Casper, WY to Seattle, WA: time difference
Seattle, WA is 1 h behind Casper, WY. 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.
Casper, WY 15:07 3:07 PM Seattle, WA 14:07 2:07 PM You –:–
15:07 3:07 PM
Mountain Daylight Time · UTC-6
☀️ 07:23 · 🌙 18:19
14:07 2:07 PM
Pacific Daylight Time · UTC-7
☀️ 07:33 · 🌙 18:17
·
−1 h
Seattle, WA is 1 h behind Casper, WY.
When you, Casper, WY and Seattle, WA are all at the desk
Pick the working hours below – the window every location shares appears once your time zone is known.
Working hours
🇺🇸 Casper, WY
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
🇺🇸 Seattle, WA
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 | 🇺🇸 Casper, WY | 🇺🇸 Seattle, WA |
|---|---|---|
| Local time | 15:07 | 14:07 |
| Local date | Sunday, October 18, 2026 | Sunday, October 18, 2026 |
| Time zone | Mountain Daylight Time | Pacific Daylight Time |
| UTC offset | UTC-6 | UTC-7 |
| Offset from Casper, WY | — | −1 h |
| IANA zone | America/Denver | America/Los Angeles |
| Daylight saving | On summer time → UTC-7, Nov 1, 01:00 | On summer time → UTC-8, Nov 1, 01:00 |
| Sunrise | 07:23 | 07:33 |
| Sunset | 18:19 | 18:17 |
| Daylight | 10 h 57 min | 10 h 44 min |
| People on this clock | 58,763 | 737,015 |
Compare Casper, WY with another city
More comparisons with Casper, WY: the time zones next to it and the far side of the clock.
Nearby time zones
Big time differences
Casper, WY and Seattle, WA: common questions
How far behind Casper, WY, is Seattle, WA?
Seattle is 1 hour behind Casper: UTC−7 against UTC−6.
If it is 9:00 AM in Casper, WY, what time is it in Seattle, WA?
At 9:00 AM in Casper, clocks in Seattle show 8:00 AM.
If it is 6:00 PM in Casper, WY, what time is it in Seattle, WA?
At 6:00 PM in Casper, clocks in Seattle show 5:00 PM.
Is there a time when both Casper, WY, and Seattle, WA, are at work?
Yes: from 10:00 AM to 6:00 PM in Casper (9:00 AM to 5:00 PM in Seattle), the working days (9:00 AM–6:00 PM) overlap.
When does the date change in Seattle, WA, compared with Casper, WY?
The new day starts in Seattle later: until 1:00 AM in Casper, it is still the previous day there. From 11:00 PM in Seattle, Casper is already on the next day.
Is the time difference between Casper, WY, and Seattle, WA, the same all year?
Yes. Both places switch to summer time and back on the same dates, so the gap remains 1 hour.
