Waltham, MA to Seattle, WA: time difference
Seattle, WA is 3 h behind Waltham, MA. 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.
Waltham, MA 07:30 7:30 AM Seattle, WA 04:30 4:30 AM You –:–
07:30 7:30 AM
Eastern Daylight Time · UTC-4
☀️ 07:02 · 🌙 18:00
04:30 4:30 AM
Pacific Daylight Time · UTC-7
☀️ 07:33 · 🌙 18:17
·
−3 h
Seattle, WA is 3 h behind Waltham, MA.
When you, Waltham, MA 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
🇺🇸 Waltham, MA
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
21 9 PM 22 10 PM 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
📍 Your time
- Asleep
- Early
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Time zones side by side
| Detail | 🇺🇸 Waltham, MA | 🇺🇸 Seattle, WA |
|---|---|---|
| Local time | 07:30 | 04:30 |
| Local date | Sunday, October 18, 2026 | Sunday, October 18, 2026 |
| Time zone | Eastern Daylight Time | Pacific Daylight Time |
| UTC offset | UTC-4 | UTC-7 |
| Offset from Waltham, MA | — | −3 h |
| IANA zone | America/New York | America/Los Angeles |
| Daylight saving | On summer time → UTC-5, Nov 1, 01:00 | On summer time → UTC-8, Nov 1, 01:00 |
| Sunrise | 07:02 | 07:33 |
| Sunset | 18:00 | 18:17 |
| Daylight | 10 h 58 min | 10 h 44 min |
| People on this clock | 60,636 | 737,015 |
Compare Waltham, MA with another city
More comparisons with Waltham, MA: the time zones next to it and the far side of the clock.
Nearby time zones
Big time differences
Waltham, MA and Seattle, WA: common questions
How many hours behind Waltham, MA, is Seattle, WA?
The clocks in Seattle are 3 hours behind those in Waltham (UTC−7 and UTC−4).
What time is it in Seattle, WA, when it is 9:00 AM in Waltham, MA?
When it is 9:00 AM in Waltham, it is 6:00 AM in Seattle.
If it is 6:00 PM in Waltham, MA, what time is it in Seattle, WA?
At 6:00 PM in Waltham, clocks in Seattle show 3:00 PM.
When is a good time to call Seattle, WA, from Waltham, MA?
Between 12:00 PM and 6:00 PM in Waltham – that is 9:00 AM to 3:00 PM in Seattle – both places are within working hours (9:00 AM–6:00 PM).
When is it still the previous day in Seattle, WA?
Until 3:00 AM in Waltham, MA, it is still the previous day in Seattle. The other way round, from 9:00 PM in Seattle it is already the next day in Waltham.
Does the time difference between Waltham, MA, and Seattle, WA, change?
No. The clocks in Waltham and in Seattle change on the same dates, so the difference stays 3 hours.
