JS get the current date time and format code _javascript tips

This article for everyone to share JS get the current date time and format operation, the specific contents are as follows

var mydate = new Date ();
Mydate.getyear ();    Gets the current year (2-bit)
mydate.getfullyear ();  Get full year (4-bit, 1970-????)
Mydate.getmonth ();    Get the current month (0-11, 0 for January)
mydate.getdate ();    Gets the current day (1-31)
mydate.getday ();     Get Current week x (0-6, 0 representative Sunday)
Mydate.gettime ();    Gets the current time (the number of milliseconds since 1970.1.1)
mydate.gethours ();    Gets the current number of hours (0-23)
mydate.getminutes ();   Gets the current number of minutes (0-59)
mydate.getseconds ();   Gets the current number of seconds (0-59)
mydate.getmilliseconds ();  Gets the current number of milliseconds (0-999)
mydate.tolocaledatestring ();   Gets the current date
var mytime=mydate.tolocaletimestring ();   Gets the current time
mydate.tolocalestring ();    Get Date and time

Date Time Script Library method list
Date.prototype.isLeapYear Judge Leap Year
Date.prototype.Format Date format
DATE.PROTOTYPE.DATEADD Date Calculation
Date.prototype.DateDiff Comparison Date Difference
Date.prototype.toString Date-turn string
Date.prototype.toArray date split into arrays
Date.prototype.DatePart some information about the date
Date.prototype.MaxDayOfDate the maximum number of days of the month from which the date is taken
Date.prototype.WeekNumOfYear the first weeks of the year in which the date is judged
Stringtodate String Turn Date type
Isvaliddate Validation Date Validity
Checkdatetime Full Date Time check
Daysbetween Date Days Bad

JS Code:

---------------------------------------------------//Judgment Leap Year//-------------------------------------------------- -Date.prototype.isLeapYear = function () {return (0==this.getyear ()%4&& (This.getyear ()%100!=0) | |  
(This.getyear ()%400==0)); 
}//---------------------------------------------------//Date format//Format YYYY/YYYY/YY/YY = year//mm/m month//w/w week DD/DD/D/D Date//hh/hh/h/h time//mm/m minutes//ss/ss/s/s seconds//---------------------------------------------------date. Prototype.  
  Format = function (formatstr) {var str = FORMATSTR; 
 
  var Week = [' Day ', ' one ', ' two ', ' three ', ' four ', ' five ', ' six ']; Str=str.replace (/yyyy|  
  Yyyy/,this.getfullyear ()); Str=str.replace (/yy| yy/, (this.getyear ()%) >9?  
 
  (This.getyear ()%). ToString (): ' 0 ' + (this.getyear ()% 100));  
  Str=str.replace (/mm/,this.getmonth () >9?this.getmonth (). toString (): ' 0 ' + this.getmonth ());  
 
  Str=str.replace (/m/g,this.getmonth ()); Str=str.replace (/w|  
 
  W/g,week[this.getday ()]); Str=str.rEplace (/dd|  
  Dd/,this.getdate () >9?this.getdate (). toString (): ' 0 ' + this.getdate ()); Str=str.replace (/d|  
 
  D/g,this.getdate ()); Str=str.replace (/hh|  
  Hh/,this.gethours () >9?this.gethours (). toString (): ' 0 ' + this.gethours ()); Str=str.replace (/h|  
  H/g,this.gethours ());  
  Str=str.replace (/mm/,this.getminutes () >9?this.getminutes (). toString (): ' 0 ' + this.getminutes ());  
 
  Str=str.replace (/m/g,this.getminutes ()); Str=str.replace (/ss|  
  Ss/,this.getseconds () >9?this.getseconds (). toString (): ' 0 ' + this.getseconds ()); Str=str.replace (/s|  
 
  S/g,this.getseconds ());  
return str; }  
 
//+--------------------------------------------------- 
//| A two-time number of days difference date format is YYYY-MM-DD//+---------------------------------------------------function Daysbetween (Dateone, 
  Datetwo) {var onemonth = dateone.substring (5,dateone.lastindexof ('-')); 
  var oneday = dateone.substring (Dateone.length,dateone.lastindexof ('-') +1); 
 
var oneyear = dateone.substring (0,dateone.indexof ('-'));  var twomonth = datetwo.substring (5,datetwo.lastindexof ('-')); 
  var twoday = datetwo.substring (Datetwo.length,datetwo.lastindexof ('-') +1); 
 
  var twoyear = datetwo.substring (0,datetwo.indexof ('-'));  
  var cha= (Date.parse (onemonth+ '/' +oneday+ '/' +oneyear ')-date.parse (twomonth+ '/' +twoday+ '/' +twoyear))/86400000); 
Return Math.Abs (CHA); } 
 
