The disk image here contains a 7th Edition UNIX system which has had some
Y2K bug fixes applied by Alexey Chupahin <achupahi@uic.rnd.runnet.ru>. I
don't have exact details on what he fixed, but here are some comments:

You just get file containing Unix7  Y2k system. 2 new utilities come with it:
"date2" Y2k command  and "sl" string command editor with stack of previously
entered command.

format of command:

date2  year month day [hour minutes [sec]]

#date2 2000 4 8 11 45

for example.

Unfortunatly, I find a bug in sl command too late, sorry (it is not fatal,
but unefficient). I've fixed it in BSD Y2k version image that I patched yet.
You may copy binary sl file from BSD to Unix7 and it will work or recompile
source using Unix7 cc compiler.