The Software Heritage Acquisition Process (SWHAP) has been developed in collaboration with the University of Pisa, and provides detailed instructions to guide through all the steps needed to successfully curate the legacy source code you care about, and to archive it in Software Heritage.
Dec 16 2019
Actually, the observed dates discrepancy was due to the fact that the SWH snapshot was too old (08/10/2109) and not in sync with the current repository state on GitHub.
So the author date was not yet modified to the real release date of the software.
Also for me, it is not a problem, just two way of displaying the same info;
Maybe "This might be resolved with T2146 ?" - T2149 is this one :)...
Anyway .. No, even if T2146 is resolved, this is unrelated.
Actually the link in this issue https://archive.softwareheritage.org/badge/origin/https://github.com/Unipisa/TAUmus/ was already correctly responding .. as the software was already archived...
Dec 14 2019
This might be resolved with T2149 ?