I want to provide user to select date time using some control. For that

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Asked: May 22, 20262026-05-22T14:29:35+00:00 2026-05-22T14:29:35+00:00

I want to provide user to select date time using some control. For that

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I want to provide user to select date time using some control. For that I tried using Javascript datetime picker which I directly copy and past from the internet but its not working. I got it from here.

Please help me in solving this problem. Is there any other way to provide user with this facility? I am using ASP.NET C#. I am completely new in javascript as well as Jquery.

//Here is the code for java script.
//Javascript name: My Date Time Picker
//Date created: 16-Nov-2003 23:19
//Scripter: TengYong Ng
//Website: http://www.rainforestnet.com
//Copyright (c) 2003 TengYong Ng
//FileName: DateTimePicker.js
//Version: 0.8
//Contact: contact@rainforestnet.com
// Note: Permission given to use this script in ANY kind of applications if
// header lines are left unchanged.

//Global variables
var winCal;
var dtToday=new Date();
var Cal;
var docCal;
var MonthName=[“January”, “February”, “March”, “April”, “May”, “June”,”July”,
“August”, “September”, “October”, “November”, “December”];
var WeekDayName= [“Sunday”,”Monday”,”Tuesday”,”Wednesday”,”Thursday”,”Friday”,”Saturday”];
var exDateTime;//Existing Date and Time

//Configurable parameters
var cnTop="200";//top coordinate of calendar window.
var cnLeft="500";//left coordinate of calendar window
var WindowTitle ="DateTime Picker";//Date Time Picker title.
var WeekChar=2;//number of character for week day. if 2 then Mo,Tu,We. if 3 then  Mon,Tue,Wed.
var CellWidth=20;//Width of day cell.
var DateSeparator="-";//Date Separator, you can change it to "/" if you want.
var TimeMode=24;//default TimeMode value. 12 or 24

 var ShowLongMonth=true;//Show long month name in Calendar header. example: "January".
var ShowMonthYear=true;//Show Month and Year in Calendar header.
var MonthYearColor="#cc0033";//Font Color of Month and Year in Calendar header.
var WeekHeadColor="#0099CC";//Background Color in Week header.
var SundayColor="#6699FF";//Background color of Sunday.
var SaturdayColor="#CCCCFF";//Background color of Saturday.
var WeekDayColor="white";//Background color of weekdays.
var FontColor="blue";//color of font in Calendar day cell.
var TodayColor="#FFFF33";//Background color of today.
var SelDateColor="#FFFF99";//Backgrond color of selected date in textbox.
var YrSelColor="#cc0033";//color of font of Year selector.
var ThemeBg="";//Background image of Calendar window.
//end Configurable parameters
//end Global variable

function NewCal(pCtrl,pFormat,pShowTime,pTimeMode)
{

    alert('Hi Calender');
Cal=new Calendar(dtToday);
if ((pShowTime!=null) && (pShowTime))
{
    Cal.ShowTime=true;
    if ((pTimeMode!=null) &&((pTimeMode=='12')||(pTimeMode=='24')))
    {
        TimeMode=pTimeMode;
    }       
}   
if (pCtrl!=null)
    Cal.Ctrl=pCtrl;
if (pFormat!=null)
    Cal.Format=pFormat.toUpperCase();

exDateTime=document.getElementById(pCtrl).value;
if (exDateTime!="")//Parse Date String
{
    var Sp1;//Index of Date Separator 1
    var Sp2;//Index of Date Separator 2 
    var tSp1;//Index of Time Separator 1
    var tSp1;//Index of Time Separator 2
    var strMonth;
    var strDate;
    var strYear;
    var intMonth;
    var YearPattern;
    var strHour;
    var strMinute;
    var strSecond;
    //parse month
    Sp1=exDateTime.indexOf(DateSeparator,0)
    Sp2=exDateTime.indexOf(DateSeparator,(parseInt(Sp1)+1));

