AST to PHT
+12hAST
ASTSOURCEPHT
PHTGreen rows indicate typical business hours (9 AM - 5 PM)
AST and PHT on the World Map
The map below highlights the AST (Atlantic Standard Time) and PHT (Philippine Time) timezone regions across the globe.
AST – Atlantic Standard Time
UTC-04:00Atlantic Standard Time (AST) is the time zone for the Canadian Atlantic provinces and the Caribbean, 4 hours behind UTC.
- •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.
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.
Time Conversion Guide: AST to PHT
AST runs on Atlantic Standard Time (AST) at UTC-04:00. PHT runs on Philippine Time (PHT) at UTC+08:00. That puts AST 12 hours ahead of PHT — a difference of +12h at the current offsets.
In practice, when it is 9:00 AM in AST it is 9:00 PM in PHT. Midnight in AST is 12:00 PM in PHT. Neither zone observes daylight saving time, so the offset between them stays constant all year.
AST to PHT time conversion table
| AST (AST) | PHT (PHT) | Day |
|---|---|---|
| 12:00 AM | 12:00 PM | same day |
| 6:00 AM | 6:00 PM | same day |
| 7:00 AM | 7:00 PM | same day |
| 8:00 AM | 8:00 PM | same day |
| 9:00 AM | 9:00 PM | same day |
| 12:00 PM | 12:00 AM | next day |
| 3:00 PM | 3:00 AM | next day |
| 5:00 PM | 5:00 AM | next day |
| 6:00 PM | 6:00 AM | next day |
| 9:00 PM | 9:00 AM | next day |
Why people convert AST to PHT time
- Scheduling a call from AST to PHT: a 10:00 AM start in AST lands at 10:00 PM in PHT, so you can confirm the slot without doing the arithmetic yourself.
- Handling a +12h gap: AST and PHT 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 PHT is 9:00 PM in AST.
- Coordinating a AST-based team with PHT 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 AST" 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 AST takes the early slot, the next week PHT does.
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.
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 AST and PHT
With a +12h offset there is no overlap inside a normal 9 AM – 5 PM day. PHT opens at 9:00 AM PHT, which is 9:00 PM in AST, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
AST and PHT have no shared working hours because of the +12h gap. Teams need to alternate early starts or rely on asynchronous handovers.
AST is 12 hours ahead of PHT (AST UTC-04:00 → PHT UTC+08:00). 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
AST
☀ Currently in DST
Standard: UTC-04:00 · DST: UTC-03:00
Clocks fall back on Sun, Nov 1, 2026
PHT
Does not observe DST
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 AST and PHT?
AST (AST, UTC-04:00) is 12 hours ahead of PHT (PHT, UTC+08:00). The gap is currently +12h.
How do I convert AST time to PHT time?
Add +12h to AST local time. For example, 9:00 AM in AST is 9:00 PM in PHT.
What time is it in PHT right now?
PHT 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 +12h offset from AST.
What is the best time to call PHT from AST?
There is no shared working-hours window because of the +12h gap. The closest option is 1:00 PM in AST, which is 1:00 AM in PHT.
Which is ahead, AST or PHT?
AST is 12 hours ahead of PHT. When it is 12:00 PM in AST it is 12:00 AM in PHT.
Does daylight saving time affect the AST–PHT difference?
Neither zone observes daylight saving time, so the +12h offset between AST and PHT is fixed all year.
Which other cities share AST's time zone?
AST also covers Halifax, San Juan, Santo Domingo, Caracas, La Paz, Fredericton, Charlottetown.
Which countries use AST, AST's zone?
AST is used in Canada (Atlantic provinces), Puerto Rico, US Virgin Islands, Dominican Republic, Venezuela, Bolivia, Barbados, Trinidad and Tobago.
Is there a day difference between AST and PHT?
Sometimes. The +12h gap is large enough that 8:00 PM or later in AST already falls on the next day in PHT.
What is the time difference between AST and PHT?
PHT is +12h from AST.
What timezone is AST in?
AST operates on its local timezone.
What timezone is PHT in?
PHT operates on its local timezone.
Which countries use AST (Atlantic Standard Time)?
AST is used in Canada (Atlantic provinces), Puerto Rico, US Virgin Islands, Dominican Republic, Venezuela, Bolivia, and 2 more countries.
Does AST observe daylight saving time?
Yes, AST switches to ADT during summer months.
What are some interesting facts about AST?
Puerto Rico uses AST year-round and does not observe DST. AST is 1 hour ahead of EST.
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 AST, what time is it in PHT?
When it is 12:00 AM (midnight) in AST (AST), it is +12h later in PHT (PHT).
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See every conversion from AST →·See every conversion from PHT →