disable date in jquery datepicker after some time - php

Question

I've created a datepicker for one of my client.
They are in a flower delivery business and they offer same day delivery for order which is placed before 12 noon. so I created a following code for that. The basic overview of its functionality is:
-> Disable current date if the time is greater than 12:00 (noon) so that customer can not put order for same day delivery.
But somehow recently one order can at 6PM for same day delivery. Which is an issue.
This is what I did so far:
<?php
// This is how i check for current date and time and if the delivery cut off time is passed add that date to disabled dates array. so customer can not put order of the current date.
current_day = date( "w" );
$todays_cut_off_time = get_option("weekday_cut_off_time_$current_day");
$todays_cut_off_time = strtotime($todays_cut_off_time);
$current_time = date( 'H:i', current_time( 'timestamp', 0 ) );
$current_time = strtotime($current_time);
if($todays_cut_off_time < $current_time)
{
$disabled_dates_array[] = date("m/d/Y");
}
?>
<script>
jQuery( document ).ready(function() {
var disableddates = <?php echo $disabled_delivery_dates; ?>; //contains list of disabled dates by admin.
exceptions = <?php echo $holiday_exception_dates; ?>; //contains dates those are exceptional
function DisableSpecificDates(date) {
var m = date.getMonth() + 1;
if(m <= 9)
m = '0'+m;
var d = date.getDate();
if(d <= 9)
d = '0'+d;
var y = date.getFullYear();
// First convert the date in to the mm-dd-yyyy format
// Take note that we will increment the month count by 1
var currentdate = m + '/' + d + '/' + y ;
// We will now check if the date belongs to exceptions array
for (var i = 0; i < exceptions.length; i++) {
// Now check if the current date is in disabled dates array.
if (jQuery.inArray(currentdate, exceptions) != -1 ) {
return [true];
}
}
// We will now check if the date belongs to disableddates array
for (var i = 0; i < disableddates.length; i++) {
// Now check if the current date is in disabled dates array.
if (jQuery.inArray(currentdate, disableddates) != -1 ) {
return [false];
}
}
// In case the date is not present in disabled array, we will now check if it is a weekend.
// We will use the noWeekends function
//var weekenddate = jQuery.datepicker.noWeekends(date);
var day = date.getDay();
return [(<?php echo $disabled_week_day; ?>), ''];
}
function FindMinDate(date){
return 0;
}
jQuery( "#delivery_date" ).datepicker({
dateFormat: 'mm-dd-yy',
minDate: 0,
beforeShowDay: DisableSpecificDates
});
});
</script>
Can somebody please guide me in the right direction to get this done. Thanks in advance.