Question

Here is my code, as taken from here: Calculate age in JavaScript

        var today = new Date();
        birthday_val = $(".datepicker").val().split('/'); // input value
        birthday = new Date(birthday_val[2],birthday_val[1],birthday_val[0]); // birthday date object
        var age = today.getFullYear() - birthday.getFullYear();
        var m = today.getMonth() - birthday.getMonth();
        var d = today.getDay() - birthday.getDay();
        if (m < 0 || (m === 0 && today.getDate() < birthday.getDate()) ) {
            age--;
        }

It calculates it right except for the day – doesnt take this into account and I cant figure out why. Any takers?

Answer 1

Edit: This isn’t the correct answer, despite being marked so by the OP.

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You’re using the incorrect method to retrieve the day of the month.

Date.getDay returns the day of the week

Date.getDate returns the day of the month