So right now you can add --name to every item that you pin in cluster. The upcoming feature allows you to add any custom “key:value” to it. The information is stored by Cluster.
And it is possible to generate a Timestamp directly in IPFS in order to be sure that a file has been added to IPFS in that date and at that time?
It is not possible at the moment, but timestamps can be faked so adding a timestamp on a custom tag is equivalent to IPFS doing it for you. What I mean is that, regardless of how you do it, you cannot “be sure that a file has been added in a date/time”