Package clock offers a more object-oriented interface to the time package from the standard library in the form of "Clocks", allowing greater control over the flow of time. Clocks also enable isolation between individually configurable instances, analogous to [rand]'s alternative interface via instances of [rand.Rand]. Each Clock instance may track its own flow of time, appropriately triggering Timers and Tickers created with them. There are several implementations supplied by subpackages.