Unable to click on date from calendar popup - selenium

Question

I wanted to click the date from calendar popup which is inside iframe. I have written below selenium code which throwing unable to locate the element error. Please help me to write correct xpath or selenium code. I am new to Selenium
selenium code:
WebElement iframe =driver.findElement(By.id("NewsSearchDateToInput_selector_iframe"));
driver.switchTo().frame(iframe);
//clicking on date 3
driver.findElement(By.xpath("//div[3][#class='daysNumbersStyles']")).click();
Error: unable to locate the element "//div[3][#class='daysNumbersStyles']"
Html tags:
<iframe id="NewsSearchDateToInput_selector_iframe"
class="dateTimeSelectorContainerStyle altFlexibleContainer"
src="javascript:false;"
style="left: 1216px; top: 245px; width: 249px; height: 207px;
display: block;"/>
<div class="dateTimeSelectorContainerStyle altFlexibleContainer"
style="top: 245px; left: 1216px; display: block;">
<div class="top">
<div class="content">
<div class="dateSelectorHeader">
<div class="dateSelectorBody">
<div class="yearMonthSelectorStyle">
<div id="NewsSearchDateToInput_selector_monthSelector" class="monthSelectorListStyle">
<div class="daysStyle">
<div>
<div class="daysNumbersDivStyle">
<div class="daysNumbersStyles">1</div>
<div class="daysNumbersStyles">2</div>
<div class="daysNumbersStyles">3</div>

Answer 1

does it help ? //div[#class='daysNumbersStyles'][3]

Answer 2

Try this after getting in to frame:
driver.findElement(By.xpath("//div[text()='3']").click();
Edit:
For To selector:
driver.findElement(By.xpath("//*[#id='NewsSearchDateToInput_selector_monthSelector']//div[text()='3']").click();
For From selector:
driver.findElement(By.xpath("//*[#id='NewsSearchDateFromInput_selector_monthSelector']//div[text()='3']").click();