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Figured it out, for 1 thing, had the stuff backwards, and second should have used !empty instead of isset:

 

$eventstart = $rown['starttime'];
if(!empty($eventstart)) {
     echo $rown['starttime'];
} else {
     echo "All Day";
}

normally i only use isset() for checking if a submit button has been pressed...it only really checks if the variable exists..not if it contains data

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https://forums.phpfreaks.com/topic/237264-empty-table-cell/#findComment-1219286
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