Employment Law Questions? Ask an Employment Lawyer.
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Here is the information for CA:
“Workday” is defined in the Industrial Welfare Commission Orders and Labor Code § 500 for the purpose of determining when daily overtime is due. A workday is a consecutive 24-hour period beginning at the same time each calendar day, but it may begin at any time of day. The beginning of an employee’s workday need not coincide with the beginning of that employee’s shift, and an employer may establish different workdays for different shifts. However, once a workday is established it may be changed only if the change is intended to be permanent and the change is not designed to evade overtime obligations. Daily overtime is due based on the hours worked in any given workday; and the averaging of hours over two or more workdays is not allowed.