United States
Time now in O'Fallon
Sunrise 06:19Sunset 07:46Time zone UTC −5
Time zone
America/Chicago
UTC offset
UTC −5
Daylight saving
In effect now
Population
28,281
Sunrise
06:19
Sunset
07:46
Day length
13h 28m
Coordinates
38.60, -89.91
Time difference from O'Fallon
Hours ahead (right) or behind (left) O'Fallon right now.
O'Fallon on the map
About the time in O'Fallon
Around 28,281 people live in O'Fallon, and all of them keep the same civil time, so the reading above applies to the whole urban area — not just the city centre.
O'Fallon runs on America/Chicago, which puts the city UTC −5 from Coordinated Universal Time right now. The clock at the top of this page is not copied from your device: it is anchored to our reference timestamp and re-rendered every second against the IANA time zone database, so it stays right even when a laptop or phone has quietly drifted.
The zone identifier America/Chicago is the value you want in code, calendars and travel systems. Abbreviations change with the season, but America/Chicago keeps pointing at Chicago time whatever the date, which is why every timestamp on this page is built from it.
Frequently asked questions about time in O'Fallon
- Which time zone is O'Fallon in?
- O'Fallon uses America/Chicago, currently UTC −5.
- What time is it in O'Fallon right now?
- The live clock above shows the current time in O'Fallon, updating every second from America/Chicago (UTC −5).
- What are normal business hours in O'Fallon in UTC?
- A 09:00–17:00 working day in O'Fallon runs from 14:00–22:00 UTC today.
- Does O'Fallon change its clocks for daylight saving?
- Yes, and it is in effect now. Clocks change again on 1 November 2026.
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