js take several seconds of the current time stamp

the parseInt ( new new a Date () the getTime () / 1000.) ;, 
or Date.parse ( new new a Date ()) / 1000; 


. 1 , converting the current date stamp.
    var now = new new a Date (); 
    the console.log (now.getTime ())   // converts the current date stamp, getTime () method returns the number of milliseconds between from January 1, 1970. May also be used + now, the effect is the same now.getTime () 

// (2), to convert the specified date stamp. 
    var T = "2017-12-08 20 is:. 5: 30";   // month, day, hour, minute, second two digits may not be less than if the band of 0. The 
    var T = new new a Date (T);   // the specified date into a standard date format. Fri Dec 08 2017 20:05:30 GMT + 0800 ( China Standard Time) 
    console.log (T.getTime ())   // converts standard date back to a timestamp. 


2 , the timestamp into a date.
var t = 787 986 456 465;   // When the parameter is a number, then this parameter is the time stamp, is considered milliseconds, creation date and time specified object is a millisecond from 1 January 1970. 
the console.log ( new new a Date (T)) // Wed On Dec 1994 13:07:36 GMT + 21 is 0800 (China Standard Time) 

var T2 = "2017-5-8 12:50:30" ; 
the console.log ( new new DATE (T2)) // Mon On May 08 12:50:30 GMT 2017 + 0800 (China standard time) 

var T3 = "2017-10-1" ; 
the console.log ( new new DATE (T3)) // the Sun On Oct 01 2017 00:00:00 GMT + 0800 (China standard time) every minute is not set, the default converted 00:00:00


 
3 the date stamp is converted into the specified format of the encapsulation method: 

// formatted date, moon , day, hour, minute, second two digits to ensure that 
function = formatNumber (n-) {
    n- n.toString ()
     return ? n-[. 1] n-: '0' + n-; 
} 
// parameter number milliseconds timestamp, format need be converted into date format 
function FormatTime (number, format) { 
    the let Time = new new DATE (Number) 
    the let newArr = [] 
    the let formatArr = [ 'the Y', 'm', 'D', 'H', 'm', 'S' ] 
    newArr.push (time.getFullYear ()) 
    newArr.push (formatNumber (time.getMonth () +. 1 )) 
    newArr.push (formatNumber (time.getDate ())) 

    newArr.push (formatNumber (time.getHours ())) 
    newArr.push (formatNumber (time.getMinutes ()) )
    newArr.push (formatNumber (time.getSeconds ())) 

    for (the let I in newArr) { 
        the format = format.replace (formatArr [I], newArr [I]) 
    } 
    return the format; 
} 



if necessary to call the method described above, using formatTime ( 1,545,903,266,795, 'on the Y D m dated May h: m: s'), or formatTime (1545903266795, 'YMD h: m: s') to

Original: https://www.cnblogs.com/jf-67/p/8007008.html