Phoenix to San Juan Time
MST to AST Converter — 9 AM MST is 12:00 PM AST
Phoenix is 3 hours behind San Juan. Convert any time between Phoenix (MST) and San Juan (AST) instantly.
Phoenix
United States
San Juan
Puerto Rico
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Time Zone Comparison
Phoenix to San Juan Time Conversion Table
| Phoenix (MST) | San Juan (AST) |
|---|---|
| 12:00 AM | 3:00 AM |
| 2:00 AM | 5:00 AM |
| 4:00 AM | 7:00 AM |
| 6:00 AM | 9:00 AM |
| 8:00 AM | 11:00 AM |
| 10:00 AM | 1:00 PM |
| 12:00 PM | 3:00 PM |
| 2:00 PM | 5:00 PM |
| 4:00 PM | 7:00 PM |
| 6:00 PM | 9:00 PM |
| 8:00 PM | 11:00 PM |
| 10:00 PM | 1:00 AM |
Phoenix & San Juan — Business & Scheduling Guide
Phoenix (United States) is a global financial and tech hub, with key industries in technology, finance, healthcare, and entertainment. San Juan (Puerto Rico) is a US territory with pharmaceutical and tech manufacturing, known for pharmaceuticals, medical devices, electronics, and tourism. With a 3-hour time difference, professionals frequently schedule cross-border calls between these two cities for international trade, remote team collaboration, and client meetings.
Scheduling Meetings Between Phoenix and San Juan
With only a 3-hour gap, Phoenix and San Juan have generous overlapping work hours. Morning calls in the later time zone align well with mid-day in the other. US business hours typically run 9 AM–5 PM, with a culture that values punctuality and efficiency. Puerto Rican business hours are typically 8 AM–5 PM, with a bilingual (English/Spanish) workforce. Most teams find that late morning to early afternoon offers the widest window for collaboration.
Daylight Saving Time Considerations
Neither Phoenix nor San Juan observes Daylight Saving Time — Phoenix stays on MST and San Juan stays on AST year-round. This makes scheduling between these two cities simpler, as the 3-hour time difference remains constant throughout the year with no DST surprises.
Collaboration Tools & Workflow
Teams working between Phoenix and San Juan enjoy strong real-time collaboration potential. With just a 3-hour time difference, daily standups, pair programming, and spontaneous video calls are all practical. Popular tools for Phoenix–San Juan teams include Slack for real-time messaging, Google Meet or Zoom for video calls, and Notion or Linear for project management. The overlapping work window is wide enough that most teams can operate nearly synchronously.
Remote Work Between Phoenix & San Juan
Phoenix, a key city in United States, and San Juan, a key city in Puerto Rico, are well-connected for remote work. With a manageable 3-hour time difference, distributed teams can maintain a near-synchronous workflow. Both cities have strong internet infrastructure, coworking spaces, and established remote work cultures. For freelancers and remote workers, this time zone pairing is ideal — you can serve clients in San Juan from Phoenix (or vice versa) without disrupting your standard workday.
MST to AST — Quick Reference
MST (MST) stands for the timezone used in Phoenix, United States (UTC-7). AST (AST) is the timezone used in San Juan, Puerto Rico (UTC-4). Phoenix is 3 hours behind San Juan.
To convert MST to AST, add 3 hours to MST time. For example, MST 9:00 AM = AST 12:00 PM.
Key Facts
- •Time difference: Phoenix (UTC-7) is 3 hours behind San Juan (UTC-4).
- •Daylight Saving Time: Phoenix does not observe DST (MST). San Juan does not observe DST (AST).
- •Regions: Phoenix is located in United States and uses the MST time zone. San Juan is located in Puerto Rico and uses the AST time zone.
- •Best time to call: The best time to call between Phoenix and San Juan is 9:00 AM to 1:00 PM in Phoenix time, when both cities have overlapping standard working hours.
Frequently Asked Questions
What is the time difference between Phoenix and San Juan?
Phoenix is 3 hours behind San Juan.
What time is it in San Juan when it's 9 AM in Phoenix?
When it's 9:00 AM in Phoenix, it is 12:00 PM in San Juan.
What time is 9 PM MST in AST?
9 PM MST (Phoenix time) is 12:00 AM AST (San Juan time). This is a common time people check when scheduling evening calls across these two time zones.
When is the best time to schedule a meeting between Phoenix and San Juan?
The best time to schedule a meeting is between 9:00 AM to 1:00 PM in Phoenix time, when both cities are within standard working hours (9 AM – 5 PM). This gives you the maximum overlap window for real-time collaboration.
How do I convert MST to AST?
MST (MST) is the timezone for Phoenix, United States (UTC-7). AST (AST) is the timezone for San Juan, Puerto Rico (UTC-4). Phoenix is 3 hours behind San Juan. Quick examples: 9 AM MST = 12:00 PM AST, 12 PM MST = 3:00 PM AST, 3 PM MST = 6:00 PM AST, 6 PM MST = 9:00 PM AST.
Is Phoenix ahead of or behind San Juan?
Phoenix is 3 hours behind San Juan. When it's noon in Phoenix, it's 3:00 PM in San Juan.
Does Phoenix or San Juan change clocks for Daylight Saving Time?
No, Phoenix does not observe DST — it stays on MST year-round. San Juan does not observe DST — it stays on AST year-round.
What time is noon in Phoenix in San Juan time?
When it is 12:00 PM (noon) in Phoenix (MST), it is 3:00 PM in San Juan (AST). This is often a popular time for scheduling lunch-hour calls across the Phoenix–San Juan corridor.
What are the overlapping work hours between Phoenix and San Juan?
The overlapping work hours between Phoenix and San Juan are approximately 9:00 AM to 1:00 PM in Phoenix time, when both cities are within the standard 9 AM–5 PM workday. This is the ideal window for meetings, pair programming, and real-time collaboration.
What timezone is Phoenix in?
Phoenix is in the MST time zone (UTC-7). It is located in United States. Phoenix does not observe Daylight Saving Time.
What timezone is San Juan in?
San Juan is in the AST time zone (UTC-4). It is located in Puerto Rico. San Juan does not observe Daylight Saving Time.
How do I schedule a call between Phoenix and San Juan?
To schedule a call between Phoenix and San Juan, aim for the overlapping window of 9:00 AM to 1:00 PM in Phoenix time. Use Google Calendar or Calendly with both time zones visible, share the meeting invite with the AST time clearly noted, and always double-check the time difference — especially during DST transitions. Pro tip: include both local times in the calendar invite title (e.g., "Sync — 10 AM MST / 1:00 PM AST").
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