MST to EDT Converter

Category: Time Zone Converters

- July 02, 2025

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Mountain Standard Time (MST)

UTC-7 • Phoenix, Denver, Calgary

Conversion Settings

Configure your timezone conversion preferences

Auto Convert

Daylight Saving Aware

Show UTC Offset

Show Seconds

Eastern Daylight Time (EDT)

UTC-4 • New York, Toronto, Miami

--:--:--

Select a time to convert

Time Difference: --

UTC Offset (MST): -7

UTC Offset (EDT): -4

DST Status: --

MST Time: --

EDT Time: --

Time Format:

Current MST: --:--:--

Current EDT: --:--:--

🌍 MST is UTC-7 (winter standard time). EDT is UTC-4 (summer daylight time). EDT is always 3 hours ahead of MST.

MST to EDT Conversion Guide

What is MST to EDT Conversion?

MST to EDT conversion helps you translate time between Mountain Standard Time and Eastern Daylight Time. MST is UTC-7 and is observed during winter months in mountain regions. EDT is UTC-4 and is observed during summer months in eastern regions. The time difference is consistently 3 hours, with EDT being ahead of MST.

Time Zone Information

Mountain Standard Time (MST): Used in western United States and parts of Canada during winter months. Always UTC-7 from November to March.

Eastern Daylight Time (EDT): Used in eastern United States and parts of Canada during summer months. Always UTC-4 from March to November.

Time Difference: EDT is consistently 3 hours ahead of MST throughout their respective periods.

Daylight Saving Time Impact

MST Period: Observed from first Sunday in November to second Sunday in March during winter months

EDT Period: Observed from second Sunday in March to first Sunday in November during summer months

Overlap Consideration: These time zones represent different seasonal periods but maintain a constant 3-hour difference

Common Conversion Examples

Business Hours

MST 9:00 AM → EDT 12:00 PM

MST 5:00 PM → EDT 8:00 PM

Standard business day conversion

Meeting Coordination

MST 10:00 AM → EDT 1:00 PM

MST 2:00 PM → EDT 5:00 PM

Cross-country scheduling

System Timestamps

MST 12:00 AM → EDT 3:00 AM

MST 11:59 PM → EDT 2:59 AM (next day)

Midnight boundary handling

Travel & Events

MST 6:00 AM → EDT 9:00 AM

MST 8:00 PM → EDT 11:00 PM

Flight and event scheduling

Conversion Tips & Best Practices

• MST is specifically winter mountain time; MDT (UTC-6) is used during summer

• EDT is specifically summer eastern time; EST (UTC-5) is used during winter

• Always add 3 hours to MST to get EDT time

• EDT dates may change when converting late evening MST times

• Best meeting overlap is MST morning hours (9AM-3PM) with EDT afternoon (12PM-6PM)

• Consider seasonal appropriateness when scheduling between these specific time standards

Convert Between MST and EDT

If you're trying to sync up between Mountain Standard Time and Eastern Daylight Time, this tool takes the guesswork out of the process. Below is a breakdown of which countries fall into each time zone. This gives you a better sense of how these regions line up before you jump into scheduling anything important.

Mountain Standard Time (UTC-7)	Eastern Daylight Time (UTC-4)
🇺🇸 United States (Parts: Arizona, Colorado, Montana, Utah, New Mexico, Wyoming) 🇨🇦 Canada (Parts: Alberta, parts of British Columbia, Northwest Territories) 🇲🇽 Mexico (State of Sonora)	🇺🇸 United States (Parts: New York, Florida, Georgia, North Carolina, Ohio, Pennsylvania, etc.) 🇨🇦 Canada (Parts: Ontario, Quebec, Nova Scotia, Prince Edward Island) 🇧🇸 Bahamas 🇧🇧 Barbados 🇧🇿 Belize (Summer daylight usage varies) 🇨🇺 Cuba 🇩🇲 Dominica 🇩🇴 Dominican Republic 🇬🇩 Grenada 🇬🇹 Guatemala (if observing daylight savings) 🇭🇹 Haiti 🇯🇲 Jamaica 🇰🇳 Saint Kitts and Nevis 🇱🇨 Saint Lucia 🇻🇨 Saint Vincent and the Grenadines 🇹🇹 Trinidad and Tobago 🇻🇮 U.S. Virgin Islands

