The day of injury is treated separately, deliberately
Almost every injury costs some part of the day it happened. Counting that day would make nearly everything a days-away case, so the rule starts the clock the following day. A partial day worked on the day of the injury is not, by itself, anything.
The day after is where it becomes recordable
Restricted work activity occurs when the employer prevents the employee from working the full workday they would otherwise have been scheduled to work. Sent home early on Tuesday after a Monday injury is restricted work. The same early finish on Monday is not.
Long shifts make this more common than it looks
On a sixteen-hour shift an employee can work a substantial day and still not work the full scheduled one. The test is the shift they were scheduled for, not a notional eight hours.
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