Calculating difference between two dates in javascript

Hi there,

I'm having some problems with calculating the difference between two dates.

This following function can work on two dates within the same month but it doesn't work on two dates on different months:-

firstDate = new Date(year1, month1, day1);
secondDate = new Date(year2, month2, day2);

msPerDay = 24 * 60 * 60 * 1000
dbd = Math.floor((secondDate-firstDate)/ msPerDay) + 1;

Pls help... I have been thinking of solutions to solve that frustrating problem for some months already. ~:p

Thanks so very much if you can help!

[edit: moved by notepad]

Try converting each date into the number of seconds since an arbitrary starting point (they usually use Jan 1, 1970), subtracting the larger number (more recent date) from the smaller number) and then convert that into whatever time quantity you need.

Hi filefrog,

thanks fr helping and i have solved the problem already.

cool. how didja do it (just curious, and also in case anyone else is facing the same 'problem') ?

Hi FileFrog,

Here's the solution that i have managed to figured out:

var day1, day2;
var month1, month2;
var year1, year2;

value1 = form.datebox.value;
value2 = form.datebox2.value;

day1 = value1.substring (0, value1.indexOf ("/"));
month1 = value1.substring (value1.indexOf ("/")+1, value1.lastIndexOf ("/"));
year1 = value1.substring (value1.lastIndexOf ("/")+1, value1.length);

day2 = value2.substring (0, value2.indexOf ("/"));
month2 = value2.substring (value2.indexOf ("/")+1, value2.lastIndexOf ("/"));
year2 = value2.substring (value2.lastIndexOf ("/")+1, value2.length);

date1 = year1+"/"+month1+"/"+day1;
date2 = year2+"/"+month2+"/"+day2;

firstDate = Date.parse(date1)
secondDate= Date.parse(date2)

msPerDay = 24 * 60 * 60 * 1000
dbd = Math.round((secondDate.valueOf()-firstDate.valueOf())/ msPerDay) + 1;

Hope this helps!!

Sorry i was busy that didn't notice your next question.. :p