hey everyone, i found a great gradle plugin that generates an HTML file for all the open source licenses in the project. however a lot of years seem to be missing and are replaced instead with “20xx” instead of 2019 or 2020. am i supposed to leave that as is? or replace it with 2020?

IANAL, but I've never seen any copyright license guidance advise using a malformed year like that where a year is expected. I have read though (at least in the US) that the license header is just a convenience, the actual copyright actually starts from whenever the content was created, and that creation time can be established other ways than reading the header, eg git history or something I think. But again, not a lawyer.

your basically just giving credit

thanks guys:)