Seattle, WA to Waltham, MA: time difference
Waltham, MA is 3 h ahead of Seattle, WA. 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.
Seattle, WA 07:06 7:06 AM Waltham, MA 10:06 10:06 AM You –:–
07:06 7:06 AM
Pacific Daylight Time · UTC-7
☀️ 07:33 · 🌙 18:17
10:06 10:06 AM
Eastern Daylight Time · UTC-4
☀️ 07:02 · 🌙 18:00
·
+3 h
Waltham, MA is 3 h ahead of Seattle, WA.
When you, Seattle, WA and Waltham, MA are all at the desk
Pick the working hours below – the window every location shares appears once your time zone is known.
Working hours
🇺🇸 Seattle, WA
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
🇺🇸 Waltham, MA
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 1 1 AM 2 2 AM
📍 Your time
- Asleep
- Early
- Working hours
- Evening
- Both working
- Right now
Time zones side by side
| Detail | 🇺🇸 Seattle, WA | 🇺🇸 Waltham, MA |
|---|---|---|
| Local time | 07:06 | 10:06 |
| Local date | Sunday, October 18, 2026 | Sunday, October 18, 2026 |
| Time zone | Pacific Daylight Time | Eastern Daylight Time |
| UTC offset | UTC-7 | UTC-4 |
| Offset from Seattle, WA | — | +3 h |
| IANA zone | America/Los Angeles | America/New York |
| Daylight saving | On summer time → UTC-8, Nov 1, 01:00 | On summer time → UTC-5, Nov 1, 01:00 |
| Sunrise | 07:33 | 07:02 |
| Sunset | 18:17 | 18:00 |
| Daylight | 10 h 44 min | 10 h 58 min |
| People on this clock | 737,015 | 60,636 |
Compare Seattle, WA with another city
More comparisons with Seattle, WA: the time zones next to it and the far side of the clock.
Nearby time zones
Big time differences
Seattle, WA and Waltham, MA: common questions
How far ahead of Seattle, WA, is Waltham, MA?
Waltham is 3 hours ahead of Seattle: UTC−4 against UTC−7.
If it is 9:00 AM in Seattle, WA, what time is it in Waltham, MA?
At 9:00 AM in Seattle, clocks in Waltham show 12:00 PM.
If it is 6:00 PM in Seattle, WA, what time is it in Waltham, MA?
At 6:00 PM in Seattle, clocks in Waltham show 9:00 PM.
When is a good time to call Waltham, MA, from Seattle, WA?
Between 9:00 AM and 3:00 PM in Seattle – that is 12:00 PM to 6:00 PM in Waltham – both places are within working hours (9:00 AM–6:00 PM).
When does the date change in Waltham, MA, compared with Seattle, WA?
The new day starts in Waltham earlier: at 9:00 PM in Seattle it is already midnight there. Until 3:00 AM in Waltham, Seattle is still on the previous day.
Does the time difference between Seattle, WA, and Waltham, MA, change?
No. The clocks in Seattle and in Waltham change on the same dates, so the difference stays 3 hours.
