San Jose to Naperville, IL: time difference
Naperville, 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 15:45 3:45 PM Naperville, IL 16:45 4:45 PM You –:–
15:45 3:45 PM
Central Standard Time · UTC-6
☀️ 05:26 · 🌙 17:18
16:45 4:45 PM
Central Daylight Time · UTC-5
☀️ 07:11 · 🌙 18:05
·
+1 h
Naperville, IL is 1 h ahead of San Jose.
When you, San Jose and Naperville, 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
🇺🇸 Naperville, 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
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Time zones side by side
| Detail | 🇨🇷 San Jose | 🇺🇸 Naperville, IL |
|---|---|---|
| Local time | 15:45 | 16:45 |
| 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 | 07:11 |
| Sunset | 17:18 | 18:05 |
| Daylight | 11 h 52 min | 10 h 54 min |
| People on this clock | 342,188 | 149,540 |
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 Naperville, IL: common questions
What is the time difference between San Jose and Naperville, IL?
Naperville is 1 hour ahead: it uses UTC−5, while San Jose is on UTC−6.
If it is 9:00 AM in San Jose, what time is it in Naperville, IL?
At 9:00 AM in San Jose, clocks in Naperville show 10:00 AM.
If it is 6:00 PM in San Jose, what time is it in Naperville, IL?
At 6:00 PM in San Jose, clocks in Naperville show 7:00 PM.
Is there a time when both San Jose and Naperville, IL, are at work?
Yes: from 9:00 AM to 5:00 PM in San Jose (10:00 AM to 6:00 PM in Naperville), the working days (9:00 AM–6:00 PM) overlap.
When does the date change in Naperville, IL, compared with San Jose?
The new day starts in Naperville earlier: at 11:00 PM in San Jose it is already midnight there. Until 1:00 AM in Naperville, San Jose is still on the previous day.
Does the time difference between San Jose and Naperville, IL, change?
Yes. The clocks change only in Naperville. From November 1, 2026, Naperville and San Jose will have the same time.
