how to print date like 10-may-2018 in javascript

date.toString('YYYY-MM-dd'); 'Tue Feb 10 2015 15:42:50'

var date = new Date('4-1-2015');

date.getDay();// returns 3    

date.getYear();// returns 115, no of years after 1900

date.getFullYear();// returns 2015 

date.getMonth();// returns 3, starting 0 with jan 

date.getUTCDate();// returns 31