JTSync is a simple utility that provides the ability to synchronize your computer clock over a network with world-wide NTP servers. When the Internet connection is not available, JTSync allows you to make time adjustments based on decoded QSOs within the WSJT-X application.This may help if you are f.e. on a /p or DX Expedition.
Software is freeware and can be found here as well more information: http://www.dxshell.com/jtsync.html
(pictures are courtesy of http://www.dxshell.com)