JQuery DatePicker

How to handle date picker issues. My code is not working every time I execute it.

Attached file is the date picker which I am working on. I have to change the year and month and then select a date.

//Select Date in date picker

//Click to the placeholder(input box) first after which the date picker will displayed
WebElement date=driver.findElement(By.id("CommonHeaderContentPlaceHolder_txttimedate"));
date.click();

//select year from date picker
Select year=new Select(driver.findElement(By.xpath(".//*[@id='ui-datepicker-div']/div/div/select[2]")));
year.selectByVisibleText("2013");   //the date picker bydefault takes current year(2015), i need to change it to 2013.

Thread.sleep(500);

WebElement selectDate=driver.findElement(By.xpath(".//*[@id='ui-datepicker-div']/table/tbody/tr/td/a[text()='16']"));
selectDate.click();
Thread.sleep(500);

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