Support schema.org Date and Time types

[Gummibeer]

Discussed in #202

^{Originally posted by indyjonesnl January 10, 2024}

$lodgingBusiness = Schema::lodgingBusiness()
  ->openingHours(
    Schema::openingHoursSpecification()
      ->dayOfWeek([Schema::dayOfWeek()::Monday])
      ->opens(new DateTime('09:00:00'))
      ->closes(new DateTime('17:00:00'))
  )
  ->checkinTime(new DateTime('14:00:00'))
  ->checkoutTime(new DateTime('11:00:00'))

This results in the current date + time being included in the output "opens":"2024-01-10T09:00:00+00:00","closes":"2024-01-10T17:00:00+00:00" and ..."checkinTime":"2024-01-10T14:00:00+00:00","checkoutTime":"2024-01-10T11:00:00+00:00"...

While the Schema should contain only the time, formatted as 14:30:00+08:00.

Can someone point me in the right direction?