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Shell Script to Loop through Quarter dates


 
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# 8  
Old 08-24-2017
Here's my attempt in Perl, in case Perl is an option for you.
The following program accepts a date in "yyyymmdd" format and returns the start/end date pairs for the previous quarters and month as per your post.
If no date is passed, it uses today's date.
Only the core modules are used, so no additional module from CPAN is required.
However, these core modules - Time::Piece and Time::Seconds are available from Perl version 5.8 onwards, so that's the minimum version required.

Code:
$ 
$ cat -n get_quarter_dates.pl 
     1    #!/usr/bin/perl -w
     2    # ====================================================================
     3    # Usage: perl get_quarter_dates.pl 20170705
     4    #        perl get_quarter_dates.pl
     5    # Desc : If a date is passed in "YYYYMMDD" format, then it is used.
     6    #        Otherwise, current date is used.
     7    # ====================================================================
     8    use strict;
     9    use Time::Piece;
    10    use Time::Seconds;
    11    
    12    my $date;
    13    my $start_fiscal_yr;
    14    # Fiscal year starts from July. If that changes, change the next line.
    15    my $start_fiscal_month = "07";
    16    
    17    # Use either the date passed or today's date as the working date.
    18    if ($#ARGV >= 0) {
    19        $date = Time::Piece->strptime($ARGV[0], "%Y%m%d");
    20    } else {
    21        $date = Time::Piece->new;
    22    }
    23    
    24    # Determine the start of fiscal year
    25    if ($date->mon > $start_fiscal_month) {
    26        # Go to the fiscal month of current year
    27        $start_fiscal_yr = Time::Piece->strptime($date->year.$start_fiscal_month."01", "%Y%m%d");
    28    } else {
    29        # Go back 12 months to the previous year.
    30        # Then set the fiscal month of previous year as start of fiscal year.
    31        my $prev_yr_dt = $date->add_months(-12);
    32        $start_fiscal_yr = Time::Piece->strptime($prev_yr_dt->year.$start_fiscal_month."01", "%Y%m%d");
    33    }
    34    
    35    # Set up the quarter start/end dates and then loop through the quarters.
    36    my $qtr_start_date = $start_fiscal_yr;
    37    my $qtr_end_date = $start_fiscal_yr->add_months(3) - ONE_DAY;
    38    foreach my $i (1..4) {
    39        # If quarter end is later than working date then determine previous month end
    40        # and print the interval (qtr_start, prev_mth_end) only if qtr_start is earlier
    41        # than previous month end.
    42        if ($qtr_end_date >= $date) {
    43            my $curr_mth_start_date = Time::Piece->strptime($date->strftime("%Y-%m-01"), "%Y-%m-%d");
    44            my $prev_mth_end_date = $curr_mth_start_date - ONE_DAY;
    45            if ($qtr_start_date < $prev_mth_end_date){
    46                printf("%s %s\n", $qtr_start_date->ymd, $prev_mth_end_date->ymd);
    47            }
    48            last;
    49        }
    50        printf("%s %s\n", $qtr_start_date->ymd, $qtr_end_date->ymd);
    51        # Move on to the next quarter.
    52        $qtr_start_date = $qtr_end_date + ONE_DAY;
    53        $qtr_end_date = $qtr_start_date->add_months(3) - ONE_DAY;
    54    }
    55    
$ 
$

A few test runs:

