The org documentation tells us that we can use special syntax for a deadline to have a warning period:
You can specify a different lead time for warnings for a specific deadlines using the following syntax. Here is an example with a warning period of 5 days ‘DEADLINE: <2004-02-29 Sun -5d>’. This warning is deactivated if the task gets scheduled and you set org-agenda-skip-deadline-prewarning-if-scheduled to t.
This is also supported by Orgzly, where I want to use it.
I'd assume that I could call
org-deadline with this syntax but it just throws out the warning period:
(org-deadline nil "<2021-07-20 Tue -1d>")
;; => DEADLINE: <2021-07-20 Tue>
The documentation of
With two universal prefix arguments, prompt for a warning delay.
But this doesn't help me since I don't want to call interactively.
Since my entries get automatically updated by calendar sync I also have the requirement that the previous DEADLINE: entry has to get removed in this case, which is automatically handled by
I assume I could handle this with
org-remove-timestamp-with-keyword but I'm not sure which function to use for timestamp insertion if
org-deadline doesn't support the warning period syntax.
How do I insert a deadline from elisp with a warning period?