UTC−10:00

UTC−10:00 is an identifier for a time offset of −10:00.

It is a time zone for HAST (Hawaii-Aleutian Islands Standard Time).

United States of America

 * Aleutian Islands - Hawaii-Aleutian Islands Standard Time

Pacific

 * American Samoa - Samoa Standard Time
 * Cook Islands - Cook Islands Standard Time
 * Midway Islands - Bering Standard Time

Use of date-shifted time zones vs. nautical time zones
Some countries / islands east of 180° longitude use the date-shifted time zones.

In 1995, The Line Islands (Kiribati) were changed from UTC-10 (currently used by Hawaii) to the UTC+14 in order to be in same date as other countries within Eastern Hemisphere.