Code:
$ 
$ # No date passed; uses today's date.
$ perl get_quarter_dates.pl
2017-07-01 2017-07-31
$ 
$ # For July 2017, generate the start/end dates of 4 quarters of previous fiscal year
$ perl get_quarter_dates.pl 20170705
2016-07-01 2016-09-30
2016-10-01 2016-12-31
2017-01-01 2017-03-31
2017-04-01 2017-06-30
$ 
$ perl get_quarter_dates.pl 20170805
2017-07-01 2017-07-31
$ 
$ perl get_quarter_dates.pl 20170905
2017-07-01 2017-08-31
$ 
$ perl get_quarter_dates.pl 20171005
2017-07-01 2017-09-30
$ 
$ perl get_quarter_dates.pl 20171105
2017-07-01 2017-09-30
2017-10-01 2017-10-31
$ 
$ perl get_quarter_dates.pl 20171205
2017-07-01 2017-09-30
2017-10-01 2017-11-30
$ 
$ perl get_quarter_dates.pl 20180105
2017-07-01 2017-09-30
2017-10-01 2017-12-31
$ 
$ perl get_quarter_dates.pl 20180205
2017-07-01 2017-09-30
2017-10-01 2017-12-31
2018-01-01 2018-01-31
$ 
$ perl get_quarter_dates.pl 20180305
2017-07-01 2017-09-30
2017-10-01 2017-12-31
2018-01-01 2018-02-28
$ 
$ perl get_quarter_dates.pl 20180405
2017-07-01 2017-09-30
2017-10-01 2017-12-31
2018-01-01 2018-03-31
$ 
$ perl get_quarter_dates.pl 20180505
2017-07-01 2017-09-30
2017-10-01 2017-12-31
2018-01-01 2018-03-31
2018-04-01 2018-04-30
$ 
$ perl get_quarter_dates.pl 20180605
2017-07-01 2017-09-30
2017-10-01 2017-12-31
2018-01-01 2018-03-31
2018-04-01 2018-05-31
$ 
$ # And back to the same logic for July of next year
$ perl get_quarter_dates.pl 20180705
2017-07-01 2017-09-30
2017-10-01 2017-12-31
2018-01-01 2018-03-31
2018-04-01 2018-06-30
$ 
$

The start of the fiscal month is set as "07" (July) at line # 15, but it can be changed.
I changed the start of fiscal month to "10" (October) below:

Code:
$ 
$ cat -n get_quarter_dates.pl | sed -n 1,16p
     1    #!/usr/bin/perl -w
     2    # ====================================================================
     3    # Usage: perl get_quarter_dates.pl 20170705
     4    #        perl get_quarter_dates.pl
     5    # Desc : If a date is passed in "YYYYMMDD" format, then it is used.
     6    #        Otherwise, current date is used.
     7    # ====================================================================
     8    use strict;
     9    use Time::Piece;
    10    use Time::Seconds;
    11    
    12    my $date;
    13    my $start_fiscal_yr;
    14    # Fiscal year starts from July. If that changes, change the next line.
    15    my $start_fiscal_month = "10";
    16    
$ 
$

And the script works accordingly:

Code:
$ 
$ perl get_quarter_dates.pl 20171005
2016-10-01 2016-12-31
2017-01-01 2017-03-31
2017-04-01 2017-06-30
2017-07-01 2017-09-30
$ 
$ perl get_quarter_dates.pl 20171105
2017-10-01 2017-10-31
$ 
$ perl get_quarter_dates.pl 20171205
2017-10-01 2017-11-30
$ 
$ perl get_quarter_dates.pl 20180105
2017-10-01 2017-12-31
$ 
$ perl get_quarter_dates.pl 20180205
2017-10-01 2017-12-31
2018-01-01 2018-01-31
$ 
$ perl get_quarter_dates.pl 20180905
2017-10-01 2017-12-31
2018-01-01 2018-03-31
2018-04-01 2018-06-30
2018-07-01 2018-08-31
$ 
$

Thereafter, incorporating this script in a shell script should be easy.
I assume you are connecting to PostgreSQL via the "psql" command-line utility.
If so, the Bash shell script looks like this:

