If you look at the documentation for Linux, Open Systems POSIX, MacOS, and 
FreeBSD versions of date, you'll find the MacOS and FreeBSD are pretty much 
exact duplicates.  What differences there may be look to be just 
differences between software versions.

Linux and POSIX look to be the same "slim" version of date. While the MacOS 
version should be able to execute a POSIX compliant date command, that 
version has quite a bit of added on bells and whistles.

On Saturday, March 21, 2020 at 4:51:07 PM UTC-7, Rod Buchanan wrote:
>
>
> My guess it is from macOS' BSD heritage.  Definitely not what I'm used to 
> on our Linux boxes, or what I remember (been a while) on AIX. 
>
>
> > On Mar 21, 2020, at 4:11 PM, @lbutlr <kre...@kreme.com <javascript:>> 
> wrote: 
> > 
> > On 21 Mar 2020, at 06:24, Rod Buchanan <li...@sofstats.com <javascript:>> 
> wrote: 
> >> date -j -v -99d +"%Y%m%d0000” 
> > 
> > That’s interesting, I’ve never seen that syntax for the date command. 
> > 
> > It’s less readable, but doesn't require gdate to be installed. 
>
>

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