Hi,
It's neither a bug nor a feature. It's something we just didn't thought would be needed and thus isn't implemented.
Now looking at the code it should be quite easy to add.
Change the code:
if(preg_match('#\{date *format ?= ?(?:"|\')(.*)(?:"|\') *\}#Ui',$format,$matches)) {
$format = str_replace($matches[0],date($matches[1],$data->order_modified),$format);
}
to:
if(preg_match_all('#\{date *format ?= ?(?:"|\')(.*)(?:"|\') *\}#Ui',$format,$matches)) {
foreach($matches[0] as $k => $match) {
$format = str_replace($match,date($matches[1][$k],$data->order_modified),$format);
}
}
in the file administrator/components/com_hikashop/helpers/helper.php and that should do it.