There are several pieces here. The use cases are - Gecko controls the system time on gonk. It needs the ability to set it. - On devices where network-provided time is available, gecko should use it. - The user should have the option of overriding automatically-managed time with their own settings. - Time-sensitive apps (e.g. a clock) need a notification when time has changed. Here's the current plan (1) On OS's where gecko controls the time, privileged APIs to manage time a) Setting to use network provided time/timezone (NITZ or NTP where available) b) Setting for manually-set datetime c) API to enumerate available pre-configured timezones ("US/Los_Angeles", e.g.) d) Setting for manually-set timezone (2) Everywhere: unprivileged notification that time has changed We could support (1) on all platforms by maintaining a "gecko view" of time, but I don't think that's useful.

FxOS has been removed. Closing.