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Full Discussion: Getting a Date value based on day
Top Forums Shell Programming and Scripting Getting a Date value based on day Post 303015846 by Don Cragun on Friday 13th of April 2018 10:44:19 PM
Old 04-13-2018
I asked what version of shell you're using, but you didn't provide an answer to that question. With a recent Korn shell, such as version 93u+, (which may be installed as ksh93 on AIX 7.1) you could try a simplified version of:
Code:
for file in "$@"
do	fd=${file##*_}
	printf 'File: %s: %(%a(%w), %Y-%m-%d)T, Previous Tuesday: %(%Y%m%d\n)T' \
	    "$file" "$fd" "$fd $((($(printf '%(%u)T' "$fd")+5)%7)) days ago"
done

which if invoked with the operands FILE_NAME_20180410, FILE_NAME_20180413, and FILE_NAME_20180409 produces the output:
Code:
File: FILE_NAME_20180410: Tue(2), 2018-04-10, Previous Tuesday: 20180410
File: FILE_NAME_20180413: Fri(5), 2018-04-13, Previous Tuesday: 20180410
File: FILE_NAME_20180409: Mon(1), 2018-04-09, Previous Tuesday: 20180403

Last edited by Don Cragun; 04-14-2018 at 12:02 AM.. Reason: Fix typo: doubled \n in printf format.
This User Gave Thanks to Don Cragun For This Post:
vgersh99
 

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LEARN ABOUT CENTOS

datetime::locale::en

DateTime::Locale::en(3) 				User Contributed Perl Documentation				   DateTime::Locale::en(3)

NAME

       DateTime::Locale::en

SYNOPSIS

	 use DateTime;

	 my $dt = DateTime->now( locale => 'en' );
	 print $dt->month_name();

DESCRIPTION

       This is the DateTime locale package for English.

DATA

       This locale inherits from the DateTime::Locale::root locale.

       It contains the following data.

   Days
       Wide (format)

	 Monday
	 Tuesday
	 Wednesday
	 Thursday
	 Friday
	 Saturday
	 Sunday

       Abbreviated (format)

	 Mon
	 Tue
	 Wed
	 Thu
	 Fri
	 Sat
	 Sun

       Narrow (format)

	 M
	 T
	 W
	 T
	 F
	 S
	 S

       Wide (stand-alone)

	 Monday
	 Tuesday
	 Wednesday
	 Thursday
	 Friday
	 Saturday
	 Sunday

       Abbreviated (stand-alone)

	 Mon
	 Tue
	 Wed
	 Thu
	 Fri
	 Sat
	 Sun

       Narrow (stand-alone)

	 M
	 T
	 W
	 T
	 F
	 S
	 S

   Months
       Wide (format)

	 January
	 February
	 March
	 April
	 May
	 June
	 July
	 August
	 September
	 October
	 November
	 December

       Abbreviated (format)

	 Jan
	 Feb
	 Mar
	 Apr
	 May
	 Jun
	 Jul
	 Aug
	 Sep
	 Oct
	 Nov
	 Dec

       Narrow (format)

	 J
	 F
	 M
	 A
	 M
	 J
	 J
	 A
	 S
	 O
	 N
	 D

       Wide (stand-alone)

	 January
	 February
	 March
	 April
	 May
	 June
	 July
	 August
	 September
	 October
	 November
	 December

       Abbreviated (stand-alone)

	 Jan
	 Feb
	 Mar
	 Apr
	 May
	 Jun
	 Jul
	 Aug
	 Sep
	 Oct
	 Nov
	 Dec

       Narrow (stand-alone)

	 J
	 F
	 M
	 A
	 M
	 J
	 J
	 A
	 S
	 O
	 N
	 D

   Quarters
       Wide (format)

	 1st quarter
	 2nd quarter
	 3rd quarter
	 4th quarter

       Abbreviated (format)

	 Q1
	 Q2
	 Q3
	 Q4

       Narrow (format)

	 1
	 2
	 3
	 4

       Wide (stand-alone)

	 1st quarter
	 2nd quarter
	 3rd quarter
	 4th quarter

       Abbreviated (stand-alone)

	 Q1
	 Q2
	 Q3
	 Q4

       Narrow (stand-alone)

