Waltham, MA to Montevideo: time difference
Montevideo is 1 h ahead of 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 08:21 8:21 AM Montevideo 09:21 9:21 AM You –:–
08:21 8:21 AM
Eastern Daylight Time · UTC-4
☀️ 07:02 · 🌙 18:00
09:21 9:21 AM
Uruguay Standard Time · UTC-3
☀️ 05:59 · 🌙 19:02
·
+1 h
Montevideo is 1 h ahead of Waltham, MA.
When you, Waltham, MA and Montevideo 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
🇺🇾 Montevideo
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
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Time zones side by side
| Detail | 🇺🇸 Waltham, MA | 🇺🇾 Montevideo |
|---|---|---|
| Local time | 08:21 | 09:21 |
| Local date | Sunday, October 18, 2026 | Sunday, October 18, 2026 |
| Time zone | Eastern Daylight Time | Uruguay Standard Time |
| UTC offset | UTC-4 | UTC-3 |
| Offset from Waltham, MA | — | +1 h |
| IANA zone | America/New York | America/Montevideo |
| Daylight saving | On summer time → UTC-5, Nov 1, 01:00 | Not observed |
| Sunrise | 07:02 | 05:59 |
| Sunset | 18:00 | 19:02 |
| Daylight | 10 h 58 min | 13 h 3 min |
| People on this clock | 60,636 | 1,319,108 |
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 Montevideo: common questions
What is the time difference between Waltham, MA, and Montevideo?
Montevideo is 1 hour ahead: it uses UTC−3, while Waltham is on UTC−4.
If it is 9:00 AM in Waltham, MA, what time is it in Montevideo?
At 9:00 AM in Waltham, clocks in Montevideo show 10:00 AM.
If it is 6:00 PM in Waltham, MA, what time is it in Montevideo?
At 6:00 PM in Waltham, clocks in Montevideo show 7:00 PM.
When do working hours in Waltham, MA, and in Montevideo overlap?
Working hours (9:00 AM–6:00 PM) overlap from 9:00 AM to 5:00 PM in Waltham, which is 10:00 AM to 6:00 PM in Montevideo.
When does the date change in Montevideo compared with Waltham, MA?
The new day starts in Montevideo earlier: at 11:00 PM in Waltham it is already midnight there. Until 1:00 AM in Montevideo, Waltham is still on the previous day.
Is the time difference between Waltham, MA, and Montevideo the same all year?
No. Only Waltham switches to summer time, so the gap changes twice a year. From November 1, 2026, Montevideo will be 2 hours ahead of Waltham.
