By the way, if you have difficulty fully syncing your Dash Core wallet you can also download latest Dash bootstrap
from here :  
https://github.com/UdjinM6/dash-bootstrap(7.7G download of whole Dash mainnet blockchain).
Also deleting the peers.dat file may help with getting some new connections, that may help with your current sync problem. 
And make sure you are on latest Dash Core wallet version.
I did all of this above but it has not helped. I still can not sync the wallet and it is still stuck at 18 weeks behind.
I followed the instructions given in github for downloading and installing the boot strap.
Please, can someone offer some help that will work?  Thank you.