	 1
	 2
	 3
	 4

   Eras
       Wide

	 Before Christ
	 Anno Domini

       Abbreviated

	 BC
	 AD

       Narrow

	 B
	 A

   Date Formats
       Full

	  2008-02-05T18:30:30 = Tuesday, February 5, 2008
	  1995-12-22T09:05:02 = Friday, December 22, 1995
	 -0010-09-15T04:44:23 = Saturday, September 15, -10

       Long

	  2008-02-05T18:30:30 = February 5, 2008
	  1995-12-22T09:05:02 = December 22, 1995
	 -0010-09-15T04:44:23 = September 15, -10

       Medium

	  2008-02-05T18:30:30 = Feb 5, 2008
	  1995-12-22T09:05:02 = Dec 22, 1995
	 -0010-09-15T04:44:23 = Sep 15, -10

       Short

	  2008-02-05T18:30:30 = 2/5/08
	  1995-12-22T09:05:02 = 12/22/95
	 -0010-09-15T04:44:23 = 9/15/-10

       Default

	  2008-02-05T18:30:30 = Feb 5, 2008
	  1995-12-22T09:05:02 = Dec 22, 1995
	 -0010-09-15T04:44:23 = Sep 15, -10

   Time Formats
       Full

	  2008-02-05T18:30:30 = 6:30:30 PM UTC
	  1995-12-22T09:05:02 = 9:05:02 AM UTC
	 -0010-09-15T04:44:23 = 4:44:23 AM UTC

       Long

	  2008-02-05T18:30:30 = 6:30:30 PM UTC
	  1995-12-22T09:05:02 = 9:05:02 AM UTC
	 -0010-09-15T04:44:23 = 4:44:23 AM UTC

       Medium

	  2008-02-05T18:30:30 = 6:30:30 PM
	  1995-12-22T09:05:02 = 9:05:02 AM
	 -0010-09-15T04:44:23 = 4:44:23 AM

       Short

	  2008-02-05T18:30:30 = 6:30 PM
	  1995-12-22T09:05:02 = 9:05 AM
	 -0010-09-15T04:44:23 = 4:44 AM

       Default

	  2008-02-05T18:30:30 = 6:30:30 PM
	  1995-12-22T09:05:02 = 9:05:02 AM
	 -0010-09-15T04:44:23 = 4:44:23 AM

   Datetime Formats
       Full

	  2008-02-05T18:30:30 = Tuesday, February 5, 2008 6:30:30 PM UTC
	  1995-12-22T09:05:02 = Friday, December 22, 1995 9:05:02 AM UTC
	 -0010-09-15T04:44:23 = Saturday, September 15, -10 4:44:23 AM UTC

       Long

	  2008-02-05T18:30:30 = February 5, 2008 6:30:30 PM UTC
	  1995-12-22T09:05:02 = December 22, 1995 9:05:02 AM UTC
	 -0010-09-15T04:44:23 = September 15, -10 4:44:23 AM UTC

       Medium

	  2008-02-05T18:30:30 = Feb 5, 2008 6:30:30 PM
	  1995-12-22T09:05:02 = Dec 22, 1995 9:05:02 AM
	 -0010-09-15T04:44:23 = Sep 15, -10 4:44:23 AM

       Short

	  2008-02-05T18:30:30 = 2/5/08 6:30 PM
	  1995-12-22T09:05:02 = 12/22/95 9:05 AM
	 -0010-09-15T04:44:23 = 9/15/-10 4:44 AM

       Default

	  2008-02-05T18:30:30 = Feb 5, 2008 6:30:30 PM
	  1995-12-22T09:05:02 = Dec 22, 1995 9:05:02 AM
	 -0010-09-15T04:44:23 = Sep 15, -10 4:44:23 AM

   Available Formats
       d (d)

	  2008-02-05T18:30:30 = 5
	  1995-12-22T09:05:02 = 22
	 -0010-09-15T04:44:23 = 15

       EEEd (d EEE)

	  2008-02-05T18:30:30 = 5 Tue
	  1995-12-22T09:05:02 = 22 Fri
	 -0010-09-15T04:44:23 = 15 Sat

       Hm (H:mm)

	  2008-02-05T18:30:30 = 18:30
	  1995-12-22T09:05:02 = 9:05
	 -0010-09-15T04:44:23 = 4:44

       hm (h:mm a)

	  2008-02-05T18:30:30 = 6:30 PM
	  1995-12-22T09:05:02 = 9:05 AM
	 -0010-09-15T04:44:23 = 4:44 AM

       Hms (H:mm:ss)

