Add 10 days with selected date -on-change method -service now - datetime

Question

I have 2 date fields issued date and due date.When I choose issued date,due date should be auto populated by adding 10days with selected date. I have written on-change method for this
function onChange(control, oldValue, newValue, isLoading, isTemplate) {
if (isLoading || newValue === '') {
return;
}
//var issuedDate=new GlideDateTime(g_form.getValue('u_issued_date'))
//var issuedDate=g_form.getValue('u_issued_date')
alert(issuedDate)
var gdt = new GlideDateTime(issuedDate);
gdt.addDays(10)
g_form.setValue('u_due_date',gdt);
}
I am getting an error GlideDateTime is not defined function ().How can I achieve this? Is there any other way?

Answer 1

GlideDateTime is not available on client side. For simple operation like the one you are having you can use javascript Date object. Which is pain to format, but doable, example:
var date = new Date(g_form.getValue('u_issued_date'));
date.setDate(date.getDate() + 10); //add 10 days
g_form.setValue('u_due_date', formatDate(date));
function formatDate (date) {
return date.getFullYear() + '-' +
leadingZero(date.getMonth() + 1) + '-' +
leadingZero(date.getDate()) + ' ' +
date.getHours() + ':' +
date.getMinutes() + ':' +
date.getSeconds();
}
function leadingZero (value) {
return ("0" + value).slice(-2);
}
For more complicated operation you would wish GlideDateTime you will have to use GlideAjax, that will do operations on server side, and provide result.