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fromDisplayHour

function fromDisplayHour(displayHour, dayPeriod): number;

Rebuild a 0–23 hour from a displayed 1–12 hour and a day period.

The midnight/noon wrap is the part that is easy to get wrong: 12 AM is hour 0 and 12 PM is hour 12, so the 12 has to be folded to 0 before the period offset is added rather than after.

ParameterType
displayHournumber
dayPeriodnumber

number