Verificar data de dois datepicker

Tenho o seguinte código e gostaria de fazer a verificação de dois datapickers

isDate: function () {
 var r = true, re = /^(\d{1,2})\/(\d{1,2})\/(\d{4})$/, $this = $(this),val = $(this).val(),
 actualDate = new Date(), splitDate = val.split('/'), insertedDate;
 var maxDate = $this.datepicker("option", "maxDate");

// if (minDate && maxDate) {
// var dataInicial = minDate.toString();
// var dataFinal = maxDate.toString();
// // var novaDataInicial = dataInicial.split("/").reverse().join("-");
// // var novaDataFinal = dataFinal.split("/").reverse().join("-");
// var novaDataInicial = dataInicial.toString();
// var novaDataFinal = dataInicial.toString();
// novaDataInicial = novaDataInicial.split("/").reverse().join("-");
// novaDataFinal = novaDataFinal.split("/").reverse().join("-");

// minDate = novaDataInicial;
// maxDate = novaDataFinal;
 // }

 if (maxDate) {
 var dataInicial = maxDate.toString();
 // var novaDataInicial = dataInicial.split("/").reverse().join("-");
 // var novaDataFinal = dataFinal.split("/").reverse().join("-");
 var novaDataFinal = dataInicial.toString();
 novaDataFinal = novaDataFinal.split("/").reverse().join("-");

 maxDate = novaDataFinal;
 }

 try {
 insertedDate = new Date(splitDate[2] + "-" + splitDate[1] + "-" + splitDate[0] + "T00:00:00Z");
 if ($this.datepicker("getDate") != null) {
 if (regs = val.match(re)) {
 if (regs[1] < 1 || regs[1] > 31) {
 r = false;
 }
 if (regs[2] < 1 || regs[2] > 12) {
 r = false;
 }
 if (regs[3] < 1902 || regs[3] > actualDate.getFullYear()) {
 r = false;
 }

 if ($this.hasClass("maxToday") && insertedDate > actualDate) {
 r = false;
 }
 if ($this.hasClass("minToday") && insertedDate < actualDate) {
 r = false;
 }
 if (insertedDate < new Date('1900-01-01T00:00:00Z')) {
 r = false
 }
 }
 else {
 r = false;
 }
 }
 else {
 r = false;
 }
 return r;
 }
 catch (Error) {
 r = false;
 }
 return r;
 },
if($input.hasClass("data-picker") || $input.hasClass("data-picker-range") || $input.hasClass("datepicker")) && !$input.isDate()) $input.addClass(errorClass);erro=true;

<div class="form-item-label inline ui-widget-content"><span>Período</span></div>
 <input type="text" name="DataInicial" class="data data-picker-range datepicker" /> a <input type="text" name="DataFinal" class="data data-picker-range2 datepicker2 date-picker2"/>

Porém, só consigo pegar o input do maxDate. Como posso fazer para pegar o dos dois?