Question

How can i write this correctly ?
I want to check how many days have passed from publish_end day since the publish_start day and when they are more than 30 days then a message will be display.

var a = new Date("<?php echo $this->item->publish_start; ?>");
var b = a.getDate();

var c = new Date("<?php echo $this->item->publish_end; ?>");
var d = c.getDate();

var e =  d - b ;

    if( e > 30) {
        alert("<?php echo JText::_('You cant put more than 30 days'); ?>");
                return false;
     }

Answer 1

Use the getTime() function to get the millisecond difference:

if(d.getTime() - b.getTime() > 2592000000)

(30 days have 2 592 000 000 ms)