The direct answer
Closed days should not be represented as invented opening and closing times. The customer-facing schedule and machine-readable schedule need the same meaning.
What to check
Find how the CMS stores a closed day and inspect the published output. Watch for text such as Closed appearing inside a field intended to contain a clock time.
What to do next
Use the platform's supported closed-day representation. Validate the resulting markup rather than assuming that a human-readable schedule automatically produces valid structured hours.
Further reading
Platform guidance can change. Consult the current official documentation before making platform-specific changes.
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