Hello there!
Few things you should mind:
> Date.Parse is not a valid javascript function instead of use Date.parse and this return no. of millseconds between 1/1/1970 and to specified date.
> Javascript doesn't support dd/mm/yyyy format. So, your code might return Invalid date. So, use mm/dd/yyyy format instead of that.
var date = "02.26.2016 11:48:36"
if(!isNaN(Date.parse(date)))
{
document.write("Valid Date \n");
}