Re: Future date

[Stephane Chazelas]

2016-01-25 08:23:10 -0500, Greg Wooledge:
[...]
> Just to be clear, the -d 'human readable stuff' option is specific to GNU
> date, and won't work on other systems.  Also, the 'human readable stuff'
> part is NOT specified.  There is no documentation for what is allowed
> there, and what is not.  You have to figure it out by trial and error,
> and it may change between versions of GNU date.
[...]

That's a bit exaggerated. There's
https://www.gnu.org/software/coreutils/manual/html_node/Date-input-formats.html

At least it's more documented (and less buggy in my experience)
than what ksh93 accepts for its:

printf '%(%F %T %z)T\n' 'date specification'

-- 
Stephane