    if ((Cal.Format.toUpperCase()=="DDMMYYYY") ||  (Cal.Format.toUpperCase()=="DDMMMYYYY"))
    {
        strMonth=exDateTime.substring(Sp1+1,Sp2);
        strDate=exDateTime.substring(0,Sp1);
    }
    else if ((Cal.Format.toUpperCase()=="MMDDYYYY") || (Cal.Format.toUpperCase()=="MMMDDYYYY"))
    {
        strMonth=exDateTime.substring(0,Sp1);
        strDate=exDateTime.substring(Sp1+1,Sp2);
    }
    if (isNaN(strMonth))
        intMonth=Cal.GetMonthIndex(strMonth);
    else
        intMonth=parseInt(strMonth,10)-1;   
    if ((parseInt(intMonth,10)>=0) && (parseInt(intMonth,10)<12))
        Cal.Month=intMonth;
    //end parse month
    //parse Date
    if ((parseInt(strDate,10)<=Cal.GetMonDays()) && (parseInt(strDate,10)>=1))
        Cal.Date=strDate;
    //end parse Date
    //parse year
    strYear=exDateTime.substring(Sp2+1,Sp2+5);
    YearPattern=/^\d{4}$/;
    if (YearPattern.test(strYear))
        Cal.Year=parseInt(strYear,10);
    //end parse year
    //parse time
    if (Cal.ShowTime==true)
    {
        tSp1=exDateTime.indexOf(":",0)
        tSp2=exDateTime.indexOf(":",(parseInt(tSp1)+1));
        strHour=exDateTime.substring(tSp1,(tSp1)-2);
        Cal.SetHour(strHour);
        strMinute=exDateTime.substring(tSp1+1,tSp2);
        Cal.SetMinute(strMinute);
        strSecond=exDateTime.substring(tSp2+1,tSp2+3);
        Cal.SetSecond(strSecond);
    }   
}
 winCal=window.open("","DateTimePicker","toolbar=0,status=0,menubar=0,fullscreen=no,width=195,height=245,resizable=0,top="+cnTop+",left="+cnLeft);
docCal=winCal.document;
RenderCal();
}

function RenderCal()
{
var vCalHeader;
var vCalData;
var vCalTime;
var i;
var j;
var SelectStr;
var vDayCount=0;
var vFirstDay;

docCal.open();
docCal.writeln("<html><head><title>"+WindowTitle+"</title>");
docCal.writeln("<script>var winMain=window.opener;</script>");
docCal.writeln("</head><body background='"+ThemeBg+"' link="+FontColor+" vlink="+FontColor+"><form name='Calendar'>");

vCalHeader="<table border=1 cellpadding=1 cellspacing=1 width='100%' align=\"center\" valign=\"top\">\n";
//Month Selector
vCalHeader+="<tr>\n<td colspan='7'><table border=0 width='100%' cellpadding=0 cellspacing=0><tr><td align='left'>\n";
vCalHeader+="<select name=\"MonthSelector\" onChange=\"javascript:winMain.Cal.SwitchMth(this.selectedIndex);winMain.RenderCal();\">\n";
for (i=0;i<12;i++)
{
    if (i==Cal.Month)
        SelectStr="Selected";
    else
        SelectStr="";   
    vCalHeader+="<option "+SelectStr+" value >"+MonthName[i]+"\n";
}
vCalHeader+="</select></td>";
//Year selector
vCalHeader+="\n<td align='right'><a href=\"javascript:winMain.Cal.DecYear();winMain.RenderCal()\"><b><font color=\""+YrSelColor+"\"><</font></b></a><font face=\"Verdana\" color=\""+YrSelColor+"\" size=2><b> "+Cal.Year+" </b></font><a href=\"javascript:winMain.Cal.IncYear();winMain.RenderCal()\"><b><font color=\""+YrSelColor+"\">></font></b></a></td></tr></table></td>\n";   
vCalHeader+="</tr>";
//Calendar header shows Month and Year
if (ShowMonthYear)
    vCalHeader+="<tr><td colspan='7'><font face='Verdana' size='2' align='center' color='"+MonthYearColor+"'><b>"+Cal.GetMonthName(ShowLongMonth)+" "+Cal.Year+"</b></font></td></tr>\n";
//Week day header
vCalHeader+="<tr bgcolor="+WeekHeadColor+">";
for (i=0;i<7;i++)
{
    vCalHeader+="<td align='center'><font face='Verdana' size='2'>"+WeekDayName[i].substr(0,WeekChar)+"</font></td>";
}
vCalHeader+="</tr>";    
docCal.write(vCalHeader);

