Mountain Time (MT) is 1 hour ahead of Pacific Standard Time (PST) during standard time and 2 hours ahead during daylight saving time. This conversion accounts for the two main time zones in the western United States.
When converting between Mountain Time and PST, you must account for whether daylight saving time is in effect. During standard time (November to March), Mountain Time is 1 hour ahead of PST., during daylight saving time, Mountain Daylight Time (MDT) is 2 hours ahead of Pacific Daylight Time (PDT).
For example, if it's 3:00 PM MT during standard time, it's 2:00 PM PST. But during daylight saving time, 3:00 PM MDT equals 1:00 PM PDT.
The two primary conversions between Mountain Time and PST depend on the time of year:
| Time Period | Mountain Time | Pacific Time |
|---|---|---|
| Standard Time (Nov - Mar) | Mountain Standard Time (MST) | Pacific Standard Time (PST) |
| Daylight Saving Time (Mar - Nov) | Mountain Daylight Time (MDT) | Pacific Daylight Time (PDT) |
This conversion is important for scheduling across western states. For instance, a business meeting set for 10:00 AM MT in Denver would be at 9:00 AM PST in Los Angeles during standard time, but only 8:00 AM PST during daylight saving time.
A common mistake is assuming the same offset year-round. The U.S. Department of Transportation oversees time zone regulations, including daylight saving adjustments. Always verify the current date to ensure accurate conversion.
Many people confuse Mountain Time with Central Time or assume the offset remains constant. Unlike Central Time, which is 1 hour ahead of Mountain Time, the Mountain-to-Pacific conversion changes with daylight saving time. Another error is overlooking that not all locations observe daylight saving time, such as the Navajo Nation in Arizona.
While traveling from Salt Lake City to San Francisco, I scheduled a call for 2:00 PM MT, forgetting about daylight saving time. My colleague in San Francisco received the call at 12:00 PM PDT instead of the intended 1:00 PM. Double-checking the conversion beforehand would have prevented this mix-up.