The best time for a meeting between Boston and Lisbon is inside the overlap of their working days — the hours when both cities are between 09:00 and 17:00 local time. In January the overlap is 0 hours; in July it is 0 hours. This page shows the overlap hour by hour, the best windows, the daylight saving dates that move the overlap, and the scheduling etiquette for this pair of cities.

Try the tool: Meeting Planner — see what time a proposed meeting is in Boston and Lisbon, side by side.

Try the tool: Meeting Time Finder — enter the working hours for Boston and Lisbon and find the overlap automatically.

Overlap between Boston and Lisbon — hour by hour

The table shows every hour from 08:00 to 20:00 in Boston, what time it is in Lisbon, and whether both cities are in their working day (09:00–17:00).

January

Boston time Lisbon time Boston working? Lisbon working? Overlap?
08:00 13:00 No No No
09:00 14:00 Yes No No
10:00 15:00 Yes No No
11:00 16:00 Yes No No
12:00 17:00 Yes No No
13:00 18:00 Yes No No
14:00 19:00 Yes No No
15:00 20:00 Yes No No
16:00 21:00 Yes No No
17:00 22:00 No No No
18:00 23:00 No No No
19:00 00:00 No No No

The best meeting windows

There is no window inside both working days, in January or in July — the difference is too large. The least-bad options are the edges of the day: 08:00 in Boston is 13:00 in Lisbon in January, and 17:00 in Boston is 22:00 in Lisbon. Rotate the early start between the two sides week by week, keep the meeting short, and record it so the side that cannot attend live can catch up. The meeting time finder will confirm that there is no overlap for these two cities, so you can stop looking for one and plan around the edges instead.

Daylight saving and the overlap

Boston observes daylight saving: in 2026 the clocks go forward on 8 March 2026 and back on 1 November 2026, moving the offset from UTC−05:00 to UTC−04:00.

Lisbon observes daylight saving: in 2026 the clocks go forward on 29 March 2026 and back on 25 October 2026, moving the offset from UTC+00:00 to UTC+01:00.

The overlap shifts on Sunday, 8 March 2026 and Sunday, 29 March 2026 and Sunday, 25 October 2026 and Sunday, 1 November 2026 in 2026, when the difference between the cities changes from 5 hours ahead to 4 hours ahead (and again on the later dates). A recurring meeting set in one city's local time will move by an hour on the other side on those dates. Set the calendar event in UTC to avoid it, or check the overlap again after each change. The DST pages — Boston DST 2026 and Lisbon DST 2026 — give the exact dates.

Scheduling etiquette for Boston and Lisbon

Scheduling between the Americas and Europe is the easiest intercontinental case: the difference is 5–9 hours, so the working days overlap for several hours. The best window is late morning in Boston and afternoon in Lisbon (or the reverse), when both sides are in their working day. Watch the three weeks in March when the United States has changed its clocks and Europe has not — the overlap shifts by an hour, and standing meetings land at the wrong time.

A few rules apply to every pair. Avoid Monday mornings and Friday afternoons — they are the edges of the week in every zone, and a meeting there is the first to be skipped. Avoid the weeks when the clocks change — the overlap moves, and a standing meeting lands at the wrong time. Always send the time in UTC as well as in each participant's local time, so nobody has to do the conversion in their head. And if the meeting has to happen outside someone's working hours, rotate it: a team that always meets at 09:00 in Boston is always meeting at 14:00 in Lisbon, and the Lisbon side will quietly disengage if that hour is always theirs to give up.

Worked examples

Three proposed times, worked out for January:

Proposed time In Boston In Lisbon Verdict
09:00 Boston time 09:00 14:00 Inside both working days
12:00 Boston time 12:00 17:00 Outside at least one working day
16:00 Boston time 16:00 21:00 Outside at least one working day

In July, the verdicts are the same. The individual city pages — time in Boston and time in Lisbon — have the working-hours tables for each city.

Boston and Lisbon at a glance

Fact Boston Lisbon
Country United States Portugal
IANA time zone America/New_York Europe/Lisbon
Standard offset UTC−05:00 UTC+00:00
Daylight saving offset UTC−04:00 UTC+01:00
Offset in January 2026 UTC−05:00 UTC+00:00
Offset in July 2026 UTC−04:00 UTC+01:00
Difference in January 5 hours ahead
Difference in July 5 hours ahead

Making it work week to week

There is no overlap between Boston and Lisbon, so a recurring meeting will always cost someone their evening or their early morning. The sustainable answer is to rotate the awkward hour week by week, to keep the meeting short and infrequent — fortnightly rather than weekly where the work allows — and to do as much as possible asynchronously. A decision made in writing can be read by the person who was asleep; a decision made in a meeting has to be re-explained to them. The best global teams meet live only for the things that need live conversation, and write down everything else.

Whatever the overlap, the calendar mechanics are the same: set the event in UTC, not in local time, so it moves correctly when the clocks change; include the local time for each city in the invitation body; and re-check the overlap in March and October, when the difference moves. The meeting time finder finds the overlap for a whole team, and the time difference calculator works out the difference for any date.

Frequently asked questions

What is the best time for a meeting between Boston and Lisbon?

There is no hour inside both working days. Meet at the edge of the day and rotate the awkward hour.

How many hours overlap between Boston and Lisbon?

In January the working days overlap for 0 hours; in July for 0 hours.

What time is it in Lisbon when it is 09:00 in Boston?

It is 14:00 in January and 14:00 in July.

Does the overlap between Boston and Lisbon change during the year?

No. The difference is 5 hours ahead all year, so the overlap never moves.

What is the time difference between Boston and Lisbon?

Lisbon is 5 hours ahead Boston in January and 5 hours ahead Boston in July. Use the time zone converter for the full comparison.

Sources

  • IANA Time Zone Database, via Node.js Intl (Intl.DateTimeFormat with timeZone) — offsets, daylight saving dates and local times in this article were worked out from the IANA database, not typed from memory.
  • TimeFlow's own time-zone data (data/cities.ts, data/dst.ts), computed from the IANA database.
  • TimeFlow's meeting planner and meeting time finder — the live tools behind the numbers on this page.
  • Time-zone and daylight saving rules are set by governments and can change. For flights, deadlines and meetings that cannot move, confirm the time with an official source.