San Jose to Alton, IL: time difference
Alton, IL is 1 h ahead of San Jose. 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.
San Jose 15:30 3:30 PM Alton, IL 16:30 4:30 PM You –:–
15:30 3:30 PM
Central Standard Time · UTC-6
☀️ 05:26 · 🌙 17:18
16:30 4:30 PM
Central Daylight Time · UTC-5
☀️ 07:16 · 🌙 18:17
·
+1 h
Alton, IL is 1 h ahead of San Jose.
When you, San Jose and Alton, 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
🇨🇷 San Jose
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
🇺🇸 Alton, 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
- Asleep
- Early
- Working hours
- Evening
- Both working
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Time zones side by side
| Detail | 🇨🇷 San Jose | 🇺🇸 Alton, IL |
|---|---|---|
| Local time | 15:30 | 16:30 |
| Local date | Tuesday, October 20, 2026 | Tuesday, October 20, 2026 |
| Time zone | Central Standard Time | Central Daylight Time |
| UTC offset | UTC-6 | UTC-5 |
| Offset from San Jose | — | +1 h |
| IANA zone | America/Costa Rica | America/Chicago |
| Daylight saving | Not observed | On summer time → UTC-6, Nov 1, 01:00 |
| Sunrise | 05:26 | 07:16 |
| Sunset | 17:18 | 18:17 |
| Daylight | 11 h 52 min | 11 h 1 min |
| People on this clock | 342,188 | 25,676 |
Compare San Jose with another city
More comparisons with San Jose: the time zones next to it and the far side of the clock.
Nearby time zones
Big time differences
San Jose and Alton, IL: common questions
What is the time difference between San Jose and Alton, IL?
Alton is 1 hour ahead: it uses UTC−5, while San Jose is on UTC−6.
What time is it in Alton, IL, at the start of the working day in San Jose?
The working day in San Jose starts at 9:00 AM; in Alton it is 10:00 AM at that moment.
What time is it in Alton, IL, when it is 6:00 PM in San Jose?
When it is 6:00 PM in San Jose, it is 7:00 PM in Alton.
When is a good time to call Alton, IL, from San Jose?
Between 9:00 AM and 5:00 PM in San Jose – that is 10:00 AM to 6:00 PM in Alton – both places are within working hours (9:00 AM–6:00 PM).
When is it already the next day in Alton, IL?
From 11:00 PM in San Jose it is already the next day in Alton. The other way round, until 1:00 AM in Alton it is still the previous day in San Jose.
Is the time difference between San Jose and Alton, IL, the same all year?
No. Only Alton switches to summer time, so the gap changes twice a year. From November 1, 2026, Alton and San Jose will have the same time.
