Objective:

To ensure that the "From Date" and "To Date" set in the two Date Picker fields do not fall before the current date, and that the end date is later than the start date

Code:
<script>
var startDateFieldName = "fromDate";
var endDateFieldName = "toDate";

$(document).ready(function(){
        $.datepicker.setDefaults({
                onSelect: function( selectedDate ) {
                        setDateRange(this, selectedDate);
                }
        });
        setTodayDate();
});

//set the date limit based on value. If does not present, set to current date.
function setTodayDate(){
        var date1_string = $("[name="+startDateFieldName+"]").val();
        var date2_string = $("[name="+endDateFieldName+"]").val();

        if (date1_string == "" && date2_string == ""){
                $("[name="+startDateFieldName+"], [name="+endDateFieldName+"]").datepicker( "option", "minDate", new Date());
        } else {
                if (date1_string != "") {
                        setDateRange($("[name="+startDateFieldName+"]"), date1_string);
                }
                if (date2_string != "") {
                        setDateRange($("[name="+endDateFieldName+"]"), date2_string);
                }
        }
}

//function to set min & max date
function setDateRange(element, selectedDate) {
        var option = $(element).attr("name") == startDateFieldName ? "minDate" : "maxDate";
        var instance = $(element).data( "datepicker" );
        var date = $.datepicker.parseDate(
                instance.settings.dateFormat ||
            $.datepicker._defaults.dateFormat
            ,selectedDate, instance.settings );
        $("[name="+startDateFieldName+"], [name="+endDateFieldName+"]").not(element).datepicker( "option", option, date );
}
</script>
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