Option to export creation date and modification date

[tfrancart]

Having the ability to export the creation date and modification date as DublinCore properties (dct:created and dct:modified) would be nice.

[logseq-cldwalker]

This would be a good idea when logseq properly supports persistent timestamps. It doesn't currently. There's page-level timestamps but they reset when re-indexing a graph so they aren't persistent. Block timestamps aren't currently supported