Calendar Calculator

I am in need of some sort of calendar calulator.  From within a shell script i set a variable to a date by using the date command.  I then need to be able to set another variable to a date that is 2 weeks ( 14 days) later.  I will then compare this new date to the current date to determine if this item is overdue.  I would then issue some kind of email message to the particular party.  Is there such a tool available, or is it possible all within shell scripts?
j_kAsked:
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ozoConnect With a Mentor Commented:
Ok, shall we call it an Answer then?

BTW, except for generating the "due on $date" part of the message
you might even have gotten by without using Time::Local
with something like:

($dd,$mm,$yy)=(localtime time-60*60*24*14)[3,4,5];
$old = sprintf"%d%02d%02d",$yy+1900,$mm+1,$dd;
while( <> ){
    ($ss,$mm,$dd,$yy)=split('[/|]');
    next if $old < sprintf"%d%02d%02d",$yy+1900,$mm,$dd;
    open(M,"|/usr/lib/sendmail -t") || warn $!;
    print M "To: $user\nSubject: overdue\n\nsubmittal $ss that was due 14 days after $mm/$dd/$yy is overdue\n";
    close M || warn $!;
}
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ozoCommented:
I don't understand what you want to do.
If you set a variable to the current date, and another variable to a date 14 days later, then don't you already know how they compare?

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j_kAuthor Commented:
Hello Ozo,

Sorry, The second date variable would have to be calculated from value of the 1st date variable that was contained in a text file.  Example: something like this!

The data file would look something like this:
submittal1|04/20/98|
submittal2|04/24/98|
submittal3|04/28/98|
... and so on ....

and the script would do something like this:
for each LINE in data file

SUBMITTAL=??? (awk on LINE getting 1st column)
ENTERED_DATE=04/20/98 (awk on LINE getting 2nd column)
RESPOND_DATE=???  (a calculated date 2 weeks after the entered_date)

if (today's date) is > respond_date then
  send email notifying user that the submittal $SUBMITTAL
  that was due on $RESPOND_DATE is overdue

Hope this helps
JAK


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ozoCommented:
I could suggest an answer, but I'm afraid you may have a problem with it about 600 days later...
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j_kAuthor Commented:
Thats Ok, This program may be need then.  But for now it
sure would be helpful, in the ways we are doing things now!.

Is this a good place for perl?

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ozoCommented:
Yes, using Time::Local::timelocal in perl would have been one of my suggestions.
(Setting a large time zone offset or Zeller's congruence would have been the others)

I have to go for now, but I'll try to be back later if you need more specific help.
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j_kAuthor Commented:
Yes, please expand on the perl solution.

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ozoCommented:
use Time::Local;
$now = time;
while( <> ){
        ($ss,$mm,$dd,$yy)=split('[/|]');
        $due = timelocal(0,0,6,$dd,$mm-1,$yy)+60*60*24*14;
        next if $due > $now;
        ($date=localtime($due))=~s/ \d\d:\d\d:\d\d/,/;
        open(M,"|/usr/lib/sendmail -t") || warn $!;
        print M "To: $user\nSubject: overdue\n\nsubmittal $ss that was due on $date is overdue\n";
        close M || warn $!;
}
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j_kAuthor Commented:
Thanks again, just what i needed.



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