Module clock 

Time, injected rather than read.

Study timestamps come from an injected Clock. Two reasons, both load-bearing:

• wasm. wasm32-unknown-unknown has no wall clock; SystemTime::now() panics there. Keeping time behind a trait is what lets cargo check -p atune_core --target wasm32-unknown-unknown --no-default-features stay green.
• Determinism. Tests drive ManualClock and get reproducible heartbeat, deadline and fail-over behaviour instead of sleeping.

SystemClock is the production implementation and lives behind the system feature. ManualClock is always available.

Structs

ManualClock

A clock that only moves when a test moves it.

SystemClock

The operating system’s wall clock, in milliseconds since the Unix epoch.

Traits

Clock

A source of milliseconds.