America/Hermosillo time zone

America/Hermosillo is an IANA time zone used in Mexico. It stays on UTC−7 all year.

America/Hermosillo at a glance

UTC offset now	UTC−7
Standard time	UTC−7 (MST)
Abbreviations	MST
Used in	Mexico

Rules of the America/Hermosillo time zone

America/Hermosillo has stayed on UTC−7 since its last daylight saving period in 1998. Software that still applies an old rule will show the wrong time, so keep tz data up to date.

Recent and upcoming changes in America/Hermosillo

Date	Change	New offset
Sunday, April 6, 1997	Clocks go forward 1 hour: 2:00 AM becomes 3:00 AM	UTC−6
Sunday, October 26, 1997	Clocks go back 1 hour: 2:00 AM becomes 1:00 AM	UTC−7
Sunday, April 5, 1998	Clocks go forward 1 hour: 2:00 AM becomes 3:00 AM	UTC−6
Sunday, October 25, 1998	Clocks go back 1 hour for good: 2:00 AM becomes 1:00 AM	UTC−7

Where America/Hermosillo is used

America/Hermosillo is used in Mexico. These are the largest cities in our list that follow it.

Hermosillo

America/Hermosillo compared with other time zones

Differences change during the year when one side moves to or from daylight saving time, so the table shows January and July separately.

City	Time now	Difference now	In January	In July
New York (United States)	--:--	2 h ahead	2 h ahead	3 h ahead
Los Angeles (United States)	--:--	1 h behind	1 h behind	Same time
London (United Kingdom)	--:--	7 h ahead	7 h ahead	8 h ahead
Paris (France)	--:--	8 h ahead	8 h ahead	9 h ahead
Dubai (United Arab Emirates)	--:--	11 h ahead	11 h ahead	11 h ahead
Mumbai (India)	--:--	12 h 30 min ahead	12 h 30 min ahead	12 h 30 min ahead
Singapore	--:--	15 h ahead	15 h ahead	15 h ahead
Tokyo (Japan)	--:--	16 h ahead	16 h ahead	16 h ahead
Sydney (Australia)	--:--	18 h ahead	18 h ahead	17 h ahead
UTC	--:--	7 h ahead	7 h ahead	7 h ahead

Other zones on UTC−7 right now

These IANA zones show the same time as America/Hermosillo today. Their clock-change rules may differ.

Using America/Hermosillo in software

Store and send the zone as its IANA name, America/Hermosillo, not as a fixed offset. A fixed offset such as UTC−7 gives the wrong result after the next clock change.

Show the current time in America/Hermosillo:

// JavaScript
new Intl.DateTimeFormat('en-GB', { timeZone: 'America/Hermosillo', timeStyle: 'long' }).format(new Date());
# Python
from datetime import datetime
from zoneinfo import ZoneInfo
datetime.now(ZoneInfo('America/Hermosillo'))
// PHP
(new DateTime('now', new DateTimeZone('America/Hermosillo')))->format('c');
# Shell
TZ=America/Hermosillo date

Tools for time in America/Hermosillo

Convert a time to or from America/Hermosillo: pick a date and time and see it in every city on your list.
Add Hermosillo to your world clock to keep it next to your own time.
Find a meeting time that falls inside office hours in America/Hermosillo and the other cities you work with.
Open a full-screen clock for your own time zone.

Frequently asked questions

What is the UTC offset of America/Hermosillo?

UTC−7, all year.

What abbreviation does America/Hermosillo use?

MST. Abbreviations are not unique, so use the zone name America/Hermosillo in software.

Time zone rules: IANA tz database, version 2026e. Place names and coordinates: GeoNames. Sunrise and sunset are calculated from the coordinates and can differ by a minute or two from local almanacs.