PM

5:30 PM

Green rows indicate typical business hours (9 AM - 5 PM)

PHT and IRST on the World Map

The map below highlights the PHT (Philippine Time) and IRST (Iran Standard Time) timezone regions across the globe.

PHT Zone

→

IRST Zone

Explore all world timezones interactively →

PHT – Philippine Time

UTC+08:00

Philippine Time (PHT, UTC+08:00) is the time zone for the Philippines, 8 hours ahead of UTC.

Countries in PHT

Philippines

Major Cities in PHT

ManilaQuezon CityDavao CityCebu CityZamboanga

Key Facts about PHT

•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.

Daylight Saving:No – UTC+08:00 year-round

Learn more about PHT on Wikipedia

IRST – Iran Standard Time

UTC+03:30

Iran Standard Time (IRST) is the time zone for Iran, 3 hours and 30 minutes ahead of UTC.

Countries in IRST

Iran

Major Cities in IRST

TehranIsfahanMashhadTabrizShirazKaraj

Key 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).
•Tehran has a metropolitan population of over 16 million.

Daylight Saving:Yes – switches to IRDT

Learn more about IRST on Wikipedia

About Manila

Wikipedia

Manila operates on Philippine Time (PHT), UTC+8. As a major BPO hub, Manila time coordinates with US client hours for customer support operations.

Population:1.8 million

Metro:14.4 million

Business Hours:8:00 AM - 5:00 PM PHT

Currency:PHP (₱)

Stock Exchange:PSE (Philippine Stock Exchange)

Key Landmarks

IntramurosRizal ParkManila Ocean ParkSan Agustin ChurchManila Cathedral

Did You Know?

Manila is the most densely populated city in the world.

Learn more about PHT timezone →

Understanding the -4h 30m Gap: Manila vs IRST

Manila runs on Philippine Standard Time (PHT) at UTC+08:00. IRST runs on Iran Standard Time (IRST) at UTC+03:30. That puts Manila 4 hours 30 minutes behind IRST — a difference of -4h 30m at the current offsets.

In practice, when it is 9:00 AM in Manila it is 4:30 AM in IRST. Midnight in Manila is 7:30 PM in IRST. Neither zone observes daylight saving time, so the offset between them stays constant all year.

Manila to IRST time conversion table

Manila (PHT)	IRST (IRST)	Day
12:00 AM	7:30 PM	previous day
6:00 AM	1:30 AM	same day
7:00 AM	2:30 AM	same day
8:00 AM	3:30 AM	same day
9:00 AM	4:30 AM	same day
12:00 PM	7:30 AM	same day
3:00 PM	10:30 AM	same day
5:00 PM	12:30 PM	same day
6:00 PM	1:30 PM	same day
9:00 PM	4:30 PM	same day

Why people convert Manila to IRST time

Scheduling a call from Manila to IRST: a 10:00 AM start in Manila lands at 5:30 AM in IRST, so you can confirm the slot without doing the arithmetic yourself.
Finding shared working hours: both Manila and IRST are inside the 9-to-5 working day between 1:30 PM and 5:00 PM PHT time (9:00 AM–12:30 PM IRST). That is roughly 3 hours 30 minutes of usable overlap.
Booking travel or deliveries: tracking IRST local time against Manila keeps pickup windows and arrival estimates honest across the -4h 30m offset.

Always state the zone abbreviation, not just the hour. "3:00 PM PHT" is unambiguous; "3 PM" across a -4h 30m gap is not.
Block 1:30 PM–5:00 PM PHT as the recurring meeting window if you work primarily from Manila and need IRST colleagues present.

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.

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.

Best time to call between Manila and IRST

Both Manila and IRST sit inside the 9 AM – 5 PM working day between 1:30 PM–5:00 PM PHT, which is 9:00 AM–12:30 PM IRST. That gives roughly 3 hours and 30 minutes of shared time — the safest window for a live call or meeting.

Business hours overlap

Manila and IRST overlap for about 3 hours during the working day — enough for meetings if you avoid the edges of the window.

Manila is 4 hours 30 minutes behind IRST (PHT UTC+08:00 → IRST UTC+03:30). The shared working window is 1:30 PM–5:00 PM PHT. 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:

⏳

History of Timekeeping

From sundials to atomic clocks - 5000 years of measuring time

🌍

How Time Zones Work

UTC, offsets, and why zones don't follow straight lines

☀️

Daylight Saving Time

DST dates, which countries observe it, and the ongoing debate

Frequently Asked Questions

What is the time difference between Manila and IRST?

Manila (PHT, UTC+08:00) is 4 hours 30 minutes behind IRST (IRST, UTC+03:30). The gap is currently -4h 30m.

How do I convert Manila time to IRST time?

Add -4h 30m to Manila local time. For example, 9:00 AM in Manila is 4:30 AM in IRST.

What time is it in IRST right now?

IRST uses IRST at UTC+03:30. Use the live converter at the top of this page — it updates in real time and already accounts for the -4h 30m offset from Manila.

What is the best time to call IRST from Manila?

Call between 1:30 PM and 5:00 PM PHT — that maps to 9:00 AM–12:30 PM IRST and keeps both parties inside the working day.

Which is behind, Manila or IRST?

Manila is 4 hours 30 minutes behind IRST. When it is 12:00 PM in Manila it is 7:30 AM in IRST.

Do Manila and IRST use different time zones?

Manila (Philippines) uses PHT at UTC+08:00, while IRST uses IRST at UTC+03:30. The IANA identifiers are Asia/Manila and Asia/Tehran.

Does daylight saving time affect the Manila–IRST difference?

Neither zone observes daylight saving time, so the -4h 30m offset between Manila and IRST is fixed all year.

Which other cities share Manila's time zone?

PHT also covers Manila, Quezon City, Davao City, Cebu City, Zamboanga.

Which countries use PHT, Manila's zone?

PHT is used in Philippines.

Is there a day difference between Manila and IRST?

Not normally. The -4h 30m gap only pushes the date over the previous day.

What is the time difference between Manila and IRST?

IRST is -4h 30m from Manila.

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 timezone is IRST in?

IRST operates on its local timezone.

What are the business hours in Manila?

Standard business hours in Manila are 8:00 AM - 5:00 PM PHT.

Which countries use PHT (Philippine Time)?

PHT is used in Philippines.

Does PHT observe daylight saving time?

No, PHT does not observe daylight saving time and remains at UTC+08:00 year-round.

What are some interesting facts about PHT?

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.