Calculate difference in weeks using RadDatePicker Control in Javascript

[Rahul Khinvasara]

Hi,
    I am using a RadDatePicker Control on my page. I have to calculate the difference in weeks between the date selected in this RadDatePicker Control and Current Date (i.e Today's Date). I have to display this difference (in weeks)  inside a textbox on selecting a date from the RadDatePicker Control. How can I do this ?


I have used the following html code for RadDatePicker Control in my application :- 

<telerik:RadDatePicker ID="dtDate" runat="server" DateInput-DateFormat="dd/MM/yyyy" Width="120px" Skin="WebBlue">
<DateInput DateFormat="dd/MM/yyyy" LabelCssClass="radLabelCss_WebBlue" Skin="WebBlue" runat="server" ID="DateInput6" >
</DateInput>
<Calendar Skin="WebBlue" Width="50px" Height="50px">
</Calendar>
<DatePopupButton CssClass="radPopupImage_WebBlue" />
</telerik:RadDatePicker>

 

 

 

 

 

Thanks

 

 

 

 

[Dimo]

Hello Rahul,

Your task is to calculate the difference between two Javascript Date objects. In order to do that, please get familiar with the Javascript Date object API:

http://www.w3schools.com/jsref/jsref_obj_date.asp


After you create your calculation algorithm, use the RadDatePicker's DateSelected client event to get the newly selected date:

http://www.telerik.com/help/aspnet-ajax/calendar_clientsideondateselected.html

<telerik:RadDatePicker ID="RadDatePicker1" runat="server">
    <ClientEvents OnDateSelected="MyDateSelected" />
</telerik:RadDatePicker>


Regards,
Dimo
the Telerik team

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[Shinu]

Hi Rahul,

Try the following client side code for retrieving the difference in weeks numbers between today's and selected date.

ASPX:

<telerik:RadCalendar ID="RadCalendar1" runat="server">
<ClientEvents OnDateSelected="OnDateSelected" />
</telerik:RadCalendar>

JavaScript:

<script type="text/javascript">
function Week()
{
    Date.prototype.getMDay = function()
    {
    return (this.getDay() + 6) %7;}
    Date.prototype.getISOYear = function() {
    var thu = new Date(this.getFullYear(), this.getMonth(), this.getDate()+3-this.getMDay());
    return thu.getFullYear();}
    Date.prototype.getISOWeek = function() {
    var onejan = new Date(this.getISOYear(),0,1);
    var wk = Math.ceil((((this - onejan) / 86400000) + onejan.getMDay()+1)/7);
    if (onejan.getMDay() > 3) wk--;return wk;}
    var today = new Date();
    return today.getISOWeek();
}
function OnDateSelected(sender, eventArgs)
{
    var WeekOfYear = eventArgs.get_renderDay().RadCalendarView.GetWeekOfYear(eventArgs.get_renderDay().get_date())
    var WeekOfToday = Week();
   // alert(WeekOfYear);
   // alert(WeekOfToday);
    var diff = WeekOfToday - WeekOfYear;
    alert(diff);
}
</script>

-Shinu.