Time ZonesWhat UTC−1 means
A clock set to UTC−1 shows UTC minus 1 hour. When it is 12:00 noon UTC, it is 11:00 am here. Compared with India (UTC+5:30) it is 6 hours 30 minutes behind.
Converting to and from UTC−1
To turn UTC into this time, subtract 1 hour. To go back to UTC, add the same amount. Three examples: 6:00 am UTC is 5:00 am here; 3:00 pm UTC is 2:00 pm here; 9:00 am here is 10:00 am UTC. The calendar date changes whenever the sum passes midnight.
Where UTC−1 sits on the map
The Earth turns 15 degrees of longitude every hour. The line where the sun-time matches UTC−1 exactly is 15° west. The places that use it are spread much wider than that one line. Of the main cities listed below, Nuuk (51.7° west) is the farthest west and Praia (23.5° west) the farthest east. By the sun they are about 1 hour 53 minutes apart, yet their clocks agree.
Who is on UTC−1, and when
1 zone area in 1 country keeps UTC−1 through the whole year. The towns of 15,000 or more there hold about 253,000 people (GeoNames figures). 2 more zone areas are on it for only part of the year: for 1 of them it is the standard (winter) time and for 1 it is the moved (summer) time. That is why the number of people on UTC−1 rises and falls with the seasons.
Noon at UTC−1 elsewhere
When a clock on UTC−1 shows 12:00 noon, it is 6:30 pm in India; 1:00 pm in London in January and 2:00 pm in July; 8:00 am in New York in January and 9:00 am in July; 10:00 pm in Tokyo. For any other place or date, use the converter.
Largest cities on this time
Praia, Mindelo, Espargos, Ponta Delgada, Nuuk.
All year
These places keep UTC−1 through the whole year.
Part of the year
These places are on UTC−1 for part of the year and move their clocks for the rest. Open one for its dates.
Neighbouring offsets: UTC−2:30, UTC−2, UTC, UTC+1. All UTC offsets.