Monterrey to O'Fallon, IL: time difference
O'Fallon, IL is 1 h ahead of Monterrey. Live clocks for both, the working hours they share, and how each one sits against your own time.
Your time
One day, 2 clocks
Drag along the band to read any hour in every place at once.
Monterrey 18:58 6:58 PM O'Fallon, IL 19:58 7:58 PM You –:–
18:58 6:58 PM
Central Standard Time · UTC-6
☀️ 06:44 · 🌙 18:09
19:58 7:58 PM
Central Daylight Time · UTC-5
☀️ 07:15 · 🌙 18:15
·
+1 h
O'Fallon, IL is 1 h ahead of Monterrey.
When you, Monterrey and O'Fallon, IL are all at the desk
Pick the working hours below – the window every location shares appears once your time zone is known.
Working hours
🇲🇽 Monterrey
0 12 AM 1 1 AM 2 2 AM 3 3 AM 4 4 AM 5 5 AM 6 6 AM 7 7 AM 8 8 AM 9 9 AM 10 10 AM 11 11 AM 12 12 PM 13 1 PM 14 2 PM 15 3 PM 16 4 PM 17 5 PM 18 6 PM 19 7 PM 20 8 PM 21 9 PM 22 10 PM 23 11 PM
🇺🇸 O'Fallon, IL
1 1 AM 2 2 AM 3 3 AM 4 4 AM 5 5 AM 6 6 AM 7 7 AM 8 8 AM 9 9 AM 10 10 AM 11 11 AM 12 12 PM 13 1 PM 14 2 PM 15 3 PM 16 4 PM 17 5 PM 18 6 PM 19 7 PM 20 8 PM 21 9 PM 22 10 PM 23 11 PM 0 12 AM
📍 Your time
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Time zones side by side
| Detail | 🇲🇽 Monterrey | 🇺🇸 O'Fallon, IL |
|---|---|---|
| Local time | 18:58 | 19:58 |
| Local date | Wednesday, October 21, 2026 | Wednesday, October 21, 2026 |
| Time zone | Central Standard Time | Central Daylight Time |
| UTC offset | UTC-6 | UTC-5 |
| Offset from Monterrey | — | +1 h |
| IANA zone | America/Monterrey | America/Chicago |
| Daylight saving | Not observed | On summer time → UTC-6, Nov 1, 01:00 |
| Sunrise | 06:44 | 07:15 |
| Sunset | 18:09 | 18:15 |
| Daylight | 11 h 26 min | 10 h 59 min |
| People on this clock | 1,142,994 | 94,074 |
Compare Monterrey with another city
More comparisons with Monterrey: the time zones next to it and the far side of the clock.
Nearby time zones
Big time differences
Monterrey and O'Fallon, IL: common questions
How many hours ahead of Monterrey is O'Fallon, IL?
The clocks in O'Fallon are 1 hour ahead of those in Monterrey (UTC−5 and UTC−6).
What time is it in O'Fallon, IL, when it is 9:00 AM in Monterrey?
When it is 9:00 AM in Monterrey, it is 10:00 AM in O'Fallon.
What time is it in O'Fallon, IL, when it is 6:00 PM in Monterrey?
When it is 6:00 PM in Monterrey, it is 7:00 PM in O'Fallon.
When do working hours in Monterrey and in O'Fallon, IL, overlap?
Working hours (9:00 AM–6:00 PM) overlap from 9:00 AM to 5:00 PM in Monterrey, which is 10:00 AM to 6:00 PM in O'Fallon.
When is it already the next day in O'Fallon, IL?
From 11:00 PM in Monterrey it is already the next day in O'Fallon. The other way round, until 1:00 AM in O'Fallon it is still the previous day in Monterrey.
Is the time difference between Monterrey and O'Fallon, IL, the same all year?
No. Only O'Fallon switches to summer time, so the gap changes twice a year. From November 1, 2026, O'Fallon and Monterrey will have the same time.
