Every once in awhile I come across files when troubleshooting that all have the either the same date or are within a week of each other, and this date has remained the same throughout 6 or 7 clean installs of the operating system over the last year (was dealing with hardware issues that masqueraded as software issues I believe). A new clean install most recently, that I did for kicks on a new SSD, installing from the snow leopard disc that shipped with OSX and upgrading back to Maverick has the same files, and I believe that a new install of Maverick from USB a few months ago contained them as well In /etc/ these files appear to be: apache2, csh.cshrc, csh.login, csh.logout, cups, dnsextd.conf, emond.d,find.codes, hosts.equiv, kern_loader.conf, mach_init.d, mach_init_per_login_session.d, mach_init_per_user.d, manpaths.d, notify.conf, paths.d, pf.anchors, postfix, rmtab, security, snmp, and xtab. For curiosities sake, are these files that installed from firmware and the date I see was basically when the Mac was first launched? How does time stamping work, and how does a mac with a brand new hard drive and installation with no files moved over seem to retain this date again and again?