How do I get date, month, year values from calender java script...

I want to get date from the calender in javascript using selenium webdriver. Below are the few lines to get and set date from javascript calender. Used Javascript executor with getElementById and passed specific value when you want to set. 

Let's try this out and get experience....

Code:

JavascriptExecutor js = (JavascriptExecutor) driver;

driver.findElement(By.id("purchaseDatebtn")).click();

((JavascriptExecutor)driver).executeScript("document.getElementById(\"purchaseDate\").value = \"10/07/2014\" "); 

element=driver.findElement(By.id("depositDate"))

((JavascriptExecutor)driver).executeScript("document.getElementById(\"depositDate\").value = \"10/07/2014\" ");