 
//+--------------------------------------------------- 
//|  
  Date Calculation//+---------------------------------------------------Date.prototype.DateAdd = function (strinterval, number) { 
  var dttmp = this; 
    Switch (strinterval) {case ' s ': return new Date (Date.parse (dttmp) + (1000 * number)); 
    Case ' n ': return new Date (Date.parse (dttmp) + (60000 * number)); 
    Case ' H ': return new Date (Date.parse (dttmp) + (3600000 * number)); 
    Case ' d ': return new Date (Date.parse (dttmp) + (86400000 * number)); 
    Case ' W ': Return new Date (Date.parse (dttmp) + ((86400000 * 7) * number)); Case ' Q ': return new Date (Dttmp.getfullyear (), (d)Ttmp.getmonth ()) + number*3, Dttmp.getdate (), dttmp.gethours (), Dttmp.getminutes (), dttmp.getseconds ()); Case ' m ': return new Date (Dttmp.getfullyear (), (Dttmp.getmonth ()) + number, dttmp.getdate (), dttmp.gethours (), 
    Dttmp.getminutes (), dttmp.getseconds ()); Case ' Y ': Return new Date ((dttmp.getfullyear () + number), Dttmp.getmonth (), Dttmp.getdate (), dttmp.gethours (), 
  Dttmp.getminutes (), dttmp.getseconds ()); } 
} 
 
//+--------------------------------------------------- 
//| Compare Date Difference dtend format is a date type or a valid date format string//+---------------------------------------------------Date.prototype.DateDiff = 
  function (Strinterval, dtend) {var dtstart = this; 
  if (typeof dtend = = ' string ')//if the string is converted to date type {dtend = Stringtodate (dtend); 
    Switch (strinterval) {case ' s ': Return parseint (Dtend-dtstart)/1000); 
    Case ' n ': Return parseint ((Dtend-dtstart)/60000); 
    Case ' H ': Return parseint ((dtend-dtstart)/3600000); Case ' d ': return parseint (DTEND-DTSTART)/86400000); 
    Case ' W ': Return parseint (Dtend-dtstart)/(86400000 * 7)); 
    Case ' m ': Return (Dtend.getmonth () +1) + ((Dtend.getfullyear ()-dtstart.getfullyear ()) *12)-(Dtstart.getmonth () +1); 
  Case ' Y ': return dtend.getfullyear ()-dtstart.getfullyear (); } 
} 
 
//+--------------------------------------------------- 
//| The date output string that overloads the system's ToString method//+---------------------------------------------------Date.prototype.toString = function 
(Showweek) 
  {var mydate= this; 
  var str = mydate.tolocaledatestring (); 
    if (Showweek) {var Week = [' Day ', ' one ', ' two ', ' three ', ' four ', ' five ', ' six ']; 
  STR + + ' Week ' + week[mydate.getday ()]; 
return str; } 
 
//+--------------------------------------------------- 
//| Date legality Verification//| Format is: YYYY-MM-DD or yyyy/mm/dd//+---------------------------------------------------function isvaliddate (datestr) {V Ar sdate=datestr.replace (/(^\s+|\s+$)/g, ");  
  Go to both sides of the space;  
  if (sdate== ') return true; If the format satisfies the yyyy-(/) mm-(/) DD or yyyy-(/) m (/) DD oryyyy-(/) m (/) d or yyyy-(/) mm-(/) d is replaced with the '//database, the legal date can be: Yyyy-mm/dd (2003-3/21), the database is automatically converted to the YYYY-MM-DD format var s = Sdate.repl  
  Ace (/[\d]{4,4}[\-/]{1}[\d]{1,2}[\-/]{1}[\d]{1,2}/g, ");  
    if (s== ')//description format satisfies YYYY-MM-DD or YYYY-M-DD or yyyy-m-d or yyyy-mm-d {var t=new Date (Sdate.replace, '/'));  
    var ar = sdate.split (/[-/:]/); if (Ar[0]!= t.getyear () | | ar[1]!= t.getmonth () +1 | | ar[2]!= t.getdate ()) {//alert (' Wrong date format! The format is: Yyyy-mm-dd or YYYY/MM/DD. Notice leap year.  
      ');  
    return false; } else {//alert (' Wrong date format! The format is: Yyyy-mm-dd or YYYY/MM/DD. Notice leap year.  
    ');  
  return false;  
return true; }  
 
