add

adds the number of date units to a date

date	Date	a date object
inc	number	a positive or negative number of units to be added to a date
mode	string	the name of a unit: "day", "week", "month", "quarter", "year", "hour" or "minute"
copy	boolean	defines whether a copy of the date will be created

Date	a date object

Example

var date1 = new Date(2012,11,12);
// the copy parameter is set to false, the date won't be copied
// so the date passed as a 1st parameter will be modified
var date2 = webix.Date.add(date1,2,"day");
 
console.log(date1); // -> Fri Dec 14 2012 00:00:00 GMT+0300 
console.log(date2); // -> Fri Dec 14 2012 00:00:00 GMT+0300 
 
var date1 = new Date(2012,11,12);
// the copy parameter is set to true, the date will be copied
// so the date passed as a 1st parameter won't be modified
var date2 = webix.Date.add(date1,2,"day",true);
 
console.log(date1); // -> Wed Dec 12 2012 00:00:00 GMT+0300 
console.log(date2); // -> Fri Dec 14 2012 00:00:00 GMT+0300

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