js internationalization time is converted to year, month and day

/**
* js国际化时间转换为年月日，返回年月日
* @param dateStr 日期字符串
*/
function getymd(dateStr) {
    
    
var d = new Date(dateStr);
var resDate = d.getFullYear() + '-' + (d.getMonth() + 1) + '-' + d.getDate();
return resDate;
}