This is the 1st hint something is not right from the OP's post.
17:42:15 [WARNING] Could not get information about this CraftBukkit version; per
haps you are running a custom one?: FileNotFoundException
Seems to me the error is in how it determines CraftBukket versions and yes the date is not formatted correctly.......but how does it find this out? Must be by going to bucket's servers and checking every time you start the local server. So... to me it is still a bucket/forge issue and not a local one.
Maybe this is the best hint. Registering world world, dimension 0, of providertype net.minecraft.server.WorldProviderNormal@61beb1cd(0) with Minecraft Forge