//+--------------------------------------------------- 
//| Date Time Check//| Format is: yyyy-mm-dd HH:MM:SS//+---------------------------------------------------function checkdatetime (str) {var re  
  g =/^ (\d+)-(\d{1,2})-(\d{1,2}) (\d{1,2}):(\d{1,2}):(\d{1,2}) $/;  
  var r = Str.match (reg);  
  if (r==null) return false;  
  R[2]=r[2]-1; VAr d= New Date (R[1],r[2],r[3],r[4],r[5],r[6]);  
  if (D.getfullyear ()!=r[1]) return false;  
  if (D.getmonth ()!=r[2]) return false;  
  if (D.getdate ()!=r[3]) return false;  
  if (D.gethours ()!=r[4]) return false;  
  if (D.getminutes ()!=r[5]) return false;  
  if (D.getseconds ()!=r[6]) return false;  
return true; }  
 
//+--------------------------------------------------- 
//| Dividing dates into groups//+---------------------------------------------------Date.prototype.toArray = function () {var mydate = 
  This 
  var myarray = Array (); 
  Myarray[0] = Mydate.getfullyear (); 
  MYARRAY[1] = Mydate.getmonth (); 
  MYARRAY[2] = Mydate.getdate (); 
  MYARRAY[3] = mydate.gethours (); 
  MYARRAY[4] = Mydate.getminutes (); 
  MYARRAY[5] = Mydate.getseconds (); 
return myarray; } 
 
//+--------------------------------------------------- 
//| Get Date data Information//| The parameter interval represents the data type//| Y year M month d days W week WW Week h when N minute s sec//+---------------------------------------------------Date.prototype.DatePart = function (int Erval)
{var mydate = this; 
  var partstr= '; 
  var Week = [' Day ', ' one ', ' two ', ' three ', ' four ', ' five ', ' six ']; 
    Switch (interval) {case ' y ':p artstr = Mydate.getfullyear (); 
    Case ' m ':p artstr = Mydate.getmonth () +1;break; 
    Case ' d ':p artstr = Mydate.getdate (); 
    Case ' W ':p artstr = Week[mydate.getday ()];break; 
    Case ' ww ':p artstr = Mydate.weeknumofyear (); 
    Case ' h ':p artstr = mydate.gethours (); 
    Case ' n ':p artstr = Mydate.getminutes (); 
  Case ' s ':p artstr = Mydate.getseconds (); 
return partstr; } 
 
//+--------------------------------------------------- 
//| Gets the maximum number of days in the month of the current date//+---------------------------------------------------Date.prototype.MaxDayOfDate = function () {VA 
  R mydate = this; 
  var ary = Mydate.toarray (); 
  var date1 = (new Date (ary[0],ary[1]+1,1)); 
  var date2 = date1.dateadd (1, ' m ', 1); var result = DateDiff (date1. Format (' Yyyy-mm-dd '), Date2. 
  Format (' yyyy-mm-dd ')); 
return result; } 
 
//+--------------------------------------------------- 
//| 
Get the current date the week is the week ordinal of the year//+---------------------------------------------------Date.prototype.WeekNumOfYear = function () 
  {var mydate = this; 
  var ary = Mydate.toarray (); 
  var year = ary[0]; 
  var month = ary[1]+1; 
  var day = ary[2]; 
  document.write (' < script language=vbscript\> \ n '); 
  document.write (' mydate = Datue (' +month+ '-' +day+ '-' +year+ '); 
  document.write (' result = DatePart (' ww ', mydate) \ n '); 
  document.write (' \ n '); 
return result; } 
 
//+--------------------------------------------------- 
//| string is converted to date type//| Format mm/dd/yyyy mm-dd-yyyy yyyy/mm/dd yyyy-mm-dd//+---------------------------------------------------function 
  Stringtodate (Datestr) {var converted = Date.parse (DATESTR); 
  var mydate = new Date (converted); if (isNaN (mydate)) {//var Delimcahar = datestr.indexof ('/')!=-1? ' 
    /':'-'; 
    var arys= datestr.split ('-'); 
  MyDate = new Date (Arys[0],--arys[1],arys[2]); } RETurn mydate; 
 }

If you want to implement a clock like this:
December 03, 2012 17:21:16 Monday

 Local clock
function Clockon () {
  var now = new Date ();
  var year = Now.getfullyear (); getFullYear getyear
  var month = Now.getmonth ();
  var date = Now.getdate ();
  var day = Now.getday ();
  var hour = now.gethours ();
  var minu = Now.getminutes ();
  var sec = Now.getseconds ();
  Var week;
  Month = month + 1;
  if (Month <) month = "0" + month;
  if (date < ten) date = "0" + date;
  if (hour <) hour = "0" + hour;
  if (Minu <) Minu = "0" + minu;
  if (sec <) sec = "0" + sec;
  var arr_week = new Array ("Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday");
  Week = Arr_week[day];
  var time = "";
  Time = year + "years" + month + "Month" + Date + "Day" + "+ Hour +": "+ Minu +": "+ sec +" "+ Week;
 
  $ ("#bgclock"). HTML (time);
 
  var timer = settimeout ("Clockon ()");
}

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