Age from Date of Birth using JQuery

Question

I need to calculate if someone is over 18 from their date of birth using JQuery.

var curr = new Date();
curr.setFullYear(curr.getFullYear() - 18);

var dob =         


        

Answer 1

keep in mind that all above answers work only for date using separator '/'. if you are using other that this then you have to replace that separator first.

var startDate = $('#start_date').val().replace('-','/');
var endDate = $('#end_date').val().replace('-','/');

if(startDate > endDate){
   // do stuff here...
}

happy coding :D

Answer 2

You might find the open source Datejs library to be helpful. Specifically the the addYears function.

var dob = Date.parse($(this).text());
if (dob.addYears(18) < Date.today())
{
    $(this).text("Under 18");
}
else
{
    $(this).text(" Over 18");
}

In a more terse fashion:

$(this).text(
    Date.parse($(this).text()).addYears(18) < Date.today() ?
    "Under 18" :
    " Over 18"
)

Answer 3

You could use the Date object. This will return the milliseconds between the two dates. There are 31556952000 milliseconds in a year.

function dateDiff(var now, var dob)
{
    return now.getTime() - dob.getTime();
}

Answer 4

Date.prototype.age=function(at){
    var value = new Date(this.getTime());
    var age = at.getFullYear() - value.getFullYear();
    value = value.setFullYear(at.getFullYear());
    if (at < value) --age;
    return age;
};

var dob = new Date(Date.parse($(this).text()));

if(dob.age(new Date()) < 18)
{
    $(this).text("Under 18");
}
else
{
    $(this).text(" Over 18");
}

Answer 5

You can remove the separate variable for DOB and collapse the if statement. The below code comes in at 165 characters:

var check = new Date();
check.setFullYear(check.getFullYear() - 18);
$(this).text((new Date("3/6/2009").getTime() - check.getTime() < 0)?"Under 18":"Over 18");

This will still keep the logic needed to deal with leap-years.

Answer 6

My solution.

var startDt=document.getElementById("startDateId").value;
var endDt=document.getElementById("endDateId").value;
if( (new Date(startDt).getTime() > new Date(endDt).getTime()))
{
    ----------------------------------  
}