SGT to MST
-15hSGT
SGTSOURCEMST
MSTGreen rows indicate typical business hours (9 AM - 5 PM)
SGT and MST on the World Map
The map below highlights the SGT (Singapore Standard Time) and MST (Mountain Standard Time) timezone regions across the globe.
SGT – Singapore Standard Time
UTC+08:00Singapore Standard Time (SGT) is the time zone for Singapore, 8 hours ahead of UTC.
- •Singapore uses UTC+08:00 despite being at about 104°E longitude (closer to UTC+07:00).
- •Singapore does not observe daylight saving time.
- •The Singapore Exchange (SGX) operates on SGT.
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.
SGT vs MST: Offsets, DST and Best Call Times
SGT runs on Singapore Standard Time (SGT) at UTC+08:00. MST runs on Mountain Standard Time (MST) at UTC-07:00. That puts SGT 15 hours behind MST — a difference of -15h at the current offsets.
In practice, when it is 9:00 AM in SGT it is 6:00 PM in MST on the previous day. Midnight in SGT is 9:00 AM in MST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
SGT to MST time conversion table
| SGT (SGT) | 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 SGT to MST time
- Scheduling a call from SGT to MST: a 10:00 AM start in SGT 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: SGT 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 SGT.
- Booking travel or deliveries: tracking MST local time against SGT keeps pickup windows and arrival estimates honest across the -15h offset.
- Always state the zone abbreviation, not just the hour. "3:00 PM SGT" 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 SGT takes the early slot, the next week MST does.
About SGT (Singapore Standard Time)
Singapore Standard Time (SGT) is used in Singapore year-round. Singapore does not observe daylight saving time. Despite being geographically close to the UTC+07:00 zone, Singapore uses UTC+08:00 to align with major trading partners like China, Hong Kong, and Malaysia. Singapore is a major global financial hub.
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 SGT 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 SGT, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
SGT and MST have no shared working hours because of the -15h gap. Teams need to alternate early starts or rely on asynchronous handovers.
SGT is 15 hours behind MST (SGT 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
SGT
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 SGT and MST?
SGT (SGT, UTC+08:00) is 15 hours behind MST (MST, UTC-07:00). The gap is currently -15h.
How do I convert SGT time to MST time?
Add -15h to SGT local time. For example, 9:00 AM in SGT 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 SGT.
What is the best time to call MST from SGT?
There is no shared working-hours window because of the -15h gap. The closest option is 1:00 PM in SGT, which is 10:00 PM in MST.
Which is behind, SGT or MST?
SGT is 15 hours behind MST. When it is 12:00 PM in SGT it is 9:00 PM in MST.
Does daylight saving time affect the SGT–MST difference?
Neither zone observes daylight saving time, so the -15h offset between SGT and MST is fixed all year.
Which other cities share SGT's time zone?
SGT also covers Singapore.
Which countries use SGT, SGT's zone?
SGT is used in Singapore.
Is there a day difference between SGT and MST?
Sometimes. The -15h gap is large enough that 8:00 PM or later in SGT already falls on the in MST.
What is the time difference between SGT and MST?
MST is -15h from SGT.
What timezone is SGT in?
SGT operates on its local timezone.
What timezone is MST in?
MST operates on its local timezone.
Which countries use SGT (Singapore Standard Time)?
SGT is used in Singapore.
Does SGT observe daylight saving time?
No, SGT does not observe daylight saving time and remains at UTC+08:00 year-round.
What are some interesting facts about SGT?
Singapore uses UTC+08:00 despite being at about 104°E longitude (closer to UTC+07:00). Singapore does not observe daylight saving time.
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 SGT, what time is it in MST?
When it is 12:00 AM (midnight) in SGT (SGT), it is -15h later in MST (MST).
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See every conversion from SGT →·See every conversion from MST →