Code:
$ 
$ cat -n fetch_pg_data.sh 
     1    #!/bin/bash
     2    # ========================================================================================
     3    # If a date in "YYYYMMDD" format is passed to this shell script, it will be fed to
     4    # the Perl program "get_quarter_dates.pl". The output from the Perl program is
     5    # passed to the PostgreSQL client "psql". The output file is named uniquely according
     6    # to the start and end dates.
     7    # ========================================================================================
     8    perl get_quarter_dates.pl $1 |
     9    while read dt_start dt_end
    10    do
    11        outfile="data_${dt_start}_${dt_end}.log"
    12        echo "Start Date : $dt_start"
    13        echo "End Date   : $dt_end"
    14        echo "Spool file : $outfile"
    15        echo "================================="
    16        psql -d mydb -o $outfile -c "select sum(values) from t_data where dt between '$dt_start' and '$dt_end'"
    17    done
    18    
$ 
$

If the script has to be run for some previous date, it can be passed to the shell script.
The shell script, in turn, passes it on to Perl.
The "outfile" name is based on the start/end dates.

Execution of the shell script:

Code:
$ 
$ . fetch_pg_data.sh 20170705
Start Date : 2016-07-01
End Date   : 2016-09-30
Spool file : data_2016-07-01_2016-09-30.log
=================================
Start Date : 2016-10-01
End Date   : 2016-12-31
Spool file : data_2016-10-01_2016-12-31.log
=================================
Start Date : 2017-01-01
End Date   : 2017-03-31
Spool file : data_2017-01-01_2017-03-31.log
=================================
Start Date : 2017-04-01
End Date   : 2017-06-30
Spool file : data_2017-04-01_2017-06-30.log
=================================
$ 
$ 
$ cat data_2016-07-01_2016-09-30.log
       sum        
------------------
 50.4268608423881
(1 row)

$ 
$ cat data_2016-10-01_2016-12-31.log
       sum        
------------------
 51.2326508448459
(1 row)

$ 
$ cat data_2017-01-01_2017-03-31.log
       sum        
------------------
 47.1403563958593
(1 row)

$ 
$ cat data_2017-04-01_2017-06-30.log
       sum        
------------------
 44.4815620388836
(1 row)

$ 
$

# 9  
Old 08-25-2017
Thanks Tyler!. This was Awesome and complete script. But One issue I was facing, see below input for 20180105

Code:
perl get_quarter_dates.pl 20180105
2016-07-01 2016-09-30
2016-10-01 2016-12-31
2017-01-01 2017-03-31
2017-04-01 2017-06-30

perl get_quarter_dates.pl 20180205
2017-07-01 2017-09-30
2017-10-01 2017-12-31
2018-01-01 2018-01-31

Quote:
Originally Posted by durden_tyler
Here's my attempt in Perl, in case Perl is an option for you.
The following program accepts a date in "yyyymmdd" format and returns the start/end date pairs for the previous quarters and month as per your post.
If no date is passed, it uses today's date.
Only the core modules are used, so no additional module from CPAN is required.
However, these core modules - Time::Piece and Time::Seconds are available from Perl version 5.8 onwards, so that's the minimum version required.

Code:
$ 
$ cat -n get_quarter_dates.pl 
x
$ 
$

A few test runs:

Code:
$ 
$ # No date passed; uses today's date.
$ perl get_quarter_dates.pl
2017-07-01 2017-07-31
$ 
$ # For July 2017, generate the start/end dates of 4 quarters of previous fiscal year
$ perl get_quarter_dates.pl 20170705
2016-07-01 2016-09-30
2016-10-01 2016-12-31
2017-01-01 2017-03-31
2017-04-01 2017-06-30
$ 
$ perl get_quarter_dates.pl 20170805
2017-07-01 2017-07-31
$ 
$ perl get_quarter_dates.pl 20170905
2017-07-01 2017-08-31
$ 
$ perl get_quarter_dates.pl 20171005
2017-07-01 2017-09-30
$ 
$ perl get_quarter_dates.pl 20171105
2017-07-01 2017-09-30
2017-10-01 2017-10-31
$ 
$ perl get_quarter_dates.pl 20171205
2017-07-01 2017-09-30
2017-10-01 2017-11-30
$ 
$ perl get_quarter_dates.pl 20180105
2017-07-01 2017-09-30
2017-10-01 2017-12-31
$ 
$ perl get_quarter_dates.pl 20180205
2017-07-01 2017-09-30
2017-10-01 2017-12-31
2018-01-01 2018-01-31
$ 
$ perl get_quarter_dates.pl 20180305
2017-07-01 2017-09-30
2017-10-01 2017-12-31
2018-01-01 2018-02-28
$ 
$ perl get_quarter_dates.pl 20180405
2017-07-01 2017-09-30
2017-10-01 2017-12-31
2018-01-01 2018-03-31
$ 
$ perl get_quarter_dates.pl 20180505
2017-07-01 2017-09-30
2017-10-01 2017-12-31
2018-01-01 2018-03-31
2018-04-01 2018-04-30
$ 
$ perl get_quarter_dates.pl 20180605
2017-07-01 2017-09-30
2017-10-01 2017-12-31
2018-01-01 2018-03-31
2018-04-01 2018-05-31
$ 
$ # And back to the same logic for July of next year
$ perl get_quarter_dates.pl 20180705
2017-07-01 2017-09-30
2017-10-01 2017-12-31
2018-01-01 2018-03-31
2018-04-01 2018-06-30
$ 
$

The start of the fiscal month is set as "07" (July) at line # 15, but it can be changed.
I changed the start of fiscal month to "10" (October) below:

Code:
$ 
$ cat -n get_quarter_dates.pl | sed -n 1,16p
     1    #!/usr/bin/perl -w
     2    # ====================================================================
     3    # Usage: perl get_quarter_dates.pl 20170705
     4    #        perl get_quarter_dates.pl
     5    # Desc : If a date is passed in "YYYYMMDD" format, then it is used.
     6    #        Otherwise, current date is used.
     7    # ====================================================================
     8    use strict;
     9    use Time::Piece;
    10    use Time::Seconds;
    11    
    12    my $date;
    13    my $start_fiscal_yr;
    14    # Fiscal year starts from July. If that changes, change the next line.
    15    my $start_fiscal_month = "10";
    16    
$ 
$

And the script works accordingly:

Code:
$ 
$ perl get_quarter_dates.pl 20171005
2016-10-01 2016-12-31
2017-01-01 2017-03-31
2017-04-01 2017-06-30
2017-07-01 2017-09-30
$ 
$ perl get_quarter_dates.pl 20171105
2017-10-01 2017-10-31
$ 
$ perl get_quarter_dates.pl 20171205
2017-10-01 2017-11-30
$ 
$ perl get_quarter_dates.pl 20180105
2017-10-01 2017-12-31
$ 
$ perl get_quarter_dates.pl 20180205
2017-10-01 2017-12-31
2018-01-01 2018-01-31
$ 
$ perl get_quarter_dates.pl 20180905
2017-10-01 2017-12-31
2018-01-01 2018-03-31
2018-04-01 2018-06-30
2018-07-01 2018-08-31
$ 
$

Thereafter, incorporating this script in a shell script should be easy.
I assume you are connecting to PostgreSQL via the "psql" command-line utility.
If so, the Bash shell script looks like this:

Code:
$ 
$ cat -n fetch_pg_data.sh 
     1    #!/bin/bash
     2    # ========================================================================================
     3    # If a date in "YYYYMMDD" format is passed to this shell script, it will be fed to
     4    # the Perl program "get_quarter_dates.pl". The output from the Perl program is
     5    # passed to the PostgreSQL client "psql". The output file is named uniquely according
     6    # to the start and end dates.
     7    # ========================================================================================
     8    perl get_quarter_dates.pl $1 |
     9    while read dt_start dt_end
    10    do
    11        outfile="data_${dt_start}_${dt_end}.log"
    12        echo "Start Date : $dt_start"
    13        echo "End Date   : $dt_end"
    14        echo "Spool file : $outfile"
    15        echo "================================="
    16        psql -d mydb -o $outfile -c "select sum(values) from t_data where dt between '$dt_start' and '$dt_end'"
    17    done
    18    
$ 
$

If the script has to be run for some previous date, it can be passed to the shell script.
The shell script, in turn, passes it on to Perl.
The "outfile" name is based on the start/end dates.

