解析json数据

var json = {
"msgTime":{"date":20,"day":4,"hours":14,"minutes":52,"month":7,"seconds":14,"time":1440053534000,"timezoneOffset":-480,"year":115}
}
var str = (json.msgTime.year+1900)+"-"+(json.msgTime.month+1)+"-"+json.msgTime.date+" "+json.msgTime.hours+":"+json.msgTime.minutes+":"+json.msgTime.seconds;
alert(str);