This feature is not on a current W3C standards track, but it is supported on the Firefox OS platform. Although implementations may change in the future and it is not supported widely across browsers, it is suitable for use in code dedicated to Firefox OS apps.
set method is used to change the system time.
Note: To change the timezone of the system, it's required to use the Settings API.
- The new time to set. It can be either a Date object or a number. If a number is provided, it represents the number of millisconds since midnight UTC January 1, 1970.
Not part of any specification.