Does it handle Daylight Saving Time?

Yes, the tool automatically adjusts for Daylight Saving Time based on the specific date you select, ensuring accurate conversions year-round.

Can I add multiple cities?

Yes, you can add as many cities as you need to the dashboard to compare times across your entire global network simultaneously.

PHT to AST

-12h

PHT

PHTSOURCE

UTC+08:00

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

AST

UTC-03:00☀ DST active

HH12

MM00

00:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

PHT

AST

12:00 AM

1:00 PM-1

2:00 AM

3:00 PM-1

4:00 AM

5:00 PM-1

6:00 AM

7:00 PM-1

8:00 AM

9:00 PM-1

10:00 AM

11:00 PM-1

12:00 PM

1:00 AM

2:00 PM

3:00 AM

4:00 PM

5:00 AM

6:00 PM

7:00 AM

8:00 PM

9:00 AM

10:00 PM

11:00 AM

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

PHT and AST on the World Map

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

PHT Zone

→

AST 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

AST – Atlantic Standard Time

UTC-04:00

Atlantic Standard Time (AST) is the time zone for the Canadian Atlantic provinces and the Caribbean, 4 hours behind UTC.

Countries in AST

Canada (Atlantic provinces)Puerto RicoUS Virgin IslandsDominican RepublicVenezuelaBoliviaBarbadosTrinidad and Tobago

Major Cities in AST

HalifaxSan JuanSanto DomingoCaracasLa PazFrederictonCharlottetown

Key Facts about AST

•Puerto Rico uses AST year-round and does not observe DST.
•AST is 1 hour ahead of EST.
•Halifax, the capital of Nova Scotia, is the largest city in AST Canada.

Daylight Saving:Yes – switches to ADT

Learn more about AST on Wikipedia

Understanding the -12h Gap: PHT vs AST

PHT runs on Philippine Time (PHT) at UTC+08:00. AST runs on Atlantic Standard Time (AST) at UTC-04:00. That puts PHT 12 hours behind AST — a difference of -12h at the current offsets.

In practice, when it is 9:00 AM in PHT it is 9:00 PM in AST on the previous day. Midnight in PHT is 12:00 PM in AST. Neither zone observes daylight saving time, so the offset between them stays constant all year.

PHT to AST time conversion table

PHT (PHT)	AST (AST)	Day
12:00 AM	12:00 PM	previous day
6:00 AM	6:00 PM	previous day
7:00 AM	7:00 PM	previous day
8:00 AM	8:00 PM	previous day
9:00 AM	9:00 PM	previous day
12:00 PM	12:00 AM	same day
3:00 PM	3:00 AM	same day
5:00 PM	5:00 AM	same day
6:00 PM	6:00 AM	same day
9:00 PM	9:00 AM	same day

Why people convert PHT to AST time

Scheduling a call from PHT to AST: a 10:00 AM start in PHT lands at 10:00 PM in AST the previous day, so you can confirm the slot without doing the arithmetic yourself.
Handling a -12h gap: PHT and AST have no overlap inside a normal 9-to-5 day, so real-time meetings need an early-morning or late-evening slot on one side. 9:00 AM in AST is 9:00 PM in PHT.
Keeping family and friends in sync: knowing that 8:00 PM in PHT is 8:00 AM in AST makes it easy to avoid calling at 3 AM.

Always state the zone abbreviation, not just the hour. "3:00 PM PHT" is unambiguous; "3 PM" across a -12h gap is not.
With a -12h gap there is no shared 9-to-5 window, so alternate the early start: one week PHT takes the early slot, the next week AST does.

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 AST (Atlantic Standard Time)

Atlantic Standard Time (AST) covers Canada's Atlantic provinces (Nova Scotia, New Brunswick, Prince Edward Island, and most of Labrador), as well as several Caribbean nations. Puerto Rico and the US Virgin Islands use AST year-round without daylight saving time. The Canadian provinces switch to Atlantic Daylight Time (ADT) in summer.

Best time to call between PHT and AST

With a -12h offset there is no overlap inside a normal 9 AM – 5 PM day. AST opens at 9:00 AM AST, which is 9:00 PM in PHT, so real-time calls need an early-morning or late-evening slot on one side.

Business hours overlap

PHT and AST have no shared working hours because of the -12h gap. Teams need to alternate early starts or rely on asynchronous handovers.

PHT is 12 hours behind AST (PHT UTC+08:00 → AST UTC-04:00). There is no shared 9-to-5 window, so plan around an early or late slot. Remember to re-check around daylight-saving transitions.

🕐 Daylight Saving Time Info

PHT

Does not observe DST

AST

☀ Currently in DST

Standard: UTC-04:00 · DST: UTC-03:00

Clocks fall back on Sun, Nov 1, 2026

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 PHT and AST?

PHT (PHT, UTC+08:00) is 12 hours behind AST (AST, UTC-04:00). The gap is currently -12h.

How do I convert PHT time to AST time?

Add -12h to PHT local time. For example, 9:00 AM in PHT is 9:00 PM in AST (previous day).

What time is it in AST right now?

AST uses AST at UTC-04:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -12h offset from PHT.

What is the best time to call AST from PHT?

There is no shared working-hours window because of the -12h gap. The closest option is 1:00 PM in PHT, which is 1:00 AM in AST.

Which is behind, PHT or AST?

PHT is 12 hours behind AST. When it is 12:00 PM in PHT it is 12:00 AM in AST.

Does daylight saving time affect the PHT–AST difference?

Neither zone observes daylight saving time, so the -12h offset between PHT and AST is fixed all year.

Which other cities share PHT's time zone?

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

Which countries use PHT, PHT's zone?

PHT is used in Philippines.

Is there a day difference between PHT and AST?

Sometimes. The -12h gap is large enough that 8:00 PM or later in PHT already falls on the in AST.

What is the time difference between PHT and AST?

AST is -12h from PHT.

What timezone is PHT in?

PHT operates on its local timezone.

What timezone is AST in?

AST operates on its local timezone.

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.