//Calendar detail
CalDate=new Date(Cal.Year,Cal.Month);
CalDate.setDate(1);
vFirstDay=CalDate.getDay();
vCalData="<tr>";
for (i=0;i<vFirstDay;i++)
{
    vCalData=vCalData+GenCell();
    vDayCount=vDayCount+1;
}
for (j=1;j<=Cal.GetMonDays();j++)
{
    var strCell;
    vDayCount=vDayCount+1;
    if ((j==dtToday.getDate())&&(Cal.Month==dtToday.getMonth())&&(Cal.Year==dtToday.getFullYear()))
        strCell=GenCell(j,true,TodayColor);//Highlight today's date
    else
    {
        if (j==Cal.Date)
        {
            strCell=GenCell(j,true,SelDateColor);
        }
        else
        {    
            if (vDayCount%7==0)
                strCell=GenCell(j,false,SaturdayColor);
            else if ((vDayCount+6)%7==0)
                strCell=GenCell(j,false,SundayColor);
            else
                strCell=GenCell(j,null,WeekDayColor);
        }       
    }                       
    vCalData=vCalData+strCell;

    if((vDayCount%7==0)&&(j<Cal.GetMonDays()))
    {
        vCalData=vCalData+"</tr>\n<tr>";
    }
}
docCal.writeln(vCalData);   
//Time picker
if (Cal.ShowTime)
{
    var showHour;
    showHour=Cal.getShowHour();     
    vCalTime="<tr>\n<td colspan='7' align='center'>";
    vCalTime+="<input type='text' name='hour' maxlength=2 size=1 style=\"WIDTH: 22px\" value="+showHour+" onchange=\"javascript:winMain.Cal.SetHour(this.value)\">";
    vCalTime+=" : ";
    vCalTime+="<input type='text' name='minute' maxlength=2 size=1 style=\"WIDTH: 22px\" value="+Cal.Minutes+" onchange=\"javascript:winMain.Cal.SetMinute(this.value)\">";
    vCalTime+=" : ";
    vCalTime+="<input type='text' name='second' maxlength=2 size=1 style=\"WIDTH: 22px\" value="+Cal.Seconds+" onchange=\"javascript:winMain.Cal.SetSecond(this.value)\">";
    if (TimeMode==12)
    {
        var SelectAm =(parseInt(Cal.Hours,10)<12)? "Selected":"";
        var SelectPm =(parseInt(Cal.Hours,10)>=12)? "Selected":"";

        vCalTime+="<select name=\"ampm\" onchange=\"javascript:winMain.Cal.SetAmPm(this.options[this.selectedIndex].value);\">";
        vCalTime+="<option "+SelectAm+" value=\"AM\">AM</option>";
        vCalTime+="<option "+SelectPm+" value=\"PM\">PM<option>";
        vCalTime+="</select>";
    }   
    vCalTime+="\n</td>\n</tr>";
    docCal.write(vCalTime);
}   
//end time picker
docCal.writeln("\n</table>");
docCal.writeln("</form></body></html>");
docCal.close();

