Schema.org Questions

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How to add time to schema event type

My startdate looks like this 03-03-2020 but i need to add time as well. i have checked some example schema from other sources and have come across
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Representing search results in JSON-LD

I am uncertain how to represent search results in json-ld. e.g. for a page containing hotel search results, should each hotel be included in an array of
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Using Demand in Schema.org

I'm working on a website where companies create posts to describe services they need. for me, this action is basically making a demand, in the

Adding schema.org to site

I want to add schema.org to my site, i've read some guides for that and i understood the way i should do that. but should i add these tags for example for images and
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