This is BLFS-BOOK version 12.2 dated September 1st, 2024. This is the 12.2 branch of the BLFS book, currently targeting the LFS 12.2 book. For development versions, if this version is older than a month, it's likely that your mirror hasn't been synchronized recently and a newer version is probably available for download or viewing. Check one of the mirror sites at https://www.linuxfromscratch.org/mirrors.html for an updated version.