Hi Bastien,

I attached the two patches:

  - 0001: Use `org-time-string-to-time' to convert timestamps to time objects

  - 0002: Allow inactive timestamps

I am currently pondering whether or not it could be useful to limit
the creation of the created timestamp to todo headlines only. At least
for me a created timestamp does not make sense for a headline that is,
say, part of a document's outline.

Regards

 -- David

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