The skins in GWX 2.0 are designed around mid/late war period. They will not change based on date as SH3 has no function to do this. That is why SH3 Cmdr is used.
I suggest you remove the skin pack from Sh3 Cmdr but keep using the program as it adds too much to ignore.
Like KL has said in this post, a fully compatible date based skin will/may be made however, it's entirely down to the originator of the mod and his realife comitments.