Google Calendar API - Updating an Events start & end date/time - php

Question

The sample/demo code for Google's API is pretty clear about updating an event title, and it seems like everyone loves copying it into their own tutorials... I can use that example to easily update the title, description, and location of an event, but I cannot use it to update the "when" attribute, which is made up of an array with start and end date/time.
The following code does not return an error but it does not update the date and time as well:
if ($eventOld = getEvent($client, $eventId)) {
//echo "Old title: " . $eventOld->title->text . "<br />\n";
$eventOld->title = $gdataCal->newTitle($title);
$eventOld->where = array($gdataCal->newWhere($where));
$eventOld->content = $gdataCal->newContent("$description");
$eventOld->when[startTime] = "{$startDate}T{$startTime}:00.000{$tzOffset}:00";
$eventOld->when[endTime] = "{$endDate}T{$endTime}:00.000{$tzOffset}:00";
print $startDate;
try
{
$eventOld->save();
}
catch (Zend_Gdata_App_Exception $e)
{
var_dump($e);
return null;
}
//return $eventNew;
}
else
{
return null;
}

Answer 1

You're submitting to the wrong var. $eventOld is previous to make changes
create a new var. Then submit your data for ex.
$eventNew = getEvent($client, $eventId)
$eventNew->when[startTime] = "{$startDate}T{$startTime}:00.000{$tzOffset}:00";
$eventNew->when[endTime] = "{$endDate}T{$endTime}:00.000{$tzOffset}:00";

Answer 2

when is an array of startTime/endTime pairs.