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sdDatePublished

This term is proposed for full integration into Schema.org, pending implementation feedback and adoption from applications and websites.

Thing > Property > sdDatePublished

Indicates the date on which the current structured data was generated / published. Typically used alongside sdPublisher
Values expected to be one of these types
Date
Used on these types
CreativeWork

Source

https://github.com/schemaorg/schemaorg/issues/1886