Structured data is a standardized format for providing information about a page and classifying the page content; for example, on a recipe page, what are the ingredients, the cooking time and temperature, the calories, and so on.

Structured data can include names, addresses, dates—fields that are recognizable and searchable by computers. Dates and Times: Dates and times follow a specific format, making it easy for machines to read and analyze them. For instance, a date can be structured as YYYY-MM-DD, while a time can be structured as HH:MM:SS.

Test your structured data Google recommends that you start with the Rich Results Test to see what Google rich results can be generated for your page. For generic schema validation, use the Schema Markup Validator to test all types of schema.org markup, without Google-specific validation.