My server restarts each nmoring at 6am. i want this plugin to enable pvp on the 8th day of wipe and go back to pve when server wipes the week after.

will this work and how do ido it? i am having problems with multible days 

I believe you cannot set a time frame like that.
What you can do is decide a day of the week for the PVP or PVE to start and another to end. It doesnt count days.
0 Sunday
1 Monday
2 Tuesday
3 Wednesday
4 Thursday
5 Friday
6 Saturday

With these numbers you can do something like:

"1.00:00 PVE PVE ENABLED!",
"6.00:00 PVP CAREFULL, PVP IS NOW ON FOR 24H!"

Since "1" is Monday, this means that every Monday at 00PM the server will be set to PVE.
Since "6" is Saturday, this means that every Saturday at 00PM the server will change to PVP.