How to select desired date from the calendar pop-up ?

import java.util.concurrent.TimeUnit;

import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.firefox.FirefoxDriver;

public class CalenderPopUp {
   
     public static void main(String[] args) {
     int day, month, year;
   
     String futrDate = "td_"+2015+"_"+06+"_"+24; //this is the 'id' format in the calendar popup in html code, ex- id=td_2015_6_24
   
     WebDriver driver = new FirefoxDriver();
     driver.manage().timeouts().implicitlyWait(5, TimeUnit.SECONDS);
     driver.get("http://www.yatra.com/");
   
     driver.findElement(By.id("BE_flight_depart_date")).click();
     String monthYear="";
     //this loop will execute untill your required month and year will not appear in the calendar
     //here you can also pass the input from your and by making code as common
     while(!(monthYear.equals("June 2015"))){
         driver.findElement(By.xpath("//a[@class='js_btnNext sprite nextBtn']")).click(); //this will click on next button for month
         monthYear = driver.findElement(By.xpath("//span[@class='js_monthTitle']")).getText(); // this is to get the month and year from calendar pop up
     }
   
     driver.findElement(By.xpath("//td[@id='"+futrDate+"']")).click(); //this will select the date
     }
}