Mountain time for people on the West Coast
Pacific is one hour behind Mountain. A 9:00 AM start in Denver is 8:00 AM in Los Angeles, and a 6:00 PM Mountain dinner booking is 5:00 PM on the coast. Enter a Mountain time or press Use now.
Arizona makes this pair confusing. Most of Arizona stays on MST all year. In winter, Phoenix is an hour ahead of Los Angeles, as Denver is. In summer, Los Angeles moves forward to PDT and Phoenix stays put, so the two cities show the same clock time. This page follows Mountain time as Denver keeps it, with MDT in summer.
For a Mountain-based team with West Coast partners, the shared day is long. A 9:00 to 17:00 Mountain day runs 8:00 AM to 4:00 PM Pacific, which the hour-by-hour table shows hour by hour. Only the first hour of the Mountain morning falls before a typical Pacific start of 9:00 AM, which makes this one of the easiest pairs to schedule across.
The date line matters only just after midnight. 12:15 AM Mountain is 11:15 PM the previous day on the Pacific clock, and the result says so. The swap button handles the reverse direction.
Worked examples
Questions about this tool
Is Mountain time ahead of Pacific?
Yes, by one hour. Subtract one hour from Mountain time for Pacific time.
Why do Phoenix and Los Angeles show the same time in summer?
Phoenix does not move its clocks, and Los Angeles moves forward by an hour in spring. The two then match until the autumn change.
What if I only know the time is in Denver?
Use it as the Mountain time. The page shows MST or MDT depending on the date.
Related tools
Where this comes from: IANA time zone database and the rules behind it ยท US Department of Transportation, uniform time and daylight saving time