valid From

the date and time when the offer becomes active, meaning when you can start booking, purchasing, or accepting it. Example: For the boat lease, this might be when the offer is first posted (e.g., June 1, 2010).

Values expected to be one of these types: Date
DateTime
Used on these types: Demand MonetaryAmount LocationFeatureSpecification PriceSpecification OpeningHoursSpecification Permit Offer Listing
Equivalent Properties: schema:validFrom
Sources: w3.org.../wiki/WebSchemas/SchemaD... →