DatePicker for POST

<apex:page language="en" showHeader="false" sidebar="false" standardStylesheets="true">
    <link type="text/css" href="https://ajax.googleapis.com/ajax/libs/jqueryui/1.8.6/themes/cupertino/jquery-ui.css" rel="stylesheet" />
    <script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.6.4/jquery.js"></script>
  <!--<script type="text/javascript" src="https://jquery-ui.googlecode.com/svn/trunk/ui/i18n/jquery.ui.datepicker-en-GB.js"></script>
  -->
    <script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jqueryui/1.8.16/jquery-ui.js"></script>


<apex:pageBlock title="Please select the start and end dates:">
        <input type="radio" id="current" name="year" value="current" checked="true"/>Current Fiscal Year
        <input type="radio" id="last" name="year" value="last" />Last Fiscal Year

    <p>Start Date:<br /><input id="startDate" type="textbox"/></p>
    <p>End Date:<br /><input id="endDate" type="textbox"/></p>

             <!--
        $(selector).datepicker({defaultDate: '01/26/2009'});
    $(selector).datepicker({
        defaultDate: new Date(2014, 09, 31 )});
    $(selector).datepicker({defaultDate: +7});
    $(selector).datepicker({defaultDate: '+1m -1d'});
            $("#startDate").datepicker('setDate', '-1w'); // This is optional
       -->


   <script type="text/javascript">
    $(function() {
        $("#startDate").datepicker();  // You must leave this line
        $("#startDate").datepicker($.datepicker.regional['en-GB']);
        $("#startDate").datepicker('setDate', '-1w'); // This is optional
        $("#endDate").datepicker(); // You must leave this line
        $("#endDate").datepicker($.datepicker.regional['en-GB']);
        $("#endDate").datepicker('setDate', '+1w'); // This is optional

        $("#current").click(function(){
            setDate("Current");
        });
        $("#last").click(function(){
            setDate("Last");
        });
        //By Default sets the dates for the current fiscal year
        setDate("Current");
    });

    // Sets the StartDate and EndDate predicated on the fiscal year
    function setDate(fiscalYear){
        var currentDate = new Date(); //Current Date
        var startDate;
        var endDate;
        var year = currentDate.getFullYear(); //Current Year

        if(currentDate.getMonth() >= 8){ //If the month is equal or greater than September
            if(fiscalYear == 'Current'){ //If Current Fiscal year is selected
                startDate= new Date(year, 8,1,0,0,0,0);
                endDate = new Date(year+1, 7,31,0,0,0,0);
            }
            else{
                startDate= new Date(year-1, 8,1,0,0,0,0);
                endDate = new Date(year, 7,31,0,0,0,0);
            }
        }
        else{
            if(fiscalYear == 'Current'){
                startDate= new Date(year-1, 8,1,0,0,0,0);
                endDate = new Date(year, 7,31,0,0,0,0);
            }
            else{
                startDate= new Date(year-2, 8,1,0,0,0,0);
                endDate = new Date(year-1, 7,31,0,0,0,0);
            }
        }

        $("#startDate").datepicker('setDate', startDate);
        $("#endDate").datepicker('setDate', endDate);

    }

    </script>
    <br />
    <input type="button" onclick="launchConga()" value="Launch" />

    <script>
    function launchConga(){
        var startDate = document.getElementById("startDate");
        var endDate = document.getElementById("endDate");

        // For Queries...
        var sDate = new Date(startDate.value);
        var eDate = new Date(endDate.value);
        var startDateForQueries = sDate.getFullYear() + "-" + ("0" + (sDate.getMonth() + 1)).slice(-2) + "-" + ("0" + sDate.getDate()).slice(-2);
        var endDateForQueries = eDate.getFullYear() + "-" + ("0" + (eDate.getMonth() + 1)).slice(-2) + "-" + ("0" + eDate.getDate()).slice(-2);
        var lastStartDateForQueries = sDate.getFullYear()-1 + "-" + ("0" + (sDate.getMonth() + 1)).slice(-2) + "-" + ("0" + sDate.getDate()).slice(-2);
        var lastEndDateForQueries = eDate.getFullYear()-1 + "-" + ("0" + (eDate.getMonth() + 1)).slice(-2) + "-" + ("0" + eDate.getDate()).slice(-2);
        var nextStartDateForQueries = sDate.getFullYear()+1 + "-" + ("0" + (sDate.getMonth() + 1)).slice(-2) + "-" + ("0" + sDate.getDate()).slice(-2);
        var nextEndDateForQueries = eDate.getFullYear()+1 + "-" + ("0" + (eDate.getMonth() + 1)).slice(-2) + "-" + ("0" + eDate.getDate()).slice(-2);


        var url = "{!$currentpage.url}"; //Sapnil
        //alert("{!$currentpage.url}");

        //var qsIndex = window.parent.location.href.indexOf('?') + 1;
        var qsIndex =  url.indexOf('?') + 1;; //Sapnil

        //var qs = window.parent.location.href.substring(qsIndex, window.parent.location.href.length);
        var qs = url.substring(qsIndex, url.length);     //Sapnil
        qs = unescape(qs);

        // Use these lines if you're passing to Reports:
        qs = qs.replace(/{StartDateR}/g , startDate.value);
        //alert(qs);
        qs = qs.replace(/{EndDateR}/g , endDate.value);

        // Use these lines if you're passing to Queries:
        qs = qs.replace(/{StartDateQ}/g, startDateForQueries );
        qs = qs.replace(/{EndDateQ}/g, endDateForQueries );
        qs = qs.replace(/{LastStartDateQ}/g, lastStartDateForQueries );
        qs = qs.replace(/{LastEndDateQ}/g, lastEndDateForQueries );
        qs = qs.replace(/{NextStartDateQ}/g, nextStartDateForQueries );
        qs = qs.replace(/{NextEndDateQ}/g, nextEndDateForQueries );

        //Sapnil
        //qs =  qs.replace(/QueryId\d/gi, "QueryId");
        qs =  qs.replace(/QueryId\d+/gi, "QueryId");
        qs =  qs.replace(/ReportId\d+/gi, "ReportId");
        //alert(qs);

        window.parent.location.href = "https://composer.congamerge.com?" + qs;
    }
    </script>
</apex:pageBlock>

</apex:page>