What is the ISO week number in Chelmsford?

TimeDials shows the current ISO week number for Chelmsford in real time. ISO week numbers follow the ISO 8601 standard, where week 1 is the week containing the first Thursday of the year.

Does Chelmsford observe daylight saving time (DST)?

Yes, Chelmsford observes daylight saving time. The next clock change is on 2026-11-01 (clocks move back to GMT-5).

Time in Chelmsford, Massachusetts, United States — Local Time & Date

Live

--:--:--

Current local time in 🇺🇸 Chelmsford, Massachusetts, United States.

EST/EDT UTC-04:00

Relative to You

Detecting your timezone…

Relative to UTC

-4 hours behind

Noon here = 16:00 UTC

09:00 here = 13:00 UTC

12:00 here = 16:00 UTC

17:00 here = 21:00 UTC

ISO Week

11 Odd Week

Sun

07:01

18:30

Today

Chelmsford is waking up — early risers grab coffee before the day begins. The current offset is UTC-04:00.

Daylight Saving Time

Last Clock Change

2026-03-08

Clocks moved forward to GMT-4

Next Clock Change

2026-11-01

Clocks will move back to GMT-5

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Quick Facts

Country	🇺🇸United States
State / Region	Massachusetts
Timezone	EST/EDT
UTC Offset	UTC-04:00
DST	Yes — daylight saving time observed
Population	33,925
Elevation	88 m
Sunrise	07:01
Sunset	18:30
Coordinates	42.60°N, -71.37°E

Map

Map data © OpenStreetMap contributors

Time Difference to Major Cities

City	Difference	Local Time
Los Angeles	-3h	--:--
London	+4h	--:--
Paris	+5h	--:--
Dubai	+8h	--:--
Mumbai	+9h 30m	--:--
Singapore	+12h	--:--
Tokyo	+13h	--:--
Sydney	+15h	--:--
Sao Paulo	+1h	--:--
Cairo	+6h	--:--
Shanghai	+12h	--:--

Frequently Asked Questions

What are the business hours in Chelmsford?

Standard business hours in Chelmsford are 09:00–17:00 local time (EST/EDT). Check the live clock above to see the current local time. Use our Time Zone Planner to find the best meeting time across cities.

What is the UTC offset for Chelmsford?

Chelmsford is currently at UTC-04:00. The timezone identifier is EST/EDT. When it is noon in Chelmsford, it is 16:00 UTC. You can embed a live Chelmsford clock on your website.

What ISO week number is it in Chelmsford?

It is currently ISO week 11 (odd week) in Chelmsford. ISO week numbers follow the ISO 8601 standard, where week 1 is the week containing the first Thursday of the year. Learn more about ISO week numbers.

Does Chelmsford observe daylight saving time?

Yes, Chelmsford observes daylight saving time (DST). The most recent change was on 2026-03-08, when clocks moved forward to GMT-4. The next change is on 2026-11-01, when clocks will move back to GMT-5.