}

function GenCell(pValue,pHighLight,pColor)//Generate table cell with value
{
var PValue;
var PCellStr;
var vColor;
var vHLstr1;//HighLight string
var vHlstr2;
var vTimeStr;

if (pValue==null)
    PValue="";
else
    PValue=pValue;

if (pColor!=null)
    vColor="bgcolor=\""+pColor+"\"";
else
    vColor="";  
if ((pHighLight!=null)&&(pHighLight))
    {vHLstr1="color='red'><b>";vHLstr2="</b>";}
else
    {vHLstr1=">";vHLstr2="";}   

if (Cal.ShowTime)
{
    vTimeStr="winMain.document.getElementById('"+Cal.Ctrl+"').value+=' '+"+"winMain.Cal.getShowHour()"+"+':'+"+"winMain.Cal.Minutes"+"+':'+"+"winMain.Cal.Seconds";
    if (TimeMode==12)
        vTimeStr+="+' '+winMain.Cal.AMorPM";
}   
else
    vTimeStr="";        
PCellStr="<td "+vColor+" width="+CellWidth+" align='center'><font face='verdana' size='2'"+vHLstr1+"<a href=\"javascript:winMain.document.getElementById('"+Cal.Ctrl+"').value='"+Cal.FormatDate(PValue)+"';"+vTimeStr+";window.close();\">"+PValue+"</a>"+vHLstr2+"</font></td>";
return PCellStr;

}

function Calendar(pDate,pCtrl)
{
//Properties
this.Date=pDate.getDate();//selected date
this.Month=pDate.getMonth();//selected month number
this.Year=pDate.getFullYear();//selected year in 4 digits
this.Hours=pDate.getHours();    

if (pDate.getMinutes()<10)
    this.Minutes="0"+pDate.getMinutes();
else
    this.Minutes=pDate.getMinutes();

if (pDate.getSeconds()<10)
    this.Seconds="0"+pDate.getSeconds();
else        
    this.Seconds=pDate.getSeconds();

this.MyWindow=winCal;
this.Ctrl=pCtrl;
this.Format="ddMMyyyy";
this.Separator=DateSeparator;
this.ShowTime=false;
if (pDate.getHours()<12)
    this.AMorPM="AM";
else
    this.AMorPM="PM";   
}

function GetMonthIndex(shortMonthName)
{
for (i=0;i<12;i++)
{
    if (MonthName[i].substring(0,3).toUpperCase()==shortMonthName.toUpperCase())
    {   return i;}
}
}
Calendar.prototype.GetMonthIndex=GetMonthIndex;

function IncYear()
{   Cal.Year++;}
Calendar.prototype.IncYear=IncYear;

function DecYear()
{   Cal.Year--;}
Calendar.prototype.DecYear=DecYear;

function SwitchMth(intMth)
{   Cal.Month=intMth;}
Calendar.prototype.SwitchMth=SwitchMth;

function SetHour(intHour)
{   
var MaxHour;
var MinHour;
if (TimeMode==24)
{   MaxHour=23;MinHour=0}
else if (TimeMode==12)
{   MaxHour=12;MinHour=1}
else
    alert("TimeMode can only be 12 or 24");     
var HourExp=new RegExp("^\\d\\d$");
if (HourExp.test(intHour) && (parseInt(intHour,10)<=MaxHour) && (parseInt(intHour,10)>=MinHour))
{   
    if ((TimeMode==12) && (Cal.AMorPM=="PM"))
    {
        if (parseInt(intHour,10)==12)
            Cal.Hours=12;
        else    
            Cal.Hours=parseInt(intHour,10)+12;
    }   
    else if ((TimeMode==12) && (Cal.AMorPM=="AM"))
    {
        if (intHour==12)
            intHour-=12;
        Cal.Hours=parseInt(intHour,10);
    }
    else if (TimeMode==24)
        Cal.Hours=parseInt(intHour,10); 
}
}
Calendar.prototype.SetHour=SetHour;

function SetMinute(intMin)
{
var MinExp=new RegExp("^\\d\\d$");
if (MinExp.test(intMin) && (intMin<60))
    Cal.Minutes=intMin;
}
Calendar.prototype.SetMinute=SetMinute;

function SetSecond(intSec)

