I believe Biff's assumption is correct, why would someone use subtract if
they mean in the future,
I mean if the OP would have said subtract 3 hours from 15:00 it becomes even
more clear.
OTOH if someone says 3 hours from now it means 3 hours into the future. In
this case
I would go with Biff's assumption.
(there's no email, no snail mail, but somewhere should be gmail in my addy)
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