If you also provide duration
field with 0 value, it'll be a milestone.
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Setting the duration to 0 also sets the enddate equals startdate (or vice versa) which is exactly what I don't want. My goal is to preserve the empty date field (since it is empty for a reason in other parts of our software).
I just realized this question is probably in the wrong section of the forum since we use gantt for extjs. Feel free to move it.
This is unfortunately not supported, as our code base assumes start/end date to be set for both regular tasks and milestones.
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