Date Validation for JavaScript

The below code is check in enter string is current date or previous date, the previous date not include Saturday and Sunday.

ASPX Page

<aspx:TextBox runat="server" id="txtvalid" ></asp:TextBox>

<asp:Button ID="btnsave" Text="Create User" runat="server" OnClientClick="dateValidation(this);"/> 
                 
Script
 

Function dateValidation(evt)

{

  var d=new date();

  var n=d.getDay();

  var text=document.getElementById("txtvalid").value;

  var today=new date();

  var dd=today.getDate();

  var mm=today.getmonth()+1;

  var yyyy=today.getFullYear();

  if(dd<10)

  { dd='0'+dd }

  if(mm<10)

  {mm='0'+mm}

 today=dd+'/'+mm+'/'+yyyy

if(n=1)

 var yest=dd-3;

else

 var yest=dd-1;

 var yestrday=yest+'/'+mm+'/'+yyyy

if(text!=today&&(text!=yesterday))

{

alert('Please Enter current date or previous date'

}

}

Thanks

Sreejesh

}