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.setDate(1);
writeDocument("日:"+oDate.getDate());
oDate.setHours(16); 
writeDocument("时 "+oDate.getHours()); 
oDate.setMinutes(58);
writeDocument("分:"+oDate.getMinutes()); 
oDate.setSeconds(59);
writeDocument("秒: "+oDate.getSeconds()); 
oDate.setMilliseconds(999);
writeDocument("毫秒:"+oDate.getMilliseconds());


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

var oPrintDate = new Date(1994, 12, 7, 17, 05, 59, 999); 
writeDocument("打印1994年12月7日 星期三 15:59:59:999-------------"); 


writeDocument(oPrintDate.getFullYear()+"年"
            +(oPrintDate.getMonth()+ 1)+"月"
            +oPrintDate.getDate()+"日"
            +weeks[oPrintDate.getDay()]+""
            +oPrintDate.getHours()+":"
            +oPrintDate.getMinutes()+":"
            +oPrintDate.getSeconds()+":"
            +oPrintDate.getMilliseconds()); 

oPrintDate.getMonth(4);
writeDocument((oPrintDate.getMonth()+ 1)+"月");