PHP & Date Format Question

[duckduckgoose]

I'd like to return the date in this format:

2006-05-09T18:00:00-08:00

I've tried using date('c'), but that doesn't appear to be working. Is there another way that I can return the current date/time in this format?

[goldlikesnow]

-08:00 what does this represent ? offset?

[Installer]

The manual appears to say that "c" was added in PHP 5.

This appears to work as a substitute:

$offset = date('O');
$offset_hr = substr($offset, 0, 3);
$offset_min = substr($offset, -2);
echo date('Y-m-d\TH:i:s' . $offset_hr . ':' . $offset_min);