[O] bulk relative time shift (in org file)?

[Michael Gilbert]

Hi —

I've spent a fair amount of time with the manual and have hints that this might 
be possible, but I'm not piecing it together. Basically what I want to do is 
this:

- select a number of items with time stamps in an org file (either by region 
or, if I must, all items subsidiary to a headline)
- change all of their deadlines (or some other time stamp) by a set number of 
days, relative to the date they currently have
- the result is a bulk rescheduling, with the relative timing of the items 
remaining intact

Additional points:

- I would prefer to select the type of timestamp to change, but I can probably 
work with it changing all of them. (Note that some items have both Scheduled 
and Deadline timestamps. Some even have other, inactive timestamps. Plus, there 
are also timestamps in the Logbook on some items.)
- I would prefer to do this in the org file, not in the Agenda. This is a 
planning activity.
- I can see how I might do this by cloning the subtree, but that seems like an 
ugly hack, involving deleting the original.

Any guidance?

TIA!

— Michael


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