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Full Discussion: How to derive the last Sunday's date when Current date value is passed
Top Forums Shell Programming and Scripting How to derive the last Sunday's date when Current date value is passed Post 302605843 by Corona688 on Thursday 8th of March 2012 04:38:30 PM
Old 03-08-2012
Seems to work.

Code:
$ date -d "20120308 - 4 days" +%Y%m%d
20120304

$

It's important to remember that this is a feature of GNU date only, and perhaps only newer versions of GNU date. Systems other than Linux are very unlikely to have it.
 

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LEARN ABOUT SUSE

tcal

TCAL(1) 						      General Commands Manual							   TCAL(1)

NAME

       Tcal - runs the Gcal program with the date of tomorrow's day.

SYNOPSIS

       tcal [--help | --version] | [--shift=[+|-]number] [Argument...]

DESCRIPTION

       Tcal  is  a program which runs gcal with a date set one day ahead (equivalent the --shift=1 option). All given arguments are passed unmodi-
       fied to the Gcal program. If the Gcal program shall be called with another date than tomorrow's date, this desired date can be selected	by
       using  the --shift=[+|-]number option, in which [+|-]number is the distance of days the desired date is distant from the actual date (works
       only for Gregorian years). The --shift option must be given before all other arguments which are passed to the Gcal program. An exit status
       of 0 means all processing is successfully done, any other value means an error has occured.

OPTIONS

       --help Print a usage message listing all available options, then exit successfully.

       --version
	      Print the version number, then exit successfully.

       --shift=[+|-]number
	      Define the displacement in [+|-]number days the desired date is distant from the actual date.

ENVIRONMENT

       GCALPROG
	      The  GCALPROG  environment  variable contains the file name of the executable Gcal program, which is used by Tcal to call Gcal. This
	      takes precedence over the file name `gcal', which is burned-in during the compilation step of tcal.

COPYRIGHT

Tcal Copyright (c) 1995, 96, 1997, 2000 Thomas Esken

       This software doesn't claim completeness, correctness or usability.  On principle I will not be liable for any damages or losses  (implicit
       or  explicit),  which  result from using or handling my software.  If you use this software, you agree without any exception to this agree-
       ment, which binds you LEGALLY !!

       Tcal is free software and distributed under the terms of the `GNU General Public License'; published by	the  `Free  Software  Foundation';
       version 2 or (at your option) any later version.

       Any suggestions, improvements, extensions, bug reports, donations, proposals for contract work, and so forth are welcome!  If you like this
       tool, I'd appreciate a postcard from you!

       Enjoy it   =8^)

AUTHOR

  ------------------------oOO	   \\_''/	OOo---------------------------
  Thomas Esken		     O	   (/o-o)     O  eMail: esken@gmx.net
  Im Hagenfeld 84		  ((  ^  ))	  Phone: +49 251 232585
  D-48147 Muenster; Germany    \____) ~ (____/	  MotD : 2old2live, 2young2die

SEE ALSO

       gcal(1), txt2gcal(1), gcal2txt(1).

								   June 14, 2000							   TCAL(1)
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