[JavaScript] Subtract month from date in format yyyyMMdd

//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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