Lisbon is 5 hours ahead of Boston for most of the year. If you are both awake 7 am to 11 pm, a January weekday gives you 11 hours awake at the same time, and 1 hour of those are outside a 9-to-5 for both of you. Here are the good ones.
Lisbon is 5 hours ahead of Boston that week. On a weekday you are both awake for 11 hours, and 1 hour of those are outside work for both of you.
Worked out for the week of 11 January 2027 (11 Jan – 17 Jan), in Boston time, with each zone’s own daylight-saving rules for those dates. Lisbon awake 7 am – 11 pm, working 9 am – 5 pm weekdays; Boston awake 7 am – 11 pm, working 9 am – 5 pm weekdays.
A weekday, in Boston timeboth awake
Bostonawake 7 am – 11 pm
Lisbonawake 7 am – 6 pm and 2 – 7 am Boston time
7a10a1p4p7p10p1a4a7a
Best on a weekday
noon – 2 pm Boston
5 – 7 pm Lisbon · Boston lunchtime, Lisbon early evening · during Boston’s lunch break
Another weekday option
7 – 9 am Boston
noon – 2 pm Lisbon · Boston morning, Lisbon lunchtime · during Lisbon’s lunch break
The long weekend call
Sat 1 – 4 pm Boston
Sat 6 – 9 pm Lisbon · Boston lunchtime, Lisbon early evening
The week · Boston time, 11 Jan – 17 Jan
7a
8a
9a
10a
11a
12p
1p
2p
3p
4p
5p
6p
7p
8p
9p
10p
Mon
12p
1p
2p
3p
4p
5p
6p
7p
8p
9p
10p
11p
12a
1a
2a
3a
Tue
12p
1p
2p
3p
4p
5p
6p
7p
8p
9p
10p
11p
12a
1a
2a
3a
Wed
12p
1p
2p
3p
4p
5p
6p
7p
8p
9p
10p
11p
12a
1a
2a
3a
Thu
12p
1p
2p
3p
4p
5p
6p
7p
8p
9p
10p
11p
12a
1a
2a
3a
Fri
12p
1p
2p
3p
4p
5p
6p
7p
8p
9p
10p
11p
12a
1a
2a
3a
Sat
12p
1p
2p
3p
4p
5p
6p
7p
8p
9p
10p
11p
12a
1a
2a
3a
Sun
12p
1p
2p
3p
4p
5p
6p
7p
8p
9p
10p
11p
12a
1a
2a
3a
Columns are Boston hours; the small figure in each cell is the time in Lisbon. both freeboth awake, one at workLisbon asleep
The Lisbon–Boston gap through 2027
Dates
Difference
1 January – 13 March
Lisbon is 5 hours ahead of Boston
14 March – 27 March
Lisbon is 4 hours ahead of Boston
28 March – 30 October
Lisbon is 5 hours ahead of Boston
31 October – 6 November
Lisbon is 4 hours ahead of Boston
7 November – 31 December
Lisbon is 5 hours ahead of Boston
The week grid and call windows were worked out for 11 Jan to 17 Jan 2027 with the IANA time-zone rules for Europe/Lisbon (Lisbon) and America/New_York (Boston). That week both places are on standard time. The table uses the same rules for every day of 2027. The finder above recalculates for the current week in your browser.
When it is … in Boston
In Boston
In Lisbon
7 am
noon
9 am
2 pm
11 am
4 pm
1 pm
6 pm
3 pm
8 pm
5 pm
10 pm
7 pm
midnight (next day)
9 pm
2 am (next day)
Wednesday times. Send times as “your 8 pm” or “my 8 pm” so nobody has to guess whose clock you mean.
Stop doing the math every day
The Long Goodbye keeps your person’s local time and time of day on your home-screen widget and lock screen, so you can see whether it is morning coffee or midnight in Lisbon before you call. A “thinking of you” tap lights up their widget, and a countdown keeps the next visit in view.
What is the time difference between Lisbon and Boston?
Lisbon is 5 hours ahead of Boston for most of the year. Because the two places change their clocks on different dates, the gap is 4 hours from 14 March to 27 March and from 31 October to 6 November 2027.
What is the best time to call Lisbon from Boston?
In January, the easiest two hours on a weekday are noon – 2 pm Boston, which is 5 – 7 pm Lisbon: Boston lunchtime, Lisbon early evening, during Boston’s lunch break. At the weekend, Sat 1 – 4 pm Boston (Sat 6 – 9 pm Lisbon) gives you a longer call. Change the awake and work hours in the finder on this page to fit your own days.
How many waking hours do Lisbon and Boston share?
If both of you are awake from 7 am to 11 pm, you share 11 hours on a January weekday, and 1 hour of them fall outside 9-to-5 working hours in both places.
Does daylight saving time change the call times?
Yes. In 2027 Boston changes its clocks on 14 March and 7 November and Lisbon changes its clocks on 28 March and 31 October, so a call you keep at the same time in Boston moves by an hour in Lisbon on those dates. Check the table on this page and agree the new time out loud after each change.