matthew sporleder wrote:
> You can also do most of this stuff portably with awk.
> Here's an easy example of yesterday: (tested on netbsd and solaris)
> 
> echo|awk 'BEGIN { d = systime() - 86400; } END { print strftime("%c", d) }'

You can do the same with "date -r $timestamp +$format" and you can calculate
using $(()) in a Bourne shell but I think he wanted to parse dates in different
formats, not just print them.

-- 
Christian