The top day and finish time from the event in ISO-8601 format. Use the same format as startDate. Insert each the day and time so users can find gatherings that healthy into their agenda. For online gatherings, you need to specify the timezone by including the UTC or GMT time https://addons.prestashop.com/fr/seo-referencement-naturel/31857-seo-automatique-google-rich-snippets-json-ld-open-graph.html