hi
if you want to add the image date in album page, you should modified zpBoostrap like that :
in inc_print_image_thumb.php, line 5 :
replace
`<a class="thumbnail" rel="tooltip" href="<?php echo html_encode(getImageLinkURL()); ?>" title="<?php echo getAnnotatedImageTitle(); ?>">`
by
`<a class="thumbnail" rel="tooltip" href="<?php echo html_encode(getImageLinkURL()); ?>" title="<?php echo getAnnotatedImageTitle().' - '.getImageDate(DATE_FORMAT); ?>">`.
as told before, you should read zenphoto documentation and read theming tutorial.