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Full Discussion: Need help with date arithmetic please
Top Forums Shell Programming and Scripting Need help with date arithmetic please Post 303000253 by MadeInGermany on Friday 7th of July 2017 12:15:54 PM
Old 07-07-2017
The "value too great for base" happens because there is a number with a leading zero, and bash assumes octal, and 8 is too high for an octal number.
It happens with
Code:
day=$((day+1))

or later with month.
As always there is an escape from such (mis)feature: a 10# prefix forces a base10=decimal
Code:
day=$((10#$day+1))
month=$((10#$month))

Now the leading zero are removed.

---------- Post updated at 11:15 ---------- Previous update was at 10:52 ----------

You certainly want
Code:
if [ \( $year4 -eq 0 -a \
        $year100 -ne 0 \) -o \
     $year400 -eq 0 ]
then
declare -a  max_month=(0 31 29 31 30 31 30 31 31)
fi

As Jim said, such calculations are error prone.
perl is safer because it uses the libc routines.
 

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LEARN ABOUT DEBIAN

nnstats

NNSTATS(1m)															       NNSTATS(1m)

NAME

       nnstats - display nnmaster collection and expire statistics

SYNOPSIS

       nnstats [ -lt ] [ -d month day ] [ -m month ] [ logfile ]...

DESCRIPTION

       nnstats	will  extract  the collection (C) and expiration (X) entries from the log file and calculate total and average number of articles,
       groups and elapsed time per day, per month, or for the duration of the whole log file.

       Normally only a summary for the specified period is printed.  If -l is specified, the statistics  for  each  day  in  the  period  is  also
       printed, and if -t is specified the summary is not printed.

       Normally the statistics is collected for all days in the log files (or the current log file if one is not specified).

       If  "-m	month" is specified, the statistics for that month is calculated.  The month is specified in normal date notation, i.e. a capital-
       ized three letter abbreviation like Jan, Feb, ...

       If "-d month day" is specified, the statistics for that date only is calculated and printed.

FILES

       ../Log	The log file

SEE ALSO

       nn(1), nnusage(1M), nnadmin(1M), nnmaster(8)

NOTES

       If nnmaster is run with options -LCX, nnstats will not work, because the necessary entries are not written to the log file.

AUTHORS

       Mark Moraes <moraes@csri.toronto.edu>
       Kim F. Storm <storm@texas.dk>

4th Berkeley Distribution					    Release 6.6 						       NNSTATS(1m)
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