clock property
What clock.now() read at the start of every scenario in the run.
Recorded for the reason axes is: a capture is under-specified without
it. Scenarios are pinned to a date by default — see pinnedClockOrigin
— and a pin is only safe while it is stated, because an app with a trial
expiry, a seasonal theme or a "new since" badge sits in a different state
under one and nothing on the screen says why.
Null only in a report written before runs recorded it.
Implementation
final DateTime? clock;