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Top Forums Shell Programming and Scripting Shell Script to Loop through Quarter dates Post 303002590 by durden_tyler on Monday 28th of August 2017 11:15:28 AM
Old 08-28-2017
Thank you for testing it for various inputs and posting the Perl version.
I could not find a working Perl 5.10 version to test it, so am unable to reproduce the bug.
However, after searching on the Internet, it looks like "add_months()" method has a few quirks while working with dates close to the ends of a month.
My best guess is that this line is the culprit:

Code:
 31    my $prev_yr_dt = $date->add_months(-12);

When you subtract 12 months from "20180105", I think it goes back to some day in December, 2016 instead of "20170105".
Thereafter, it goes takes the year "2016", pads "0701" and arrives at "20160701" as the start fiscal year.
If you print $prev_yr_dt, you should be able to see what date exactly it goes to.

For months 1 through 6 of any year, we only have to jump back a bit enough to reach the previous year. So, instead of 12 a safe jump could be 9.
Change the line # 31 from this:

Code:
 31    my $prev_yr_dt = $date->add_months(-12);

to this:

Code:
 31    my $prev_yr_dt = $date->add_months(-9);

That should fix the problem.

A more robust solution would be to extract the year for all dates in months 1 through 6.
Subtract one from the year to get to the previous year.
Then pad month "07" and day "01" to arrive at the start of fiscal year.
That way, the "add_months()" method is avoided altogether.
This User Gave Thanks to durden_tyler For This Post:
 

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XCALPR(1)						      General Commands Manual							 XCALPR(1)

NAME
xcalpr - print xcal calendar entries SYNTAX
xcalpr [ -c ][ -x ][ -f file ][ -d dir ][ -u user ][ date-spec ] DESCRIPTION
Xcalpr prints the contents of the xcal files. It is intended to be used in situations when you have no access to an X screen. It can also be used to generate entries for the standard UNIX calendar program. With no arguments, it prints any entries that exist for the next seven days. The program also reads the contents of the seven daily files and prints them at the appropriate point in the output stream. Each line in the output is preceded by the day of the week, the day of the month, the month and the year. Xcalpr can be given a date specification to select months and years. If the date spec consists of just a year number, then all the data for that year is printed. For example: xcalpr 1994 will print all the data for 1994. Several years can be specified. If you give the name of a month, then the data for that month in the current year will be printed. If the month is in the past, then the data for that month next year will be printed. For example, if xcalpr oct jan is typed in August, xcalpr will print October in the current year and January next year. You can select a particular year by adding the number after any months that you need printing: xcalpr oct nov 1994 will print October and November in 1994. There are a couple of special `month' names. The name rest will print the data for the rest of the month, starting tomorrow. The rest argument is not recognised if you give a year as a parameter. If tomorrow happens to be the first day of the next month, then all the data for next month will be printed. The name next prints all the data for next month. OPTIONS
The -c option causes xcalpr to output lines suitable for input to the standard UNIX calendar program. The -d switch is followed by a directory name and specifies an alterative location for your Calendar directory. Your home directory is prepended if the name doesn't start with a slash or a dot. The -f option is followed by a file name and xcalpr will write it's output to that file, rather than standard output. The -u option is followed by a user name and dumps their calendar files rather than yours. The -x option makes xcalev operate with Calendar files that are compatible with the xcalendar program. FILES
$HOME/Calendar/* xc<dd><Mon><Year> A data file is day, Month in three letter format and the year. xy<Year> A year directory. xw<Day> A data file for the weekly code, one per day. SEE ALSO
xcal(1), xcalev(1), xcal_cal(1) AUTHOR
Copyright 1993 by Peter Collinson, Hillside Systems All rights reserved. This product includes software developed by the University of California, Berkeley and its contributors. X Version 11 R5 October 1993 XCALPR(1)
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