MST to EST
Denver to New York.
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All date & timeQuestions
What time is EST when it is 12:00 MST?
14:00. Eastern Time is 2 hours ahead of Mountain Time, all year round. A 9-to-5 day in Denver overlaps a 9-to-5 day in New York for 6 hours, between 09:00 and 15:00 MST.
Is the difference between MST and EST the same all year?
Yes. Eastern Time is 2 hours ahead of Mountain Time, all year round. Both zones change their clocks, and close enough to the same dates that the gap between them holds — apart from a week or two each spring and autumn when one has shifted and the other has not.
What do MST and EST actually stand for?
MST is Mountain Time, the zone covering Denver, currently UTC−7 in January. EST is Eastern Time, covering New York, at UTC−5. Arizona sits in this zone but does not change its clocks, so for eight months of the year Phoenix matches Los Angeles rather than Denver. It is the most common source of a missed call in North American scheduling.
Anything worth knowing about Eastern Time?
Strictly, EST is winter only — from March to November the same clocks read EDT, an hour ahead. Almost everyone writing 'EST' means Eastern Time year-round, which is how this page reads it. It covers New York, Toronto, Atlanta and Miami.
When is a good time to call between Denver and New York?
A 9-to-5 day in Denver overlaps a 9-to-5 day in New York for 6 hours, between 09:00 and 15:00 MST. If the call has to happen outside that, the fairer arrangement is usually to alternate which side takes the awkward hour rather than always asking the same one.
How it works, and more about mst → est
The difference, and whether you can rely on it
In January, Eastern Time is 2 hours ahead of Mountain Time — UTC−7 against UTC−5. It stays that way all year, so the number is worth memorising if you work across these two often.
When you can both be at a desk
A standard working day in Denver overlaps one in New York between 09:00 and 15:00 MST — 6 hours. Anything outside that asks somebody to start early or finish late.
Reading the abbreviations literally will mislead you
MST strictly means one fixed offset, but almost nobody uses it that way. People write it to mean the time in Denver, which shifts if that city observes daylight saving — and it does. This page follows the common usage rather than the strict one, because the strict reading gives an answer that is wrong for a good part of the year.
Arizona sits in this zone but does not change its clocks, so for eight months of the year Phoenix matches Los Angeles rather than Denver. It is the most common source of a missed call in North American scheduling. Strictly, EST is winter only — from March to November the same clocks read EDT, an hour ahead. Almost everyone writing 'EST' means Eastern Time year-round, which is how this page reads it. It covers New York, Toronto, Atlanta and Miami.
Scheduling something recurring
For a one-off, the converter above is the whole job. For a standing meeting across zones it is worth putting the invitation in a calendar that stores the zone rather than the time — then the changeover is handled for you and nobody has to remember. If you are trying to find a slot across more than two places at once, the meeting planner shows a whole day at a glance instead.