Date operation class DateTime function code implemented in js_javascript skills

//Represents a moment in time, usually expressed as a date and time of day.
function DateTime(year, month, day, hour, min, sec, millisec){
var d = new Date();

if (year || year == 0){
d.setFullYear(year);
}
if (month || month == 0){
d.setMonth(month - 1);
}
if (day | | day == 0){
d.setDate(day);
}
if (hour || hour == 0){
d.setHours(hour);
}
if (min || min == 0){
d.setMinutes(min);
}
if (sec || sec == 0){
d.setSeconds(sec) ;
}
if (millisec || millisec == 0){
d.setMilliseconds(millisec);
}
//Add the specified number of days to the value of this instance.
this.AddDays = function(value){
if(!ValidateAddMethodParam(value)){
return null;
var result = this.Clone(); result .GetValue().setDate(result.GetDay() value);
              return result;
this.AddHours = function(value){
if(!ValidateAddMethodParam(value)){
return null;
var result = this.Clone(); result .GetValue().setHours(result.GetHour() value);
             return result;
this.AddMinutes = function(value){
if(!ValidateAddMethodParam(value)){
return null;
var result = this.Clone(); result .GetValue().setMinutes(result.GetMinute() value);
              return result;
this.AddMilliseconds = function(value){
if(!ValidateAddMethodParam(value)){
return null;
var result = this.Clone(); result .GetValue().setMilliseconds(result.GetMillisecond() value);
    return result;
  }
 //Add the specified number of months to the value of this instance.
this.AddMonths = function(value){
if(!ValidateAddMethodParam(value)){
return null;
var result = this.Clone(); result .GetValue().setMonth(result.GetValue().getMonth() value);
    return result;
  }
  //Add the specified number of seconds to the value of this instance.
this.AddSeconds = function(value){
if(!ValidateAddMethodParam(value)){
return null;
var result = this.Clone(); result .GetValue().setSeconds(result.GetSecond() value);
    return result;
  }
 //Add the specified number of years to the value of this instance.
this.AddYears = function(value){
if(!ValidateAddMethodParam(value)){
return null;
var result = this.Clone(); result .GetValue().setFullYear(result.GetYear() value);
                return result; , equal to or later than the specified Date value.
this.CompareTo = function(other){
var internalTicks = other.getTime();
var num2 = d.getTime();
if (num2 > internalTicks)
{
return 1;
}
if (num2 < internalTicks)
{
return -1;
return 0;
}
// Return a new DateTime object with the same value
this.Clone = function(){
return new DateTime(
Day ()
, this.GetHour()
,this.GetMinute()
,this.GetSecond()
,this.GetMillisecond());
}
//Return A value indicating whether this instance is equal to the specified DateTime instance.
this.Equals = function(other){
return this.CompareTo(other) == 0;
}
//Get the date part of this instance.
this.GetDate = function(){
var result = new DateTime(d.getFullYear(), d.getMonth(), d.getDate(), 0, 0, 0, 0);
return result ;
}
//Get the day of the month represented by this instance.
this.GetDay = function(){
return d.getDate();
}
//Get the day of the week represented by this instance.
this.GetDayOfWeek = function(){
return d.getDay();
}
//Get the hour part of the date represented by this instance.
this.GetHour = function(){
return d.getHours();
}
//Get the minute part of the date represented by this instance.
this.GetMinute = function(){
return d.getMinutes();
}
//Get the millisecond part of the date represented by this instance.
this.GetMillisecond = function(){
return d.getMilliseconds();
}
//Get the month part of the date represented by this instance.
this.GetMonth = function(){
return d.getMonth() 1;
}
//Get the DateTime object for the first day of the next month for this instance
this.GetNextMonthFirstDay = function(){
var result = new DateTime(this.GetYear(), this.GetMonth(), 1, 0, 0, 0, 0);
result = result.AddMonths(1);
         return result; return result.AddDays(7 - result.GetDayOfWeek());
}
//Get the DateTime object of the next Sunday for this instance
this.GetNextYearFirstDay = function(){
return new DateTime(this.GetYear() 1, 1, 1, 0, 0, 0, 0);
}
} //Get the seconds part of the date represented by this instance.
this.GetSecond = function(){
return d.getSeconds();
}
//Return the Date value of this instance
this.GetValue = function(){
return d;
}
 //Get the year part of the date represented by this instance.
this.GetYear = function(){
return d.getFullYear();
}
//Indicate whether this instance is a DateTime object
this.IsDateTime = function(){}
//Convert the value of the current DateTime object to its equivalent short date string representation.
this.ToShortDateString = function(){
var result = "";
result = d.getFullYear() "-" (d.getMonth() 1) "-" d.getDate();
          return result;                                                                                                                                                                                                                                                                                     
this.ToShortTimeString = function(){
var result = "";
result = d.getHours() ":" d.getMinutes() ":" d.getSeconds();
return result; 
 }
 //Convert the value of the current DateTime object to its equivalent string representation.
this.ToString = function(format){
if(typeof(format) == "string"){

