largecalendar Display of events spanning more than one day

Using iCal events list to display an ics feed. Having trouble with display of events that span midnight but are less than 24 hours long – e.g.
DTSTART;TZID=America/Chicago:20150109T170000
DTEND;TZID=America/Chicago:20150110T163000
This only shows on the Friday box of the large calendar view. I think it should display on the Saturday as well. I looked into this, and I believe the problem can be fixed in amr-ical-calendar.php by replacing the arm_event_is_multiday function with the following (PHP 5.3 compatible):
// —————————————————————————————-
function amr_event_is_multiday($event) { //determine if event is a multi day event

if (empty($event[‘EndDate’])) return false; // no duration at all, just a date
if (!(is_object($event[‘EventDate’]) and (is_object($event[‘EndDate’])))) return(false);

$eventDate = clone $event[‘EventDate’];
$endDate = clone $event[‘EndDate’];
// calculate the number of midnights between the start and end of the event
$eventDate->setTime(0,0,0);
$endDate->setTime(0,0,0);
$dti = $eventDate->diff($endDate); // DateInterval
$days = ($dti->days * ( $dti->invert ? -1 : 1)) +1;

if (isset($_GET[‘debugmulti’])) echo ‘
The number of days over which to show event ‘.$event[‘SUMMARY’].’ is = ‘.$days;

return $days;
}

However, counting the number of midnights exposed what I believe is an incorrect calculation of the ‘allday’ flag in amr_is_all_day(). I think an additional check is needed such that an event is only considered allday if it starts and ends at midnight. Otherwise, with an event exactly 24 hours long – e.g.
DTSTART;TZID=America/Chicago:20150116T150000
DTEND;TZID=America/Chicago:20150117T150000
the plugin modifies the EndDate to be 2015-01-16 and prevents correct display of the 2-day event. The modified amr_is_all_day function is as below:

function amr_is_all_day($d1, $d2) {
if (!(is_object($d1) and (is_object($d2)))) return(false);

if ($d1==$d2) return false; // if exact match then assume strict RC 5545 adherence, so cannot be all day, must be zero duration

// all day events must begin and end at midnight
$d1m = clone $d1;
$d2m = clone $d2;
if( $d1 != $d1m->setTime( 0,0,0) or $d2 != $d2m->setTime(0,0,0)) return false;

$dur = amr_calc_duration ( $d1, $d2); // duration could be zero if no end time or DTEND exact same as DTSTART (not all day)
if (empty ($dur[‘hours’]) and empty ($dur[‘minutes’]) and empty ($dur[‘seconds’] )) {
return true;
}
else {
return (false);
}
}

https://wordpress.org/plugins/amr-ical-events-list/