Execution of the shell script:

Code:
$ 
$ . fetch_pg_data.sh 20170705
Start Date : 2016-07-01
End Date   : 2016-09-30
Spool file : data_2016-07-01_2016-09-30.log
=================================
Start Date : 2016-10-01
End Date   : 2016-12-31
Spool file : data_2016-10-01_2016-12-31.log
=================================
Start Date : 2017-01-01
End Date   : 2017-03-31
Spool file : data_2017-01-01_2017-03-31.log
=================================
Start Date : 2017-04-01
End Date   : 2017-06-30
Spool file : data_2017-04-01_2017-06-30.log
=================================
$ 
$ 
$ cat data_2016-07-01_2016-09-30.log
       sum        
------------------
 50.4268608423881
(1 row)

$ 
$ cat data_2016-10-01_2016-12-31.log
       sum        
------------------
 51.2326508448459
(1 row)

$ 
$ cat data_2017-01-01_2017-03-31.log
       sum        
------------------
 47.1403563958593
(1 row)

$ 
$ cat data_2017-04-01_2017-06-30.log
       sum        
------------------
 44.4815620388836
(1 row)

$ 
$

# 10  
Old 08-25-2017
Quote:
Originally Posted by krux_rap
...
...
But One issue I was facing, see below input for 20180105
Code:
perl get_quarter_dates.pl 20180105
2016-07-01 2016-09-30
2016-10-01 2016-12-31
2017-01-01 2017-03-31
2017-04-01 2017-06-30

perl get_quarter_dates.pl 20180205
2017-07-01 2017-09-30
2017-10-01 2017-12-31
2018-01-01 2018-01-31

Hmm... the output of 20180205 is correct, but the output for 20180105 looks like the one you should've seen for 20170705.
Can't figure out, without further information, why it would work incorrectly for just one value.
The code extracts the month from 20180105 and since that is less than 7, it would:
- go back 1 year to 20170105
- extract the year from it, to get 2017
- add the fiscal month "07" and date "01" to the year, to get 20170701 (start fiscal yr)
- and then jump quarters from start fiscal year. so it should return, for 20180105:

Code:
$ 
$ perl get_quarter_dates.pl 20180105
2017-07-01 2017-09-30
2017-10-01 2017-12-31
$

A few questions to get more information:

1) Could you check again if that output is really for 20180105 and not 20170705 ?
2) What output do you get for 20170705 ?
3) Are there any other dates, besides 20180105, for which the output is incorrect ?
4) Could you run the program for all the dates I ran it, in my post ?
5) Did you make any changes in the Perl program I posted ?
6) What is your Perl version ? The following command shows the version:

Code:
perl -v

I tested it on my system that has Perl 5.24 on Debian 9.

Code:
$ 
$ perl -v

This is perl 5, version 24, subversion 1 (v5.24.1) built for x86_64-linux-gnu-thread-multi
(with 73 registered patches, see perl -V for more detail)

Copyright 1987-2017, Larry Wall

Perl may be copied only under the terms of either the Artistic License or the
GNU General Public License, which may be found in the Perl 5 source kit.

Complete documentation for Perl, including FAQ lists, should be found on
this system using "man perl" or "perldoc perl".  If you have access to the
Internet, point your browser at http://www.perl.org/, the Perl Home Page.

$ 
$ uname -morsv
Linux 4.9.0-3-amd64 #1 SMP Debian 4.9.30-2+deb9u3 (2017-08-06) x86_64 GNU/Linux
$ 
$ cat /etc/debian_version
9.1
$ 
$

7) What are the versions of your Perl modules Time::Piece and Time::Seconds ? The following commands show the version:

Code:
perl -MTime::Piece -le 'print $Time::Piece::VERSION'
perl -MTime::Seconds -le 'print $Time::Seconds::VERSION'

I have version 1.31 for both these modules.