}
return this.ToShortDateString() " " this.ToShortTimeString( ;
                                                                                                                                                                  🎜>}

//Compares two instances of DateTime and returns an indication of their relative values.
DateTime.Compare = function(d1, d2){
return d1.CompareTo(d2);
}
//Return the number of days in the specified year and month.
DateTime.DaysInMonth = function(year, month){
if ((month < 1) || (month > 12))
{
return "month[" month "] exceeds Range";
}
var numArray = DateTime.IsLeapYear(year) ? DateTime.DaysToMonth366 : DateTime.DaysToMonth365;
return (numArray[month] - numArray[month - 1]);
}
//Returns a value indicating whether two instances of DateTime are equal.
DateTime.Equals = function(d1, d2){
return d1.CompareTo(d2) == 0;
}
//Returns an indication of whether the specified year is a leap year.
DateTime.IsLeapYear = function(year)
{
if ((year < 1) || (year > 0x270f))
{
return "year[" year "] Out of range";
}
if ((year % 4) != 0)
{
return false;
}
if ((year % 100) == 0)
{
return ((year % 400) == 0);
}
return true;
}
//Get a DateTime object, which is set on this computer The current date and time of , expressed as local time.
DateTime.Now = new DateTime();
//Convert the specified string representation of date and time to its DateTime equivalent.
DateTime.Parse = function(s){
var result = new DateTime();
var value = result.GetValue();
value.setHours(0,0,0,0) ;
var dateRex = /b[1-2][0-9][0-9][0-9][-]d{1,2}[-]d{1,2}b/i ;
if(dateRex.test(s)){
var dateStr = s.match(dateRex)[0];
try{
var dateParts = dateStr.split("-");
var Year = Dateparts [0] -0;
var Month = Dateparts [1] - 1;
var day = dateparts [2] -0;
Value.setFullyear day ); ,2}b/i;
if(timeRex.test(s)){
var timeStr = s.match(timeRex)[0];
try{
var timeParts = timeStr.split (":");
var hour = timeParts[0] - 0;
var min = timeParts[1] - 0;
var sec = timeParts[2] - 0;
value. sethouse (hour, min, sec);
} catch (ex) {
}
}
} else {
Return null;
}
RETURN Result ;
}
//Get the current date with its time component set to 00:00:00.
DateTime.Today = new DateTime(null, null, null, 0, 0, 0, 0);

//Static field
DateTime.DaysToMonth365 = [ 0, 0x1f, 0x3b, 90 , 120, 0x97, 0xb5, 0xd4, 0xf3, 0x111, 0x130, 0x14e, 0x16d ];
DateTime.DaysToMonth366 = [ 0, 0x1f, 60, 0x5b, 0x79, 0x98, 0xb6, 0xd5, 0xf4, 0x112, 0x131, 0x14f, 0x16e ];