I am a very new learner and have been trying to learn as I go and I am completely stumped. I need to do the following and I cannot figure it out.

1. You have to write a function called “dateDiff” that accepts one date parameter and returns the number of days between the birthday provided and the current date.

2. Print “fname lname you have been breathing for ### days!” where ### is the number returned by your dateDiff() function. Remember to convert milliseconds to days and only return the integer(whole) number of days.

If the number of days is less than (365*18) then print “You are probably not old enough to take this class!”

Now, I have already created the following: (User id, Fname, Lname, Birthday,) as part of a login screen. Below is the code that I have written so far. Please be kind. This is my first crack at javascript.

Thank you!

HTML

<label for="birthday">Birthday:</label><br><br>
    <input class="form-control" type="date" name="datestart" value="" class="datepicker" required="" 
        placeholder="birthday" oninvalid="this.setCustomValidity('Invalid Birthday')">

JS

var d1 = new Date();
    var d2 = new Date() 

    var diff = d2.getTime() - d1.getTime();   
    var daydiff = diff / (1000 * 60 * 60 * 24);  
    document.write(" Total number of days between <b> " + d1 + " </b> and <b> " + d2 + " </b> is: <b> " + daydiff + " days </b>" );