NTP server sync

Hi Sailors, I just wanna know if exists some possibility to sync my SFOS X with defined NTP server in the internet. And if not, is someone skilled to make an app for this? My idea is simple app, where you define NTP server and: a) option 1 is to use app manually whenever you need to have precise time (just open an app and tap on SYNC button) - simple solution - I am not keen on automatic sync b) option 2 is to have sync setting in app - time sync every x hours, or every day, or once a week Thanks for the help :)