validFrom constant

IRI for schemahttp:validFrom [Expects: http://schema.org/Date, http://schema.org/DateTime]

The date when the item becomes valid.

Can be used on: http://schema.org/Certification, http://schema.org/Demand, http://schema.org/FinancialIncentive, http://schema.org/LocationFeatureSpecification, http://schema.org/MonetaryAmount, http://schema.org/Offer, http://schema.org/OpeningHoursSpecification, http://schema.org/Permit, http://schema.org/PriceSpecification