Day and time guidelines When implementing the startDate, endDate, and previousStartDate Qualities, abide by these day and time guidelines. How you can specify timezones I wouldn’t give A lot pounds to their advice. They are saying that "Structured knowledge markup is most easily represented in JSON-LD structure", but I believe https://wavesocialmedia.com/story4455892/new-step-by-step-map-for-json-schema-primary-key