{
var SecExp=new RegExp(“^\d\d$”);
if (SecExp.test(intSec) && (intSec<60))
Cal.Seconds=intSec;
}
Calendar.prototype.SetSecond=SetSecond;

function SetAmPm(pvalue)
{
this.AMorPM=pvalue;
if (pvalue=="PM")
{
    this.Hours=(parseInt(this.Hours,10))+12;
    if (this.Hours==24)
        this.Hours=12;
}   
else if (pvalue=="AM")
    this.Hours-=12; 
}
Calendar.prototype.SetAmPm=SetAmPm;

function getShowHour()
{
var finalHour;
    if (TimeMode==12)
    {
    if (parseInt(this.Hours,10)==0)
    {
        this.AMorPM="AM";
        finalHour=parseInt(this.Hours,10)+12;   
    }
    else if (parseInt(this.Hours,10)==12)
    {
        this.AMorPM="PM";
        finalHour=12;
    }       
    else if (this.Hours>12)
    {
        this.AMorPM="PM";
        if ((this.Hours-12)<10)
            finalHour="0"+((parseInt(this.Hours,10))-12);
        else
            finalHour=parseInt(this.Hours,10)-12;   
    }
    else
    {
        this.AMorPM="AM";
        if (this.Hours<10)
            finalHour="0"+parseInt(this.Hours,10);
        else
            finalHour=this.Hours;   
    }
}
else if (TimeMode==24)
{
    if (this.Hours<10)
        finalHour="0"+parseInt(this.Hours,10);
    else    
        finalHour=this.Hours;
}   
return finalHour;   
}               
Calendar.prototype.getShowHour=getShowHour;     

function GetMonthName(IsLong)
{
var Month=MonthName[this.Month];
if (IsLong)
    return Month;
else
    return Month.substr(0,3);
}
Calendar.prototype.GetMonthName=GetMonthName;

function GetMonDays()//Get number of days in a month
{
var DaysInMonth=[31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
if (this.IsLeapYear())
{
    DaysInMonth[1]=29;
}   
return DaysInMonth[this.Month]; 
}
Calendar.prototype.GetMonDays=GetMonDays;

function IsLeapYear()
{
if ((this.Year%4)==0)
{
    if ((this.Year%100==0) && (this.Year%400)!=0)
    {
        return false;
    }
    else
    {
        return true;
    }
}
else
{
    return false;
}
}
Calendar.prototype.IsLeapYear=IsLeapYear;

function FormatDate(pDate)
{
if (this.Format.toUpperCase()=="DDMMYYYY")
    return (pDate+DateSeparator+(this.Month+1)+DateSeparator+this.Year);
else if (this.Format.toUpperCase()=="DDMMMYYYY")
    return (pDate+DateSeparator+this.GetMonthName(false)+DateSeparator+this.Year);
else if (this.Format.toUpperCase()=="MMDDYYYY")
    return ((this.Month+1)+DateSeparator+pDate+DateSeparator+this.Year);
else if (this.Format.toUpperCase()=="MMMDDYYYY")
    return (this.GetMonthName(false)+DateSeparator+pDate+DateSeparator+this.Year);          
}
Calendar.prototype.FormatDate=FormatDate;

Below is the call for javascript function

Here the function NewCal() is being called which I checked by keeping alert message in that function as shown in above code but further script is not executed.

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1 Answer

Editorial Team · Answer 1 · 2026-05-22T14:29:36+00:00

Editorial Team

2026-05-22T14:29:36+00:00Added an answer on May 22, 2026 at 2:29 pm

Quite easy is this. First download JQuery UI from here and include into your page. Then use the following method


<scritp type="text/javascript">
(function($){
    $("#datepicker").datepicker({
    showOn: "button",
    buttonImage: "/images/calendar.gif",
    buttonImageOnly: true
    });
})(jQuery);

Make a textbox with the id datapicker like this

<input type="text" id="datepicker">

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