| Light Blue | Western European Time / Greenwich Mean Time (UTC) |
| Blue | Western European Time / Greenwich Mean Time (UTC) |
| Western European Summer Time / British Summer Time / Irish Standard Time (UTC+1) | |
| Red | Central European Time (UTC+1) |
| Central European Summer Time (UTC+2) | |
| Yellow | Eastern European Time / Kaliningrad Time (UTC+2) |
| Ochre | Eastern European Time (UTC+2) |
| Eastern European Summer Time (UTC+3) | |
| Green | Moscow Time / Turkey Time (UTC+3) |
| Turquoise | Armenia Time / Azerbaijan Time / Georgia Time / Samara Time (UTC+4) |
▉▉▉ Dark colours: Summer time observed
In Norway the standard time is the Central European Time (CET). Norway observes Summer Time (sommertid, daylight saving time). The transition dates are the same as for other European countries.
Svalbard and Jan Mayen observe the same time as the mainland.
The westernmost point in Norway proper is on 4°30′E longitude, meaning 42 minutes difference between mean solar time and official time, while the easternmost point in Norway proper is on 31°10′E longitude, meaning 64 minutes difference between mean solar time and official time. The difference between those points is 26°41′ or 1 hour 46 minutes. The 15° E meridian passes Norway in the northern part of the country, from north over Vesterålen and Lofoten islands, then Vestfjorden and finally Salten and Saltfjellet, a total distance of about 320 km. The vast majority of the population in Norway lives to the west of the 15°E longitude.