Functions for working with time during a spec.
Set up the scenario at a particular timezone offset.
Provide the timezone offste in minutes.
A step that simulates waiting for some number of milliseconds to pass.
Any subscriptions that depend on the passage of time will be triggered as expected.
A step that simulates waiting for the next animation frame.
Any subscriptions that depend on animation frame updates will be triggered as expected.
Set up the scenario at a particular time.
Provide the number of milliseconds since the UNIX epoch.