[O] Setting timestamp from end time and an interval

[Leo Gaspard]

Hello,

I find myself often working intervals “backwards”, eg. when planning
transportation: I need to be there at XX:YY, thus need to depart 35min
before.

Org-mode has this great feature that when typing `11:12+00:35` it
automatically computes the interval 11:12-11:47.

What I'm wondering is, whether there'd be interest in having
eg. `11:47+-00:35`, that'd create the same interval but from an *end*
time and interval duration.

What do you think about this? Is there already a way of doing this I
don't know of?

Cheers,
Leo