Time Difference US and Portugal
Lisbon is 5 hours ahead of New York. Because the clocks do not change on the same days, the difference is sometimes 4 hours – the table shows when. When it is 12:00 in New York, it is 17:00 in Lisbon.
Time difference US and Portugal to the end of 2027
| Period | Difference |
|---|---|
| 30 Sept 2026 – 24 Oct 2026 | +5 h |
| 24 Oct 2026 – 1 Nov 2026 | +4 h |
| 1 Nov 2026 – 14 Mar 2027 | +5 h |
| 14 Mar 2027 – 27 Mar 2027 | +4 h |
| 27 Mar 2027 – 30 Oct 2027 | +5 h |
| 30 Oct 2027 – 7 Nov 2027 | +4 h |
| 7 Nov 2027 – 31 Dec 2027 | +5 h |
Convert the time: New York → Lisbon
| New York | Lisbon (+4 h) | Lisbon (+5 h) |
|---|---|---|
| 00:00 | 04:00 | 05:00 |
| 02:00 | 06:00 | 07:00 |
| 04:00 | 08:00 | 09:00 |
| 06:00 | 10:00 | 11:00 |
| 08:00 | 12:00 | 13:00 |
| 10:00 | 14:00 | 15:00 |
| 12:00 | 16:00 | 17:00 |
| 14:00 | 18:00 | 19:00 |
| 16:00 | 20:00 | 21:00 |
| 18:00 | 22:00 | 23:00 |
| 20:00 | 00:00 (+1) | 01:00 (+1) |
| 22:00 | 02:00 (+1) | 03:00 (+1) |
(+1) = next day, (−1) = previous day. One column for each difference in the table above.
Time zones in Portugal
| Time zone (example city) | January 2027 | July 2027 |
|---|---|---|
| Western European Time (Lisbon) | +5 h | +5 h |
| Azores Time (Azores) | +4 h | +4 h |
Time zones in US
| Time zone (example city) | January 2027 | July 2027 |
|---|---|---|
| Eastern Time (New York) | ±0 h | ±0 h |
| Central Time (Chicago) | −1 h | −1 h |
| Mountain Time (Denver) | −2 h | −2 h |
| Mountain Standard Time (Phoenix) | −2 h | −3 h |
| Pacific Time (Los Angeles) | −3 h | −3 h |
| Alaska Time (Anchorage) | −4 h | −4 h |
| Hawaii-Aleutian Standard Time (Honolulu) | −5 h | −6 h |
Clock changes in 2027
- US: 14 March (+1 h) and 7 November (−1 h).
- Portugal: 28 March (+1 h) and 31 October (−1 h).
Calculate the time difference between any two countries
How it is calculated
We use the IANA time zone database (tzdata), which browsers and operating systems use as well. For every day the UTC offset of both main zones (New York and Lisbon) is looked up; the difference only changes when one of the countries changes its clocks. In the UK and the EU that happens on the last Sunday of March and October at 01:00 UTC; in the US on the second Sunday of March and the first Sunday of November (15 U.S.C. § 260a).
Limits: countries can change their time rules at short notice; this page shows the time zone database as of the update date. For countries with several time zones the main zone is used; the others are listed in the time zone table.
Frequently asked questions
How many hours is the time difference between the US and Portugal?
Lisbon is 5 hours ahead of New York. At times it is 4 hours, because the clocks change on different days.
What time is it in Lisbon when it is 12 noon in New York?
17:00 – as long as the difference is 5 hours. The conversion table shows every hour.
When does the time difference change?
Up to the end of 2027 on these dates: 24 October 2026: +4 h; 1 November 2026: +5 h; 14 March 2027: +4 h; 27 March 2027: +5 h; 30 October 2027: +4 h; 7 November 2027: +5 h.
Does Portugal observe daylight saving time?
Yes, in 2027: 28 March (+1 h) and 31 October (−1 h).
How many time zones does Portugal have?
Several; this page uses Lisbon. The time zone table shows the difference for 2 zones in January and July.
Time difference US – other countries
Sources
- IANA Time Zone Database (tzdata)
- ECMA-402 – Intl.DateTimeFormat, option timeZone
- EUR-Lex – 2000/84/EC (summer time / Sommerzeit)
- 15 U.S.C. § 260a – daylight saving time in the United States (Cornell LII)
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