It is not clear why you can't use C or C++ routines.  They are likely
available free.  Moreover, there are probably several different versions of
what you need available in COBOL for example.  Would that work for you?
Shell scripting would not be my first choice for this.

Charles Finley
619-795-0720
> -----Original Message-----
> From: HP-3000 Systems Discussion [mailto:[log in to unmask]] On Behalf
> Of Robert Mills
> Sent: Wednesday, March 05, 2008 7:03 AM
> To: [log in to unmask]
> Subject: Date arithmetic on Unix
> 
> Greetings to the -L,
> 
> I know that this is not an MPE question but I gather that there are
> loads of e3000 sites out there that also have 9000's and other Unix
> boxes.
> 
> I have been asked to take an existing Korn (ksh) script and remove the
> need to manually edit some dates in it (today - 1 month, today - 1 day,
> today + 1 day, today + 1 month, etc) by getting the shell to calculate
> them itself.
> 
> All the methods I have currently found required a date command which
> recognises the -d switch. Unfortunately our doesn't.
> 
> If I am unable to get the shell to do it then I'll have to write a small
> program in C or C++ which will open a can of worms with the supplier of
> the system.
> 
> Any suggestions (clean ones please) will be gratefully received.
> 
> regards,
> 
> Robert W.Mills
> Business Systems Development Analyst
> Group Information Systems & Technology
> Pinnacle Entertainment
> DDI: +44 (0)20 8309 3604
> 
> 
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