时间戳转为日期格式

//2019-10-09
function fmtDate(obj){
　　var date = new Date(obj);
　　var y = 1900+date.getYear();
　　var m = "0"+(date.getMonth()+1);
　　var d = "0"+date.getDate();
　　return y+"-"+m.substring(m.length-2,m.length)+"-"+d.substring(d.length-2,d.length);
}

//2019-10-09 15:26:34
function add0(m){return m<10?'0'+m:m }  
function timestampToTime(needTime){
    var time = new Date(needTime);  
    var y = time.getFullYear();  
    var m = time.getMonth()+1;  
    var d = time.getDate();  
    var h = time.getHours();  
    var mm = time.getMinutes();  
    var s = time.getSeconds();  
    return y+'-'+add0(m)+'-'+add0(d)+' '+add0(h)+':'+add0(mm)+':'+add0(s);  
}