Portugal has two time zones and observes daylight saving time. Therefore four different UTC offsets are observed. Continental Portugal and Madeira use UTC+00:00 in winter and UTC+01:00 in summer. The Azores use UTC-01:00 in winter and UTC+00:00 in summer.
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In 1911 standard time in Portugal was for the first time in relation to the prime meridian established by the 1884 International Meridian Conference, namely as GMT-00:36:44, which was the local mean time at the Astronomical Observatory of Lisbon. In 1912 this was changed to GMT. In 1916 it changed to GMT+01:00.[1][2]
Portugal observes EU DST rules.
In 1996 Portugal adopted ISO 8601 via EN 28601 as NP EN 28601:1996.[3]
The Astronomical Observatory of Lisbon publishes the official time via the Network Time Protocol (NTP), e.g. via "ntp02.oal.ul.pt" and "ntp04.oal.ul.pt" [4].
The tz database contains 3 zones for Portugal. Columns marked with * are from the file zone.tab from the tz database.
| c.c.* | coordinates* | TZ* | comments* | UTC offset | DST | Notes |
|---|---|---|---|---|---|---|
| PT | +3843-00908 | Europe/Lisbon | mainland | +00:00 | - | |
| PT | +3238-01654 | Atlantic/Madeira | Madeira Islands | +00:00 | - | |
| PT | +3744-02540 | Atlantic/Azores | Azores | -01:00 | - |
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