What is the ISO week number in O'Fallon?

TimeDials shows the current ISO week number for O'Fallon 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 O'Fallon observe daylight saving time (DST)?

Yes, O'Fallon observes daylight saving time. The next clock change is on 2026-11-01 (clocks move back to GMT-6).

Time in O'Fallon, Illinois, United States — Local Time & Date

Live

--:--:--

Current local time in 🇺🇸 O'Fallon, Illinois, United States.

CST/CDT UTC-05:00

Relative to You

Detecting your timezone…

Relative to UTC

-5 hours behind

Noon here = 17:00 UTC

09:00 here = 14:00 UTC

12:00 here = 17:00 UTC

17:00 here = 22:00 UTC

ISO Week

11 Odd Week

Sun

07:13

18:46

Today

O'Fallon is waking up — early risers grab coffee before the day begins. The current offset is UTC-05:00.

Daylight Saving Time

Last Clock Change

2026-03-08

Clocks moved forward to GMT-5

Next Clock Change

2026-11-01

Clocks will move back to GMT-6

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Quick Facts

Country	🇺🇸United States
State / Region	Illinois
Timezone	CST/CDT
UTC Offset	UTC-05:00
DST	Yes — daylight saving time observed
Population	29,002
Elevation	168 m
Sunrise	07:13
Sunset	18:46
Coordinates	38.59°N, -89.91°E

Map

Map data © OpenStreetMap contributors

Time Difference to Major Cities

City	Difference	Local Time
New York	+1h	--:--
Los Angeles	-2h	--:--
London	+5h	--:--
Paris	+6h	--:--
Dubai	+9h	--:--
Mumbai	+10h 30m	--:--
Singapore	+13h	--:--
Tokyo	+14h	--:--
Sydney	+16h	--:--
Sao Paulo	+2h	--:--
Cairo	+7h	--:--
Shanghai	+13h	--:--

Frequently Asked Questions

What are the business hours in O'Fallon?

Standard business hours in O'Fallon are 09:00–17:00 local time (CST/CDT). 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 O'Fallon?

O'Fallon is currently at UTC-05:00. The timezone identifier is CST/CDT. When it is noon in O'Fallon, it is 17:00 UTC. You can embed a live O'Fallon clock on your website.

What ISO week number is it in O'Fallon?

It is currently ISO week 11 (odd week) in O'Fallon. 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 O'Fallon observe daylight saving time?

Yes, O'Fallon observes daylight saving time (DST). The most recent change was on 2026-03-08, when clocks moved forward to GMT-5. The next change is on 2026-11-01, when clocks will move back to GMT-6.