Source: Schema.org v30.1 vocabulary. Official dateModified property definition.
What does dateModified mean?
The date on which the CreativeWork was most recently modified or when the item's entry was modified within a DataFeed.
Used on types (domainIncludes)
Expected value types (rangeIncludes)
Schema.org domainIncludes and rangeIncludes are descriptive guidance, not strict validation prohibitions. Check the official reference for updates.
Related reference
Browse all Schema.org types and properties · Google feature support status