SOURCE

function writeDocument(variable) {
    document.write(variable + "<br/>");
} 
writeDocument("定义时间对象--------------");
var oToday=new Date();

writeDocument("获取年，月，日，时，分，秒，毫秒--------");
writeDocument("年: "+oToday.getFullYear());
writeDocument("月: "+oToday.getMonth());
writeDocument("日: "+oToday.getDate());
writeDocument("时: "+oToday.getHours());
writeDocument("分: "+oToday.getMinutes());
writeDocument("秒: "+oToday.getSeconds());
writeDocument("毫秒: "+oToday.getMilliseconds());

writeDocument("设置年，月，日，时，分，秒，毫秒--------");
var oDate=new Date(2019);

oDate.setFullYear(2020);
writeDocument("年： "+oDate.getFullYear());
oDate.setMonth(5);
writeDocument("月： "+oDate.getMonth()+1);
oDate.setMonth(1);
writeDocument("日： "+oDate.getDate());
oDate.setMonth(16);
writeDocument("时： "+oDate.getHours());
oDate.setMonth(58);
writeDocument("分： "+oDate.getMinutes());
oDate.setMonth(59);
writeDocument("秒： "+oDate.getMilliseconds());

writeDocument("打印2019年6月1日 星期六 15:59:59:999-------------");
var oPrintDate = new Date(2019, 6, 1, 15, 59, 59, 999); 
var weeks = ["星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六"]; 
writeDocument("年: "+oPrintDate.getFullYear());
writeDocument("月: "+oPrintDate.getMonth());
writeDocument("日: "+oPrintDate.getDate());
writeDocument("今天是："+weeks[oPrintDate.getDate()]);
writeDocument("时: "+oPrintDate.getHours());
writeDocument("分: "+oPrintDate.getMinutes());
writeDocument("秒: "+oPrintDate.getSeconds());
writeDocument("毫秒: "+oPrintDate.getMilliseconds());