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

oDate.setFullYear(2020);
writeDocument("年："+oDate.getFullYear());

oDate.setMonth(5);
writeDocument("月："+oDate.getMonth());

oDate.setDate(20);
writeDocument("日："+oDate.getDate());

oDate.setHours(18);
writeDocument("时："+oDate.getHours());

oDate.setMinutes(50);
writeDocument("时："+oDate.getMinutes());

oDate.setFullYear(2020);
writeDocument("分："+oDate.getFullYear());

oDate.setMilliseconds(999);
writeDocument("毫秒"+oDate.getMilliseconds());

var week=["星期一","星期二","星期三","星期四","星期五","星期六","星期日"];
writeDocument("今天是"+week[oToday.getDay()]);

var oPrintDate = new Date(2019, 5, 1, 15, 59, 59, 999);
writeDocument("");