Mountain Standard Time (UTC-7)

Eastern Daylight Time (UTC-4)

🇺🇸 United States (Parts: Arizona, Colorado, Montana, Utah, New Mexico, Wyoming)

🇨🇦 Canada (Parts: Alberta, parts of British Columbia, Northwest Territories)

🇲🇽 Mexico (State of Sonora)

🇺🇸 United States (Parts: New York, Florida, Georgia, North Carolina, Ohio, Pennsylvania, etc.)

🇨🇦 Canada (Parts: Ontario, Quebec, Nova Scotia, Prince Edward Island)

🇧🇸 Bahamas

🇧🇧 Barbados

🇧🇿 Belize (Summer daylight usage varies)

🇨🇺 Cuba

🇩🇲 Dominica

🇩🇴 Dominican Republic

🇬🇩 Grenada

🇬🇹 Guatemala (if observing daylight savings)

🇭🇹 Haiti

🇯🇲 Jamaica

🇰🇳 Saint Kitts and Nevis

🇱🇨 Saint Lucia

🇻🇨 Saint Vincent and the Grenadines

🇹🇹 Trinidad and Tobago

🇻🇮 U.S. Virgin Islands

How this time converter keeps it simple

The MST to EDT Time Converter is built to do one thing really well: help you figure out what time it is across two of North America's busiest time zones. Whether you're trying to plan a meeting, book a flight, or check in with someone a few hours ahead, this calculator takes care of the math behind the scenes.

Built for accuracy, even when daylight saving kicks in

One of the most useful things about this tool is how it handles Daylight Saving Time. You don't need to know if Arizona is skipping DST or if New York is in daylight mode. The “Daylight Saving Aware” option does that work for you. Just check that box and it’ll factor in the right offset based on the date you enter.

Quick setup, clear results

Step 1: Choose your base time zone

Start by picking the time zone your time originates from. By default, it's set to MST, but you can switch to EDT using the dropdown menu or the “Swap” button.

Step 2: Enter your date and time

Use the input fields to type in the date and time you want to convert. If you're working from right now, hit the “Now” button and it will auto-fill for you.

Step 3: Click “Convert Time”

Once your time is in, press “Convert Time.” You'll see the result show up immediately below, along with a few helpful details like the UTC offset, whether daylight saving is active, and a side-by-side formatted display.

Optional: Set preferences

You can fine-tune what gets displayed. Show seconds if you're timing things down to the wire, display UTC offsets if you're syncing with servers, or toggle between 12-hour and 24-hour time. If you want the results to update as you type, just turn on “Auto Convert.”

Smart enough to stay current

This tool isn't static. It shows the live time in both MST and EDT right on the page. That’s useful if you’re trying to see where you are right now versus where someone else is. And it updates every second, so you won’t miss a beat.

Real-world use: Coordinating calls between Calgary and Miami

Let’s say you’re based in Calgary, Alberta and you’re planning a call with someone in Miami, Florida. Calgary runs on MST (UTC-7 in winter) and Miami on EDT (UTC-4 in summer). Plug your 10:00 AM meeting time into this tool and it instantly shows 1:00 PM for your Miami contact. That saves back-and-forth emails and guarantees no confusion.

It all comes back to smoother planning

Whether you're working across regions, traveling, or just making sure you call your friend at a decent hour, this MST to EDT converter keeps things clear. No need to calculate offsets or Google if it’s daylight saving time. Just enter the time and go. With this in your toolkit, staying coordinated feels a whole lot easier.