Javasrcipt Date format Conversion

An extension to date that converts date to a string of the specified format
The month (m), Day (d), hour (h), Minute (m), second (s), quarter (q) can be used with 1-2 placeholders,
Year (y) can use 1-4 placeholders, milliseconds (S) with only 1 placeholders (1-3 digits)
Example:
(New Date ()). Format ("Yyyy-mm-dd hh:mm:ss. S ") ==> 2006-07-02 08:09:04.423
(New Date ()). Format ("yyyy-m-d h:m:s.s") ==> 2006-7-2 8:9:4.18
Date.prototype.format = function (FMT)
{//author:meizz
var o = {
"m+": This.getmonth () +1,//month
"D+": this.getdate (),//day
"H +": this.gethours (),//hour
"m+": this.getminutes (),//min
"S+": This.getseconds (),//sec
"q+": Math.floor ((This.getmonth () +3)/3),//Quarterly
"S": this.getmilliseconds ()//MS
};
if (/(y+)/.test (FMT))
Fmt=fmt.replace (Regexp.$1, (this.getfullyear () + ""). substr (4-regexp.$1.length));
For (var k in O)
if (New RegExp ("(" + K + ")"). Test (FMT))
FMT = Fmt.replace (regexp.$1, (regexp.$1.length==1)? (O[k]): (("XX" + o[k]). substr (("" + O[k]).));
return FMT;
}
Console.log (New Date (). Format ("YYYY-MM-DD"))
Console.log (New Date (). Format ("Yyyy-mm-dd hh:mm"))
Console.log (New Date (). Format ("Yyyy-mm-dd h:mm"))

/**
* Extension to date, converts date to a string of the specified format
* Months (m), days (d), 12 hours (h), 24 hours (h), minutes (m), seconds (s), Weeks (E), quarter (q) can be used with 1-2 placeholders
* Year (Y) can use 1-4 placeholders, milliseconds (S) only with 1 placeholders (1-3 digits)
* Eg:
* (New Date ()). Pattern ("Yyyy-mm-dd hh:mm:ss. S ") ==> 2006-07-02 08:09:04.423
* (New Date ()). Pattern ("Yyyy-mm-dd E HH:mm:ss") ==> 2009-03-10 II 20:09:04
* (New Date ()). Pattern ("Yyyy-mm-dd EE hh:mm:ss") ==> 2009-03-10 Tuesday 08:09:04
* (New Date ()). Pattern ("Yyyy-mm-dd EEE hh:mm:ss") ==> 2009-03-10 Tuesday 08:09:04
* (New Date ()). Pattern ("yyyy-m-d h:m:s.s") ==> 2006-7-2 8:9:4.18
*/
Date.prototype.pattern=function (FMT) {
var o = {
"m+": This.getmonth () +1,//month
"D+": this.getdate (),//day
"H +": this.gethours ()%12 = = 0? 12:this.gethours ()%12,//hour
"H +": this.gethours (),//hour
"m+": this.getminutes (),//min
"S+": This.getseconds (),//sec
"q+": Math.floor ((This.getmonth () +3)/3),//Quarterly
"S": this.getmilliseconds ()//MS
};
var week = {
"0": "Day",
"1": "One",
"2": "Two",
"3": "Three",
"4": "Four",
"5": "Five",
"6": "Six"
};
if (/(y+)/.test (FMT)) {
Fmt=fmt.replace (Regexp.$1, (this.getfullyear () + ""). substr (4-regexp.$1.length));
}
if (/(e+)/.test (FMT)) {
Fmt=fmt.replace (regexp.$1, (regexp.$1.length>1)? (regexp.$1.length>2?) "Week": "Week"): "") +week[this.getday () + ""]);
}
For (var k in O) {
if (New RegExp ("(" + K + ")"). Test (FMT)) {
FMT = Fmt.replace (regexp.$1, (regexp.$1.length==1)? (O[k]): (("XX" + o[k]). substr (("" + O[k]).));
}
}
return FMT;
}

var date = new Date ();
Console.log (Date.pattern ("Yyyy-mm-dd EEE hh:mm:ss"));

Javasrcipt Date format Conversion