Zend Date next day by name - not great but it works...

Date.php

<?php 
class Application_Date
    extends Zend_Date
{
    public static function nextDay($dayWanted)
    {
        $weekdays = array('sunday', 'monday', 'tuesday', 'wednesday', 'thursday', 'friday', 'saturday');
        if (!in_array($dayWanted, $weekdays)) {
            throw new Zend_Exception("'{$dayWanted}' not found in array of possible weekdays");
        }
        $weekdays = array_flip($weekdays);
        $date = Zend_Date::now();
        $today = $date->get(Zend_Date::WEEKDAY_DIGIT);
        $daysToAdd = ( $weekdays[$dayWanted] - $today + 7 ) % 7;
        if ($daysToAdd == 0) {
            $daysToAdd = 7;
        }
        $date->addDay($daysToAdd);
        return $date;
    }
}