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[JavaScript] Subtract month from date

//Input String yyyymmdd
var date_string = '20200101';

//Create date object
var oDate = new Date(date_string.substr(0, 4), date_string.substr(4, 2), date_string.substr(6, 2));  

oDate.setMonth(oDate.getMonth() - 1); 

var year = oDate.getFullYear().toString()
var month = oDate.getMonth().toString()
var day = oDate.getDay().toString()

//Add leading zero's
if (month.length === 1 ) {
	month = '0' + month;
}
if (day.length === 1 ) {
	day = '0' + day;
}

//Return string: 20191201
var sDate =  year + month + day;

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