8 string references to 'CommonDataConverter::dateIso8601Value'

d7_rdf_mapping.yml in core/modules/rdf/migrations/d7_rdf_mapping.yml
core/modules/rdf/migrations/d7_rdf_mapping.yml
rdf.mapping.comment.comment.yml in core/profiles/standard/config/install/rdf.mapping.comment.comment.yml
core/profiles/standard/config/install/rdf.mapping.comment.comment.yml
rdf.mapping.node.article.yml in core/profiles/standard/config/install/rdf.mapping.node.article.yml
core/profiles/standard/config/install/rdf.mapping.node.article.yml
rdf.mapping.node.article.yml in core/profiles/demo_umami/config/install/rdf.mapping.node.article.yml
core/profiles/demo_umami/config/install/rdf.mapping.node.article.yml
rdf.mapping.node.forum.yml in core/modules/forum/config/optional/rdf.mapping.node.forum.yml
core/modules/forum/config/optional/rdf.mapping.node.forum.yml
rdf.mapping.node.page.yml in core/profiles/standard/config/install/rdf.mapping.node.page.yml
core/profiles/standard/config/install/rdf.mapping.node.page.yml
rdf.mapping.node.page.yml in core/profiles/demo_umami/config/install/rdf.mapping.node.page.yml
core/profiles/demo_umami/config/install/rdf.mapping.node.page.yml
rdf.mapping.node.page.yml in core/modules/node/tests/modules/node_display_configurable_test/config/install/rdf.mapping.node.page.yml
core/modules/node/tests/modules/node_display_configurable_test/config/install/rdf.mapping.node.page.yml

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