I am using the column view on my org agendas, and I want one of the columns to show the timestamp for when the task was finilize (set to "DONE" state). I tried the following column headings
but neither of them worked. I have not found any special properties for the DONE time (althought I thought CLOSED was exactly that), so I have tried the column heading
#+COLUMNS: %TIMESTAMP_IA. However, this will show all type of inactive timestamps, not only timestamps for DONE. Another approach would be to include the timestamp for "DONE" as a property of the task, though I have no idea of how to do that.
1) how can I include a timestamp for DONE as a column in column view?
2) how to make a timestamp for DONA a property of a task?
Thanks in advance for all helpfull suggestions :)