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Day difference between two dates

Level 2
Level 2


my form contains a datetimefield in which a user can select any date.

Now I need to know how many days are between the entered date and the current system date.

Does anybody have an idea how the javascript can be look like?

Thanks a lot.



2 Replies
Level 10
Level 10

Hi ra_be,

Assuming your date fields are in the same format as your previous question you can use;


msPerDay = 86400000;


date1 = util.scand("", DateTimeField1.formattedValue);


date2 = util.scand("", DateTimeField2.formattedValue);


- date1.valueOf()) / msPerDay));


Level 1
Level 1

Here is some working JavaScript code from one of my forms that you might be able to adapt to your problem:

form1.#subform[0].TextFieldAge::calculate - (JavaScript, client)
// Given a Date/Time Field ("DateTimeFieldDOB") and a Text Field ("TextFieldAge")
// calculate TextFieldAge in years based on DateTimeFieldDOB and the current date
var strDateBirth = DateTimeFieldDOB.rawValue;  // Returns String in format "YYYY-MM-DD"
if ((strDateBirth != null) && (strDateBirth != ""))
   // Change date format to "YYYY/MM/DD"
   var strDateBirthSlash = strDateBirth.replace(/-/g, "/");

   // Convert string to Date object
   var dateBirth = new Date(strDateBirthSlash);
   var dateToday = new Date();  // Get the current date

   // Get difference between dates in milliseconds
   var nAgeMilliseconds = dateToday.getTime() - dateBirth.getTime();

   // Define number of milliseconds in one year
   var nMilliSecondsPerYear = 365 * 24 * 60 * 60 * 1000;

   // Get age in years (does not factor in leap years, but is close enough)
   var nAgeYears = Math.floor(nAgeMilliseconds / nMilliSecondsPerYear);

   TextFieldAge.rawValue = nAgeYears;