Alton, IL to Monterrey: time difference
Monterrey is 1 h behind Alton, IL. 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.
Alton, IL 19:49 7:49 PM Monterrey 18:49 6:49 PM You –:–
19:49 7:49 PM
Central Daylight Time · UTC-5
☀️ 07:16 · 🌙 18:17
18:49 6:49 PM
Central Standard Time · UTC-6
☀️ 06:43 · 🌙 18:10
·
−1 h
Monterrey is 1 h behind Alton, IL.
When you, Alton, IL and Monterrey are all at the desk
Pick the working hours below – the window every location shares appears once your time zone is known.
Working hours
🇺🇸 Alton, IL
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
🇲🇽 Monterrey
23 11 PM 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
📍 Your time
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Time zones side by side
| Detail | 🇺🇸 Alton, IL | 🇲🇽 Monterrey |
|---|---|---|
| Local time | 19:49 | 18:49 |
| Local date | Tuesday, October 20, 2026 | Tuesday, October 20, 2026 |
| Time zone | Central Daylight Time | Central Standard Time |
| UTC offset | UTC-5 | UTC-6 |
| Offset from Alton, IL | — | −1 h |
| IANA zone | America/Chicago | America/Monterrey |
| Daylight saving | On summer time → UTC-6, Nov 1, 01:00 | Not observed |
| Sunrise | 07:16 | 06:43 |
| Sunset | 18:17 | 18:10 |
| Daylight | 11 h 1 min | 11 h 27 min |
| People on this clock | 25,676 | 1,142,994 |
Compare Alton, IL with another city
More comparisons with Alton, IL: the time zones next to it and the far side of the clock.
Nearby time zones
Big time differences
Alton, IL and Monterrey: common questions
How far behind Alton, IL, is Monterrey?
Monterrey is 1 hour behind Alton: UTC−6 against UTC−5.
If it is 9:00 AM in Alton, IL, what time is it in Monterrey?
At 9:00 AM in Alton, clocks in Monterrey show 8:00 AM.
What time is it in Monterrey at the end of the working day in Alton, IL?
The working day in Alton ends at 6:00 PM; in Monterrey it is 5:00 PM at that moment.
When is a good time to call Monterrey from Alton, IL?
Between 10:00 AM and 6:00 PM in Alton – that is 9:00 AM to 5:00 PM in Monterrey – both places are within working hours (9:00 AM–6:00 PM).
Until what time in Alton, IL, is it still yesterday in Monterrey?
Before 1:00 AM in Alton, the date in Monterrey has not changed yet. From 11:00 PM in Monterrey, it is already the next day in Alton.
Does the time difference between Alton, IL, and Monterrey change?
Yes. The clocks change only in Alton. From November 1, 2026, Monterrey and Alton will have the same time.
