javascriptのDate対象

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<br>    //1.    1<br>//    var date_obj=new Date();<br>//    alert(date_obj)//Wed Jan 29 2020 16:44:15 GMT+0800 (      )<br>//    alert(date_obj.toLocaleString())//2020/1/29   4:45:58<br>    //    ----   1<br>//    var date_obj1=new Date('2020/12/25 17:30');<br>//    alert(date_obj1.toLocaleString())//2020/12/25   5:30:00<br>    //    2<br>//      var date_obj2=new Date('2020 12 25 17:30');<br>//      alert(date_obj2.toLocaleString())//2020/12/25   5:30:00<br>    //2.   <br>//     var date_obj3=new Date(5000);<br>//     alert(date_obj3.toLocaleString());//1970/1/1   8:00:05<br>//     alert(date_obj3.toUTCString());//Thu, 01 Jan 1970 00:00:05 GMT<br>//    3.date  <br>//    var date_obj4=new Date();<br>//    alert(date_obj4.getFullYear());//2020<br>//    alert(date_obj4.getMonth());//0<br>//    alert(date_obj4.getDate());//29<br>//    alert(date_obj4.getDay());//3<br>//    alert(date_obj4.getHours());//17<br>//    alert(date_obj4.getMinutes());//2<br>//    alert(date_obj4.getSeconds());//28<br>//    alert(date_obj4.getMilliseconds());//207<br>    function getTime() {<br>     var date_obj= new Date();<br>     var year=date_obj.getFullYear();<br>    var month=date_obj.getMonth()+1;<br>    var day=date_obj.getDate();<br>    var hour=date_obj.getHours();<br>    var minute=date_obj.getMinutes();<br>    var seconds=date_obj.getSeconds();<br>    var week=date_obj.getDay();<br><br><br>    return year+" "+month+" "+f(day)+" "+" "+hour+": "+minute+" :"+seconds+" "+num_week(week)<br>}<br>    //Date  ：<br>    alert(getTime());//2020 1 29  17: 34 :19    <br>    function f(num) {<br>        if (num<10){<br>             return "0"+num;<br>        }<br>        return num;<br>    }<br>    function num_week(n) {<br>        week=["   ","   ","   ","   ","   ","   ","   "];<br>        return week[n]<br>    }<br><br><br><br><br>