function system_date_format_delete system_date_format_delete($dfid) Deletes a date format from the database. Parameters  $dfid: The date format ID. File
 modules/system/system.module, line 3960 Configuration system that lets administrators modify the workings of the site.  Code function system_date_format_delete($dfid) {
  db_delete('date_formats')
    ->condition('dfid', $dfid)
    ->execute();
}


    
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