date_format_date() will not use custom date format

Hey all,

I ran into this yesterday when theming a cck date field.

I can make date_format_date() work with long, medium, or short, but not mycustomformat.

I notice that mycustomformat is in the database table date_format_types, and the only difference between it and the other, default types, is that locked is set to 0.

Cleared cache, etc.

To replicate, create a custom format with a custom display format (why are these both called 'formats'? This should be changed). Create a field that uses another format for display. Now, attempt to use the custom display format in the following programmatic way:

  $date_raw = $field_date[0]['value']; //Get datestamp from cck field, could use $node->whatever
  $date_object = date_make_date($date_raw); //Format_date wants a date object, so create one
  $formatted_date = date_format_date($date_object,'mycustomtype'); 
  print $formatted_date;