How to get "updated_at" and "created_at"?


I want to get “updated_at” and “created_at” described in mapidoc/materials at master · materialsproject/mapidoc, but these attributes don’t have any data.

How to get these attributes?
Or, are there alternatives?

“updated_at” is now “last_updated”, and there is no longer a “created_at” field (because the provenance of structures gets updated, and earlier references may be added later).

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