Handle Datepicker using WebDriver simple sample

Someone asked me: "How to identify a datepicker on the webpage, which will display after clicking the datepicker icon?"
Here is a simple sample, you can customize your own function for reading your web page source and make a api for picking any dates freely :-)

//Find all the Calendar on the Web Page
List<WebElement> Datepickers = driver.findElements(By.className("CalendarIcon"));

//Trigger the calendar of StartDate
driver.manage().timeouts().implicitlyWait(5, TimeUnit.SECONDS);
Datepickers.get(0).click();


WebElement table = driver.findElement(By.className("ui-datepicker-calendar"));

List<WebElement> tds = table.findElements(By.tagName("td"));
for (WebElement td: tds){
//Select 20th Date of current month
if (td.getText().equals("20")){
td.findElement(By.linkText("20")).click();
break;
}

}

//Trigger the calendar of EndDate
driver.manage().timeouts().implicitlyWait(5, TimeUnit.SECONDS);
Datepickers.get(1).click();

WebElement table2 = driver.findElement(By.className("ui-datepicker-calendar"));

List<WebElement> tds2 = table2.findElements(By.tagName("td"));
for (WebElement td2: tds2){
//Select 22th Date of current month
if (td2.getText().equals("22")){
td2.findElement(By.linkText("22")).click();
break;
}

}