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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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holidays(4)							   File Formats 						       holidays(4)

NAME
holidays - prime/nonprime table for the accounting system SYNOPSIS
/etc/acct/holidays DESCRIPTION
The /etc/acct/holidays file specifies prime time hours and holidays. Holidays and weekends are considered non-prime time hours. /etc/acct/holidays is used by the accounting system. All lines beginning with an * are comments. The /etc/acct/holidays file consists of two sections. The first non-comment line defines the current year and the start time of prime and non-prime time hours, in the form of: current_year prime_start non_prime_start Specify prime_start and non_prime_start times in the range of 0000 to 2400. The remaining non-comment lines define the holidays in the form of: month/day company_holiday Of these two fields, only the month/day is actually used by the accounting system programs. The /etc/acct/holidays file must be updated every year. EXAMPLES
Example 1 An Example of the /etc/acct/holidays File The following is an example of the /etc/acct/holidays file: * Prime/Nonprime Table for the accounting system * * Curr Prime Non-Prime * Year Start Start * 1991 0830 1800 * * only the first column (month/day) is significant. * * month/day Company Holiday * 1/1 New Years Day 5/30 Memorial Day 7/4 Indep. Day 9/5 Labor Day 11/24 Thanksgiving Day 11/25 day after Thanksgiving 12/25 Christmas 12/26 day after Christmas SEE ALSO
acct(1M) SunOS 5.11 18 Aug 2008 holidays(4)
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