JS Date Operation class

/* Date Object formatted as specified date format */
Date.prototype.format = function (format) {
var o = {
"m+": This.getmonth () + 1,//month
"D+": This.getdate (),//day
"H +": this.gethours (),//hour
"m+": This.getminutes (),//minute
"S+": This.getseconds (),//second
"q+": Math.floor ((This.getmonth () + 3)/3),//quarter
"S": This.getmilliseconds ()//millisecond
}
if (/(y+)/.test (format)) format = Format.replace (regexp.$1,
(This.getfullyear () + ""). substr (4-regexp.$1.length));
For (var k in O) if (New RegExp ("(" + K + ")"). Test (format))
Format = Format.replace (regexp.$1,
Regexp.$1.length = = 1? O[K]:
("XX" + o[k]). substr (("" + o[k]). length);
return format;
}
/*
* Parameters
*dateobj
* Required option. Any Date object.
*interval
* Required option. A string expression that represents the time interval to add. See the Settings section for values.
*number
* Required option. A numeric expression that represents the number of time intervals to add. A numeric expression can be a positive number (get a future date) or negative (get a date in the past).
The *interval parameter can have the following values:
* Setting description
*y year
*q Quarter
*m Month
*d Day
*w Week
*h hours
*n min
* Date of date, month, day, etc plus number
*/
DATE.PROTOTYPE.DATEADD = function (interval, number) {
var d = this;
var k = {' Y ': ' fullyear ', ' Q ': ' Month ', ' m ': ' Month ', ' W ': ' Date ', ' d ': ' Date ', ' H ': ' Hours ', ' n ': ' Minutes ', ' s ': ' Secon DS ', ' ms ': ' MilliSeconds '};
var n = {' Q ': 3, ' W ': 7};
Eval (' D.set ' + k[interval] + ' (d.get ' + k[interval] + ' () + ' + ((N[interval] | | 1) * number) + ');
return D;
}

/* Calculates dates that differ by two dates, month and day, etc. */
Date.prototype.dateDiff = function (interval, objDate2) {
var d = This, I = {}, T = D.getti Me (), t2 = Objdate2.gettime ();
i[' y '] = objdate2.getfullyear ()-d.getfullyear ();
i[' q '] = i[' y '] * 4 + math.floor (Objdate2.getmonth ()/4)-Math.floor (D.getmonth ()/4);
i[' m '] = i[' y '] * + objdate2.getmonth ()-D.getmonth ();
i[' ms '] = objdate2.gettime ()-d.gettime ();
i[' W '] = Math.floor ((t2 + 345600000)/(604800000))-Math.floor ((t + 345600000)/(604800000));
i[' d '] = Math.floor (t2/86400000)-Math.floor (t/86400000);
i[' h '] = Math.floor (t2/3600000)-Math.floor (t/3600000);
i[' n '] = Math.floor (t2/60000)-Math.floor (t/60000);
i[' s '] = Math.floor (t2/1000)-Math.floor (t/1000);
return I[interval];
}
/* Date string converted to date Object */
Function parsedate (str) {

if (typeof str = = ' string ') {
var results = Str.match (/^ * (\d{4})-(\d{1,2})-(\d{1,2}) *$/);
if (Results && results.length > 3)
return new Date (number (results[1]), number (results[2])-1, Number (results[3]));
Results = Str.match (/^ * (\d{4})-(\d{1,2})-(\d{1,2}) + (\d{1,2}):(\d{1,2}):(\d{1,2});
if (Results && results.length > 6)
return new Date (number (results[1]), number (results[2])-1, Number (results[3]), number (results[4]), number (results[5]) , number (results[6]));
Results = Str.match (/^ * (\d{4})-(\d{1,2})-(\d{1,2}) + (\d{1,2}):(\d{1,2}):(\d{1,2}) \. (\d{1,9}) *$/);
if (Results && results.length > 7)
return new Date (number (results[1]), number (results[2])-1, Number (results[3]), number (results[4]), number (results[5]) , number (results[6]), number (results[7]));

}
return null;
}

function Rain () {
Obj1 = new Date (). Format ("Yyyy-mm-dd hh:mm:ss");
Obj2 = new Date (). Format ("Yyyy-mm-dd");
Obj3 = new Date (). Format ("Yyyy/mm/dd");
Obj4 = new Date (). Format ("mm/dd/yyyy");
Obj5 = new Date (). Format ("Yyyy-mm-dd hh:mm");
Alert ("obj1=" + obj1 + "/n obj2=" + obj2 + "/n obj3=" + obj3 + "/n obj4=" + obj4);
alert (OBJ5);
var str = "2010-1-10 22:10:10";
var dates = parsedate (str);
Alert (Dates.getdate ());
OBJ7 = Dates.format ("Yyyy-mm-dd");
alert (OBJ7);
//}
Rain ();

JS Date Operation class