A time field instead of end date in drupal 7 date field Is it possible to have a time field (for example in minute only) instead of end date of date field in drupal 7?

so that the user select start date and time and due time (in minute) and end datetime will be start datetime + due time?
The Date single day module for Drupal 6 worked great for this use case. There isn't a 7.x version yet, but there is an issue to port it.