	  2008-02-05T18:30:30 = 18:30:30
	  1995-12-22T09:05:02 = 9:05:02
	 -0010-09-15T04:44:23 = 4:44:23

       hms (h:mm:ss a)

	  2008-02-05T18:30:30 = 6:30:30 PM
	  1995-12-22T09:05:02 = 9:05:02 AM
	 -0010-09-15T04:44:23 = 4:44:23 AM

       M (L)

	  2008-02-05T18:30:30 = 2
	  1995-12-22T09:05:02 = 12
	 -0010-09-15T04:44:23 = 9

       Md (M/d)

	  2008-02-05T18:30:30 = 2/5
	  1995-12-22T09:05:02 = 12/22
	 -0010-09-15T04:44:23 = 9/15

       MEd (E, M/d)

	  2008-02-05T18:30:30 = Tue, 2/5
	  1995-12-22T09:05:02 = Fri, 12/22
	 -0010-09-15T04:44:23 = Sat, 9/15

       MMM (LLL)

	  2008-02-05T18:30:30 = Feb
	  1995-12-22T09:05:02 = Dec
	 -0010-09-15T04:44:23 = Sep

       MMMd (MMM d)

	  2008-02-05T18:30:30 = Feb 5
	  1995-12-22T09:05:02 = Dec 22
	 -0010-09-15T04:44:23 = Sep 15

       MMMEd (E, MMM d)

	  2008-02-05T18:30:30 = Tue, Feb 5
	  1995-12-22T09:05:02 = Fri, Dec 22
	 -0010-09-15T04:44:23 = Sat, Sep 15

       MMMMd (MMMM d)

	  2008-02-05T18:30:30 = February 5
	  1995-12-22T09:05:02 = December 22
	 -0010-09-15T04:44:23 = September 15

       MMMMEd (E, MMMM d)

	  2008-02-05T18:30:30 = Tue, February 5
	  1995-12-22T09:05:02 = Fri, December 22
	 -0010-09-15T04:44:23 = Sat, September 15

       ms (mm:ss)

	  2008-02-05T18:30:30 = 30:30
	  1995-12-22T09:05:02 = 05:02
	 -0010-09-15T04:44:23 = 44:23

       y (y)

	  2008-02-05T18:30:30 = 2008
	  1995-12-22T09:05:02 = 1995
	 -0010-09-15T04:44:23 = -10

       yM (M/yyyy)

	  2008-02-05T18:30:30 = 2/2008
	  1995-12-22T09:05:02 = 12/1995
	 -0010-09-15T04:44:23 = 9/-010

       yMEd (EEE, M/d/yyyy)

	  2008-02-05T18:30:30 = Tue, 2/5/2008
	  1995-12-22T09:05:02 = Fri, 12/22/1995
	 -0010-09-15T04:44:23 = Sat, 9/15/-010

       yMMM (MMM y)

	  2008-02-05T18:30:30 = Feb 2008
	  1995-12-22T09:05:02 = Dec 1995
	 -0010-09-15T04:44:23 = Sep -10

       yMMMEd (EEE, MMM d, y)

	  2008-02-05T18:30:30 = Tue, Feb 5, 2008
	  1995-12-22T09:05:02 = Fri, Dec 22, 1995
	 -0010-09-15T04:44:23 = Sat, Sep 15, -10

       yMMMM (MMMM y)

	  2008-02-05T18:30:30 = February 2008
	  1995-12-22T09:05:02 = December 1995
	 -0010-09-15T04:44:23 = September -10

       yQ (Q yyyy)

	  2008-02-05T18:30:30 = 1 2008
	  1995-12-22T09:05:02 = 4 1995
	 -0010-09-15T04:44:23 = 3 -010

       yQQQ (QQQ y)

	  2008-02-05T18:30:30 = Q1 2008
	  1995-12-22T09:05:02 = Q4 1995
	 -0010-09-15T04:44:23 = Q3 -10

   Miscellaneous
       Prefers 24 hour time?

       No

       Local first day of the week

       Monday

SUPPORT

       See DateTime::Locale.

AUTHOR

       Dave Rolsky <autarch@urth.org>

COPYRIGHT

       Copyright (c) 2008 David Rolsky. All rights reserved. This program is free software; you can redistribute it and/or modify it under the
       same terms as Perl itself.

       This module was generated from data provided by the CLDR project, see the LICENSE.cldr in this distribution for details on the CLDR data's
       license.

perl v5.16.3							    2014-06-10						   DateTime::Locale::en(3)
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