PHT to MST
-15hPHT
PHTSOURCEMST
MSTGreen rows indicate typical business hours (9 AM - 5 PM)
PHT and MST on the World Map
The map below highlights the PHT (Philippine Time) and MST (Mountain Standard Time) timezone regions across the globe.
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.
MST – Mountain Standard Time
UTC-07:00Mountain Standard Time (MST) is the time zone for the Mountain region of North America, 7 hours behind UTC.
- •Arizona does not observe daylight saving time, staying on MST year-round.
- •The Navajo Nation in Arizona does observe DST, unlike the rest of the state.
- •Denver, the 'Mile High City', is the largest city fully in MST.
- •MST covers 6 US states entirely and parts of several others.
Understanding the -15h Gap: PHT vs MST
PHT runs on Philippine Time (PHT) at UTC+08:00. MST runs on Mountain Standard Time (MST) at UTC-07:00. That puts PHT 15 hours behind MST — a difference of -15h at the current offsets.
In practice, when it is 9:00 AM in PHT it is 6:00 PM in MST on the previous day. Midnight in PHT is 9:00 AM in MST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
PHT to MST time conversion table
| PHT (PHT) | MST (MST) | Day |
|---|---|---|
| 12:00 AM | 9:00 AM | previous day |
| 6:00 AM | 3:00 PM | previous day |
| 7:00 AM | 4:00 PM | previous day |
| 8:00 AM | 5:00 PM | previous day |
| 9:00 AM | 6:00 PM | previous day |
| 12:00 PM | 9:00 PM | previous day |
| 3:00 PM | 12:00 AM | same day |
| 5:00 PM | 2:00 AM | same day |
| 6:00 PM | 3:00 AM | same day |
| 9:00 PM | 6:00 AM | same day |
Why people convert PHT to MST time
- Scheduling a call from PHT to MST: a 10:00 AM start in PHT lands at 7:00 PM in MST the previous day, so you can confirm the slot without doing the arithmetic yourself.
- Handling a -15h gap: PHT and MST 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 MST is 6:00 PM in PHT.
- Keeping family and friends in sync: knowing that 8:00 PM in PHT is 5:00 AM in MST 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 -15h gap is not.
- With a -15h gap there is no shared 9-to-5 window, so alternate the early start: one week PHT takes the early slot, the next week MST 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 MST (Mountain Standard Time)
Mountain Standard Time (MST) covers the Rocky Mountain region of the United States and Canada. Arizona is notable for not observing daylight saving time, staying on MST year-round (except the Navajo Nation). The time zone includes major cities like Denver, Phoenix, Calgary, and Salt Lake City. During summer, most areas switch to Mountain Daylight Time (MDT, UTC-06:00).
Best time to call between PHT and MST
With a -15h offset there is no overlap inside a normal 9 AM – 5 PM day. MST opens at 9:00 AM MST, which is 6:00 PM in PHT, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
PHT and MST have no shared working hours because of the -15h gap. Teams need to alternate early starts or rely on asynchronous handovers.
PHT is 15 hours behind MST (PHT UTC+08:00 → MST UTC-07:00). 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
MST
☀ Currently in DST
Standard: UTC-07:00 · DST: UTC-06:00
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:
Frequently Asked Questions
What is the time difference between PHT and MST?
PHT (PHT, UTC+08:00) is 15 hours behind MST (MST, UTC-07:00). The gap is currently -15h.
How do I convert PHT time to MST time?
Add -15h to PHT local time. For example, 9:00 AM in PHT is 6:00 PM in MST (previous day).
What time is it in MST right now?
MST uses MST at UTC-07:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -15h offset from PHT.
What is the best time to call MST from PHT?
There is no shared working-hours window because of the -15h gap. The closest option is 1:00 PM in PHT, which is 10:00 PM in MST.
Which is behind, PHT or MST?
PHT is 15 hours behind MST. When it is 12:00 PM in PHT it is 9:00 PM in MST.
Does daylight saving time affect the PHT–MST difference?
Neither zone observes daylight saving time, so the -15h offset between PHT and MST 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 MST?
Sometimes. The -15h gap is large enough that 8:00 PM or later in PHT already falls on the in MST.
What is the time difference between PHT and MST?
MST is -15h from PHT.
What timezone is PHT in?
PHT operates on its local timezone.
What timezone is MST in?
MST 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.
Which cities are in the MST timezone?
Major cities in the MST timezone include Denver, Phoenix, Salt Lake City, Calgary, Edmonton, Albuquerque, El Paso, Tucson.
What is the UTC offset for MST?
Mountain Standard Time (MST) is at UTC-07:00. During daylight saving time, it shifts to MDT.
What should I know about the MST timezone?
Arizona does not observe daylight saving time, staying on MST year-round. The Navajo Nation in Arizona does observe DST, unlike the rest of the state.
When is it midnight in PHT, what time is it in MST?
When it is 12:00 AM (midnight) in PHT (PHT), it is -15h later in MST (MST).
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