Converting Google spreadsheet date into a JS Date object?

Question

I\'ve been going round in circles on this one... I\'ve got a spreadsheet which holds two dates, and I need to find the number of elapsed years between the two (ie. someone\'

Answer 1

After some more experimenting, it turned out that it just works, which was a bit of a surprise. new Date(cell) seems to internally convert the serial number into a string which is sufficient to create the date object. Full answer:

function datedif(first, second, format) {
  var e1  = new Date(first);
  var e2  = new Date(second);
  var age = e2.getFullYear() - e1.getFullYear();
  if(
      (e2.getMonth() <  e1.getMonth()) || 
     ((e2.getMonth() == e1.getMonth()) && (e2.getDate() < e1.getDate())))
    age--;
  return age;
}