<HTML>
<body>
</body>
<Script>
function getDateAgo(date, num){
let dateSet = new Date(date);
dateSet.setDate(dateSet.getDate() - num);
return dateSet;
}
let date = new Date(2015, 0, 2);// 2 jan
alert( getDateAgo(date, 1) ); // 1, (1 Jan 2015)
alert( getDateAgo(date, 2) ); // 31, (31 Dec 2014)
alert( getDateAgo(date, 365) ); // 2, (2 Jan 2014)
</Script>
</HTML>
<body>
</body>
<Script>
function getDateAgo(date, num){
let dateSet = new Date(date);
dateSet.setDate(dateSet.getDate() - num);
return dateSet;
}
let date = new Date(2015, 0, 2);// 2 jan
alert( getDateAgo(date, 1) ); // 1, (1 Jan 2015)
alert( getDateAgo(date, 2) ); // 31, (31 Dec 2014)
alert( getDateAgo(date, 365) ); // 2, (2 Jan 2014)
</Script>
</HTML>
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