how to take away two dates ZOHO?
Time Left = today - Sales End Date

or example jquery:

var date1 = '01/01/1988';

var date2 = '01/01/2017';

date_1  = new Date();

date_1.setTime(Date.parse(date1));

var year1 = date.getFullYear();

date_1.setTime(Date.parse(date2));

var year2 = date.getFullYear();

var age = year2 - year1;

or
How many days have passed since the date???