create a date from string javascript code example

Example 1: how to find date in a string js

var str = 'On the 03/09/2015 I am swiming in a pool, that was build on the 27-03-1994';

var res = str.match(/\d{2}([\/.-])\d{2}\1\d{4}/g);

document.getElementById('out').value = res;

Example 2: how to validate from and to date using date.parse in javascript

var stringval = '01/03/2012';
var testdate;

try {
  testdate = $.datepicker.parseDate('mm/dd/yy', stringval);
             // Notice 'yy' indicates a 4-digit year value
} catch (e)
{
 alert(stringval + ' is not valid.  Format must be MM/DD/YYYY ' +
       'and the date value must be valid for the calendar.';
}