Request for spec: day start & end

[johnjohndoe]

ℹ️ This topic was initially been posted here. In order to give everyone interested in the topic access to comment it was decided to continue the discussion here. This repository is more appropriate for more general topics related to the schedule data specification.

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Context

For each day node in the schedule.xml start and end attributes are defined which contain a date/time value, e.g. 2023-12-27T07:30:00+00:00.
Similar for schedule.json.

Request for specification

1. How exactly are the date/time values chosen?
2. Are the values derived from the event start and end times?

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@saerdnaer , @toto, @manno, @rixx - please be welcome copy/paste your former responses here. That would be great.