Code:
$ 
$ perl -MTime::Piece -le 'print $Time::Piece::VERSION'
1.31
$ 
$ perl -MTime::Seconds -le 'print $Time::Seconds::VERSION'
1.31
$

# 11  
Old 08-27-2017
A few questions to get more information:

1) Could you check again if that output is really for 20180105 and not 20170705 ?
Code:
Yes I still see same output for both inputs

$ perl get_quarter_dates.pl 20180105
2016-07-01 2016-09-30
2016-10-01 2016-12-31
2017-01-01 2017-03-31
2017-04-01 2017-06-30

2) What output do you get for 20170705 ?
Code:
$ perl get_quarter_dates.pl 20170705
2016-07-01 2016-09-30
2016-10-01 2016-12-31
2017-01-01 2017-03-31
2017-04-01 2017-06-30

3) Are there any other dates, besides 20180105, for which the output is incorrect ?
Tried all months except for Jan remaining all looks perfect

4) Could you run the program for all the dates I ran it, in my post?
Code:
$ perl get_quarter_dates.pl 20170705
2016-07-01 2016-09-30
2016-10-01 2016-12-31
2017-01-01 2017-03-31
2017-04-01 2017-06-30
$ perl get_quarter_dates.pl 20170805
2017-07-01 2017-07-31
$ perl get_quarter_dates.pl 20170905
2017-07-01 2017-08-31
$ perl get_quarter_dates.pl 20171005
2017-07-01 2017-09-30
$ perl get_quarter_dates.pl 20171105
2017-07-01 2017-09-30
2017-10-01 2017-10-31
$ perl get_quarter_dates.pl 20171205
2017-07-01 2017-09-30
2017-10-01 2017-11-30
$ perl get_quarter_dates.pl 20180105
2016-07-01 2016-09-30
2016-10-01 2016-12-31
2017-01-01 2017-03-31
2017-04-01 2017-06-30
$ perl get_quarter_dates.pl 20180205
2017-07-01 2017-09-30
2017-10-01 2017-12-31
2018-01-01 2018-01-31
$ perl get_quarter_dates.pl 20180305
2017-07-01 2017-09-30
2017-10-01 2017-12-31
2018-01-01 2018-02-28
$ perl get_quarter_dates.pl 20180405
2017-07-01 2017-09-30
2017-10-01 2017-12-31
2018-01-01 2018-03-31
$ perl get_quarter_dates.pl 20180505
2017-07-01 2017-09-30
2017-10-01 2017-12-31
2018-01-01 2018-03-31
2018-04-01 2018-04-30
$ perl get_quarter_dates.pl 20180605
2017-07-01 2017-09-30
2017-10-01 2017-12-31
2018-01-01 2018-03-31
2018-04-01 2018-05-31
$ perl get_quarter_dates.pl 20180705
2017-07-01 2017-09-30
2017-10-01 2017-12-31
2018-01-01 2018-03-31
2018-04-01 2018-06-30
$ perl get_quarter_dates.pl 20180805
2018-07-01 2018-07-31
$ perl get_quarter_dates.pl 20190105
2017-07-01 2017-09-30
2017-10-01 2017-12-31
2018-01-01 2018-03-31
2018-04-01 2018-06-30

5) Did you make any changes in the Perl program I posted ?

Nope, Just copied as it is

6) What is your Perl version? The following command shows the version:

Code:
perl -v

This is perl, v5.10.1 (*) built for x86_64-linux-thread-multi

Copyright 1987-2009, Larry Wall

Perl may be copied only under the terms of either the Artistic License or the
GNU General Public License, which may be found in the Perl 5 source kit.

Complete documentation for Perl, including FAQ lists, should be found on
this system using "man perl" or "perldoc perl".  If you have access to the
Internet, point your browser at http://www.perl.org/, the Perl Home Page.

# 12  
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:
# 13  
Old 08-29-2017
Thanks Tyler. Worked.

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