Time intervals with org-read-date

[adolfo villafiorita <adolfo.villafiorita@fbk.eu>]

Hello,
I am trying to write a template to enter an entry with start and 
end time, that is, something like <2018-10-09 11:00-12:00>.

The capture template I have at the moment is:

("a" "Agenda Entry" entry (file+headline ,(concat 
(file-name-as-directory org-directory) "agenda.org") "Agenda")
         "**** %? %^G\n %^{LOCATION}p %^{ATTENDEES}p\n 
         <%(org-read-date t)>")

However, I am having problems with org-read-date.

More specifically, when using the template:

- I can correctly enter an entry with date and time.  That is, if 
  I type something like: "2018-09-10 11:00" in the modeline, the 
  timestamp generated is <2018-09-10 11:00> (as expected)

- I cannot create an entry with a time interval: the timestamp 
  returned by org-read-date has the current time instead of the 
  interval entered in the modeline.  That is, if I type in the 
  modeline something like "2018-09-10 11:00-12:00", the timestamp 
  generated is <2018-09-10 14:14>, assuming 14:14 is the current 
  time.

This seems odd, since the date printed right of => in the modeline 
seems to recognize the interval correctly.

Is this the intended behavior of org-read-date?

... and, more to the point, any suggestion on how to fix the 
template?

    thanks in advance!
    -adolfo


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