Mountain time, also known as MDT (Mountain Daylight Time) or MST (Mountain StandardTime), refers to the time zones observed in regions where the Rocky Mountains run through, including parts of the United States and Canada. Some synonyms for "mountain time" include "Rocky Mountain time," "mountain standard time," "mountain daylight time," and "UTC-7." These synonyms are used interchangeably with "mountain time" and indicate the same time zone. The use of these synonyms allows for better clarity and consistency in timekeeping, particularly in scheduling and travelling around the affected regions in North America.