how can i get the calendar selected values?

How can i get calendar selected values in php file? i am using calendar from this link http://www.kelvinluck.com/assets/jquery/datePicker/v2/demo/da开发者_Go百科tePickerMultiple.html

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by $var = $_POST["formElementName"]. The date set in the inputfield can be retreived by $_POST, at least, if you use POST as your form-method.

(The selected date gets binded to a DOM-element).