$time service

[jpolo]

I would be nice to have a simple $time { now(): number } service. The now method would be a simple forward to Date.now()
This would allow cleaner and more testable code relying on timeout, calendar, etc. A mockable version would allow to set current time.

[caitp]

I could see this being useful, and could be a good place for a lot of the date input and date filter logic to live.