js日期转换

Date.prototype.format = function(f){
    var o ={
        "M+" : this.getMonth()+1, //month
        "d+" : this.getDate(),    //day
        "h+" : this.getHours(),   //hour
        "m+" : this.getMinutes(), //minute
        "s+" : this.getSeconds(), //second
        "q+" : Math.floor((this.getMonth()+3)/3),  //quarter
        "S" : this.getMilliseconds() //millisecond
    };
    if(/(y+)/.test(f))f=f.replace(RegExp.$1,(this.getFullYear()+"").substr(4 - RegExp.$1.length));
    for(var k in o)
        if(new RegExp("("+ k +")").test(f))f = f.replace(RegExp.$1,RegExp.$1.length==1 ? o[k] : ("00"+ o[k]).substr((""+ o[k]).length));return f
};

  formatter : function(value, rowData, rowIndex) {
	var d= new Date();
 	d.setTime(value);
    	var s=d.format('yyyy-MM-dd');
  	return s;
  }