operating-hours property definition misses timezones and is different in api.md and ExistingFormatReview in the wiki

[michael-kerscher]

The wiki deviates from the definition found in api.md.
In the wiki operating-hours is defined as as a dict of dicts (day -> {from, to}) and api.md says it is an string type. At the moment the api,first.org is using untyped string type. For better support in tools to show availability it would be good if operating hours are saved in a structured way.

Also including timezone information to these operating hours to be useful.

[aaronkaplan]

I have no problem with having a structured type here as long as it is in addition to the existing freetext form. Reason: the current DBs have it as a freetext form and that will probably not change quickly.