ET to MST Converter

Category: Time Zone Converters

- June 30, 2025

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Eastern Time (EDT/EST)

UTC-4/-5 • New York, Washington DC, Atlanta

Conversion Settings

Configure your timezone conversion preferences

Auto Convert

Daylight Saving Aware

Show UTC Offset

Show Seconds

Mountain Standard Time (MDT/MST)

UTC-6/-7 • Denver, Salt Lake City, Phoenix

--:--:--

Select a time to convert

Time Difference: --

UTC Offset (ET): -05:00

UTC Offset (MST): -07:00

DST Status: --

ET Time: --

MST Time: --

Time Format:

Current ET: --:--:--

Current MST: --:--:--

🇺🇸 ET observes daylight saving time (EDT in summer, EST in winter). Most of MST observes daylight saving time (MDT in summer) except Arizona which stays on MST year-round.

ET to MST Conversion Guide

What is ET to MST Conversion?

ET to MST conversion helps you translate time between Eastern Time and Mountain Standard Time zones. Eastern Time switches between EST (UTC-5) in winter and EDT (UTC-4) in summer. Mountain Time typically switches between MST (UTC-7) in winter and MDT (UTC-6) in summer, though Arizona stays on MST year-round. The time difference between these zones is consistently 2 hours, with ET being ahead.

Time Zone Information

Eastern Time (ET): Used in the eastern United States including New York, Washington DC, Atlanta, Miami. Switches between EST (UTC-5) in winter and EDT (UTC-4) in summer with daylight saving time.

Mountain Standard Time (MST): Used in the western United States including Denver, Salt Lake City, Phoenix, Albuquerque. Most areas switch between MST (UTC-7) in winter and MDT (UTC-6) in summer, but Arizona stays on MST year-round.

Time Difference: ET is consistently 2 hours ahead of MST year-round. This makes scheduling between the east and mountain west predictable.

Daylight Saving Time Impact

Eastern Time: Observes daylight saving time - switches from EST to EDT on the second Sunday in March, and from EDT back to EST on the first Sunday in November

Mountain Time: Most areas observe daylight saving time with the same schedule as Eastern Time, switching between MST and MDT. Arizona (except Navajo Nation) stays on MST year-round

Consistent Difference: The 2-hour time difference remains constant because both zones change at the same time, making this a very stable timezone conversion

Common Conversion Examples

Business Hours

ET 9:00 AM → MST 7:00 AM

ET 5:00 PM → MST 3:00 PM

Good overlap for cross-country meetings

Meeting Planning

Best ET Time: 11:00 AM - 3:00 PM

Converts to MST: 9:00 AM - 1:00 PM

Optimal business hours overlap

Travel Planning

ET Departure: 2:00 PM

MST Arrival: 12:00 PM (same day)

Flying west "gains" time

Event Scheduling

ET Midnight: 10:00 PM MST (previous day)

ET Noon: 10:00 AM MST

Always subtract 2 hours from ET

Conversion Tips & Best Practices

• ET is always 2 hours ahead of MST - simply subtract 2 hours from Eastern Time

• Both zones typically change for daylight saving time on the same dates, keeping the 2-hour difference constant

• Arizona stays on MST year-round and doesn't observe daylight saving time

• Best business meeting times are 11 AM - 3 PM ET (9 AM - 1 PM MST)

• Remember that when it's Monday morning in MST, it might already be Monday afternoon in ET

• Double-check if you're dealing with Arizona time, as it doesn't change for daylight saving

Eastern to Mountain Time Converter

Need to match schedules between the East Coast and the Mountain states? This tool does the math for you. Whether you’re planning meetings or keeping track of live events, the Eastern to Mountain Time Converter helps you figure out the time difference without needing to guess or Google every hour shift.

Eastern Time (ET)	Mountain Standard Time (MST)
United States Canada Bahamas Haiti Cayman Islands Jamaica Panama Turks and Caicos Islands	United States Canada Mexico

What the tool actually does

This converter takes a date and time in either Eastern Time or Mountain Time and gives you the matching time in the other zone. It supports daylight saving time, offers both 12-hour and 24-hour formats, and gives you the option to show or hide seconds and UTC offsets. Whether you’re entering a specific time or using the live clock, it does all the zone math instantly.

Why this saves you time (pun intended)

If you've ever tried to book a meeting with someone two hours behind you or double-checked if your Denver flight lands before your NYC departure, you know how confusing time math gets. This tool removes all the second-guessing and keeps you on track with real-world-friendly features like auto-convert and DST toggles.

Here’s how to use it without fumbling

Step 1: Pick your timezone

Start by choosing whether you’re entering a time in Eastern or Mountain Time. Use the dropdown menu near the date and time input. The label above it updates to match your choice.

Step 2: Enter the date and time

You can pick any date and time using the built-in calendar and clock fields. This lets you check past or future events, not just the current moment.

Step 3: Hit convert or use auto mode

By default, “Auto Convert” is turned on, so your result updates as you type. If you prefer to manually trigger it, turn off Auto Convert and click the Convert Time button whenever you’re ready.

Step 4: Read your results

The tool shows the converted time, the date, whether DST is active, the UTC offsets for each zone, and the 2-hour difference. It also shows both formatted clocks side-by-side at the bottom.

Optional: Swap or reset

Click the “Swap” button to flip the direction of conversion. Want to start over? Use the Reset button to clear everything and reset to Eastern Time.

Tips hiding in plain sight

If you only care about hour and minute, uncheck “Show Seconds” for a cleaner view.
Click “Now” to instantly load the current time for the selected timezone.
Switch between 12-hour and 24-hour format with the “Time Format” toggle.
Want to see UTC offset? Turn on “Show UTC Offset” to display them in the result.
Remember Arizona doesn’t observe daylight saving time, so its time might match Pacific Time during summer.

A real-world use case

Let’s say you live in Canada and you’re organizing a video call with a partner in Mexico. You’re in Toronto (Eastern Time) and they’re in Chihuahua (Mountain Time). Just plug in your 3 PM meeting time in ET, and the converter shows it’ll be 1 PM in MST. No more emails with mixed-up times or late arrivals.

Stay sharp when the clock shifts

This tool doesn’t just convert a time, it accounts for the quirks that trip people up. Daylight saving time, time format preferences, and simple swapping all come baked in. Whether you're planning ahead or checking the moment, it keeps the time math straight so you don’t have to.