Time ZonesWhat UTC−10 means
A clock set to UTC−10 shows UTC minus 10 hours. When it is 12:00 noon UTC, it is 2:00 am here. Compared with India (UTC+5:30) it is 15 hours 30 minutes behind.
Converting to and from UTC−10
To turn UTC into this time, subtract 10 hours. To go back to UTC, add the same amount. Three examples: 6:00 am UTC is 8:00 pm here on the previous day; 3:00 pm UTC is 5:00 am here; 9:00 am here is 7:00 pm UTC. The calendar date changes whenever the sum passes midnight.
Where UTC−10 sits on the map
The Earth turns 15 degrees of longitude every hour. The line where the sun-time matches UTC−10 exactly is 150° west. The places that use it are spread much wider than that one line. Of the main cities listed below, Avarua (159.8° west) is the farthest west and Faaa (149.6° west) the farthest east. By the sun they are about 41 minutes apart, yet their clocks agree.
Who is on UTC−10, and when
3 zone areas in 3 countries and territories keep UTC−10 through the whole year. The towns of 15,000 or more there hold about 1.4 million people (GeoNames figures). Nobody moves on to or off this offset during the year, so the list below is the same in every season.
Noon at UTC−10 elsewhere
When a clock on UTC−10 shows 12:00 noon, it is 3:30 am the next day in India; 10:00 pm in London in January and 11:00 pm in July; 5:00 pm in New York in January and 6:00 pm in July; 7:00 am the next day in Tokyo. For any other place or date, use the converter.
Largest cities on this time
Honolulu, East Honolulu, Pearl City, Faaa, Papeete, Punaauia, Avarua.
All year
These places keep UTC−10 through the whole year.
Neighbouring offsets: UTC−11, UTC−9:30, UTC−9. All UTC offsets.