Re: Command-line-interface (CLI) calculator to work out the difference between 2 dates

[Ron Johnson <ron.l.johnson@cox.net>]

On 08/24/08 12:41, Damon L. Chesser wrote:
> On Sun, 2008-08-24 at 11:25 -0500, Ron Johnson wrote:
> > On 08/24/08 10:54, Edward J. Shornock wrote:
> > [snip]
> > > While I'm sure someone else will provide a much better way, I've used 
> > > something like
> > >
> > > $ echo $(date  -d 20080824 +%j) - $(date  -d 20080724 +%j) | bc
> > > 31
> > That a good idea.  I never knew date(1) could do that.  The problem, 
> > though, is that it doesn't span years.
> >
> > $ echo $(date -d 20090824 +%j) - $(date -d 20080724 +%j) | bc
> > 30
> >
> > Use delta from epoch, instead.
> > $ echo $[$(date -d 20090824 +%s) - $(date -d 20080724 +%s)]/86400|bc
> > 396
>
> Why the "/86400"?  I follow all of the above but that operation and number.

60 seconds * 60 minutes * 24 hours = 86400 seconds
   -------      -------      -----         -------
   minute       hour         day           day

--
Ron Johnson, Jr.
Jefferson LA  USA

"Do not bite at the bait of pleasure till you know there is no
hook beneath it."  -- Thomas Jefferson