About the form of the date obtained in JavaScript

1 getting the date format and its conversion
(1) var date = new Date ()

　　　　Console.log (date); Wed 10:07:16 gmt+0800 (China Standard Time)
(2) var date = Date.now ()

　　　　Console.log (date); 1493777310036
(3) var date = +new date (); IE9 the following is not supported

　　　　Console.log (date); 1493777310036

In (1), if the result of date is Wed 10:07:16 gmt+0800 (China Standard Time),
Console.log (Date.tostring ()); Wed 10:10:56 gmt+0800 (China Standard Time)
Console.log (Date.todatestring ());// Wed May 03 2017
Console.log (Date.tolocaledatestring ()); 2017/5/3*/

2 Note:
var date1 = new Date (2017,04,01)//Represents May.

　　var date1 = new Date (' 2017-5-1 ')//equals above
Console.log (Date1)
var date2 = new Date (1493777310036)
Console.log (date2)//wed may 10:08:30 gmt+0800 (China Standard Time)
var date3 = new Date ()
Console.log (date3.valueof ())//1493778043334

This millisecond number represents the number of milliseconds since 1970-01-01.
Returns the number of milliseconds corresponding to the time object, so you can use > < to determine the size of the two period

3 Gets the specified part of the date:
GetTime () returns the same number of milliseconds as the valueof () result
Getmilliseconds ()//MS
Getseconds () returns 0-59
Getminutes () returns 0-59
GetHours () returns 0-23
GetDay () returns day of the week 0 Sunday 6 weeks 6
GetDate () returns the day ordinal of the current month
GetMonth () returns the month, starting from 0
getFullYear () returns a 4-bit year, such as 2016

4 Package for 2017-05-01 12:12:12 format

function GetDateTime (DT) {

//Get all the elements we need first ~
             var year=dt.getfullyear ();
            var month=dt.getMonth () +1;
            var day=dt.getDate ();
            var h=dt.getHours ();
            var m=dt.getMinutes ();
            var s=dt.getSeconds ();

Here should think about, if is the number what to do? Then use ternary expressions to deal with
Month=month<10? " 0 "+month:month;
Day=day<10? " 0 "+day:day;
H=h<10? " 0 "+H:H;
M=m<10? " 0 "+M:M;
S=s<10? " 0 "+S:S;

The following can be returned
Return year+ "Year" +month+ "month" +day+ "Day" +h+ "when" +m+ "sub" +s+ "Seconds";
}

Put this method into our project's JS file, when I need to call directly on it.
GetDateTime (New Date ());

About the date that is obtained in JavaScript