i found during a quick search this
no worry, it is written in english for sevenzip application.
is that okay for you?
if link goes down, heres carbon copy
-stl (Set archive timestamp from the most recently modified file) switch
If -stl switch is specified, 7-Zip sets timestamp for archive file as timestamp from the most recently modified file in that archive.
7z u a.7z -stl *.txt
Commands that can be used with this switch
a (Add), d (Delete), rn (Rename), u (Update)