dear aix gurus,
i'd like to calculate with dates (counting days between two dates). do you
have a simple -> how to...

thanx alot
tim

tim moor wrote:
> dear aix gurus,
> i'd like to calculate with dates (counting days between two dates). do you
> have a simple -> how to...
>
> thanx alot
> tim

Could you perhaps use the Julain date and work it out that way. Youd
have to be careful when crossing over the years though - you'd prob
have to do something like this for counting backwards across a year:

julian date today - julian date last year + 365

Scott

> tim moor wrote:
> > dear aix gurus,
> > i'd like to calculate with dates (counting days between two dates). do you
> > have a simple -> how to...

Not that simple I am affraid .. I use perl generally and work in epoch
seconds then convert back into a real time stamp once the calcs are
done

NB: if you keep dropping into perl from the shell it will be forky ..
so, best to write it all in perl ..

The following will be of use for you :

POSIX qw(strftime)
scalar localtime(shift)
Time::Local timelocal_nocheck

Do a google for those and you will get some examples ..

HTH
Mark Taylor

tim moor wrote:
> dear aix gurus,
> i'd like to calculate with dates (counting days between two dates). do you
> have a simple -> how to...
>

From: Matthew Landt Mon, Aug 27 2001 4:49 pm in c.u.a

#!/bin/ksh
################################################## #########################
# Date calculations using Korn shell (ksh88)
# Tapani Tarvainen July 1998, May 2000
# This code is in the public domain.
# Julian Day Number from calendar date
date2julian() # day month year
{
typeset -i day month year tmpmonth tmpyear
day=$1; month=$2; year=$3
((tmpmonth = 12 * year + month - 3))
((tmpyear = tmpmonth / 12))
print $(( (734 * tmpmonth + 15) / 24 - 2 * tmpyear + \
tmpyear/4 - tmpyear/100 + tmpyear/400 + day + 1721119 ))

}

###
# Matt's Added formatting
###

# Store input dates
date1=$1
date2=$2

# Get the dates into their respective fields. Uncomment the format of
# date input being used.

# YYYYMMDD
#year1=${date1%????}
# mmdd1=${date1#????}
# month1=${mmdd1%??}
# day1=${mmdd1#??}
#year2=${date2%????}
# mmdd2=${date2#????}
# month2=${mmdd2%??}
# day2=${mmdd2#??}

# YYYY/MM/DD or YYYY/M/D
#print $date1 |IFS=/ read year1 month1 day1
#print $date2 |IFS=/ read year2 month2 day2

# MM/DD/YY or M/D/YYYY
#print $date1 |IFS=/ read month1 day1 year1
#print $date2 |IFS=/ read month2 day2 year2

# DD/MM/YY or M/D/YYYY
print $date1 |IFS=/ read day1 month1 year1
print $date2 |IFS=/ read day2 month2 year2

# Calculate and print the difference between dates (date2 - date1)
print -- "$(($(date2julian $day2 $month2 $year2) -
$(date2julian $day1 $month1 $year1)))"


hth
Hajo

"tim moor" <tim.moor@nospam.com> writes:

> i'd like to calculate with dates (counting days between two dates). do you
> have a simple -> how to...

From http://www.unixwiz.net/tools/datemath.html

Too many times we have needed to do a bit of math on a date --
say, "today + 7 days" -- but in traditional MM/DD/YYYY format
this is really tricky (especially in a shell script). A result
of this need we built the datemath tool which can perform these
functions from the command line or from a shell script. Examples:

$ datemath today + 5
06/23/2003

$ datemath '12/25/2003 - today'
188

$ datemath today + 5 weeks
07/25/2003

when will my machine be up for one year?
$ uptime
11:09am up 317 days, 15:38, 7 users, load average: 0.16, 0.04, 0.01
$ datemath today + 365 - 317
10/24/2003


Cheers,
--
In order to understand recursion you must first understand recursion.
Remove /-nsp/ for email.

While stranded on information super highway tim moor wrote:
> dear aix gurus,
> i'd like to calculate with dates (counting days between two dates). do you
> have a simple -> how to...
>
> thanx alot
> tim
>
>

Take look at GNU date.

Here are some examples from it's documentation:

To print the date of the day before yesterday:
date --date='2 days ago'

To print the date of the day three months and one day hence:
date --date='3 months 1 day'

To print the day of year of Christmas in the current year:
date --date='25 Dec' +%j


--
Hemant Shah /"\ ASCII ribbon campaign
E-mail: NoJunkMailshah@xnet.com \ / ---------------------
X against HTML mail
TO REPLY, REMOVE NoJunkMail / \ and postings
FROM MY E-MAIL ADDRESS.
-----------------[DO NOT SEND UNSOLICITED BULK E-MAIL]------------------
I haven't lost my mind, Above opinions are mine only.
it's backed up on tape somewhere. Others can have their own.

Try here:

http://www.samag.com/documents/s=828...307b/0307b.htm

Not simple, but the worthwhile seldom are.


"tim moor" <tim.moor@nospam.com> wrote in message
news:44fd37d9$1_7@news.bluewin.ch...
> dear aix gurus,
> i'd like to calculate with dates (counting days between two dates). do you
> have a simple -> how to...
>
> thanx alot
> tim
>