timeinusa.net

MST to PST — Mountain to Pacific Time

Pacific Time is 1 hour behind Mountain Time, twelve months a year.

The conversion rule

Subtract 1 hour from Mountain Time to get Pacific Time. 12:00 PM MST is 11:00 AM PST. Denver and Los Angeles change clocks on the same dates, so the hour between them holds.

10:00 AM–5:00 PM MT / 9:00 AM–4:00 PM PT keeps both sides inside the 9-to-5 — everything except Denver's opening hour and the Pacific zone's final one.

Arizona note: because Phoenix skips DST, from March to November its clocks show exactly the same time as California's — MST and PDT are both UTC−7.

MST to PST conversion chart

Mountain (MST/MDT)Pacific (PST/PDT)
12:00 AM (midnight)11:00 PM (prev. day)
1:00 AM12:00 AM (midnight)
2:00 AM1:00 AM
3:00 AM2:00 AM
4:00 AM3:00 AM
5:00 AM4:00 AM
6:00 AM5:00 AM
7:00 AM6:00 AM
8:00 AM7:00 AM
9:00 AM8:00 AM
10:00 AM9:00 AM
11:00 AM10:00 AM
12:00 PM (noon)11:00 AM
1:00 PM12:00 PM (noon)
2:00 PM1:00 PM
3:00 PM2:00 PM
4:00 PM3:00 PM
5:00 PM4:00 PM
6:00 PM5:00 PM
7:00 PM6:00 PM
8:00 PM7:00 PM
9:00 PM8:00 PM
10:00 PM9:00 PM
11:00 PM10:00 PM

Reverse direction: PST to MST (add 1 hour). Related: MST to EST, MST to CST, MST to AKST.

Frequently asked questions

Is the MST–PST difference constant?

Between DST-observing areas, yes: 1 hour year-round. Phoenix is the special case — in summer Arizona's MST equals Pacific Daylight Time, so the difference to California drops to zero.

What is 9:00 AM MST in PST?

8:00 AM PST, an hour before the typical Pacific workday begins.

When is 4:00 PM PST in Denver?

5:00 PM MST — the Pacific mid-afternoon wraps up the Mountain business day.