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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 303015845 by Yoda on Friday 13th of April 2018 10:15:47 PM
Old 04-13-2018
If you have python installed, here is an approach:-
Code:
import datetime

def previous_weekday(day, weekday):
        days_behind = weekday - day.weekday()
        if days_behind >= 0:
                days_behind -= 7
        return day + datetime.timedelta(days_behind)


files = ['FILE_NAME_20180413','FILE_NAME_20180404','FILE_NAME_20180410']

for file in files:
        day = datetime.date(int(file[10:-4]), int(file[14:-2]), int(file[16:]))

        # 0 - Monday, 1 - Tuesday ...
        if day.weekday() == 1:
                print(file, day.strftime("%Y%m%d"))
        else:
                prev_tuesday = previous_weekday(day, 1)
                print(file, prev_tuesday.strftime("%Y%m%d"))

Produces output:-
Code:
('FILE_NAME_20180413', '20180410')
('FILE_NAME_20180404', '20180403')
('FILE_NAME_20180410', '20180410')

 

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LEARN ABOUT OSX

widget_calendar

widget_calendar(n)					    widget::calendar Megawidget 					widget_calendar(n)

__________________________________________________________________________________________________________________________________________________

NAME

       widget_calendar - widget::calendar Megawidget

SYNOPSIS

       package require Tcl  8.4

       package require Tk  8.4

       package require widget  ?3.0?

       widget::calendar pathname ?options?

_________________________________________________________________

DESCRIPTION

       This package provides a calendar megawidget (snidget).

       widget::calendar pathname ?options?

WIDGET OPTIONS

       -command
	      A script to evaluate when a date was selected.

       -dateformat
	      The format of the date that is returned. Default: %m/%d/%Y.

       -firstday
	      Set first day the week, Either sunday or monday. It defaults to monday.

       -font  Select the font used in the widget. It defaults to Helvetica 9.

       -highlightcolor
	      Selects the background color for the day that has been selected. Default: #FFCC00

       -language
	      Specify  language of the calendar contents. The language is specified by abbreviations of the languge, for example: en - english, de
	      - german ...  It defaults to en.

	      Supported languages: en, de, fr, it, es, pt, ru, sv, zh, fi

       -shadecolor
	      Selects the color of the parts that have a shaded background. Default: #888888

       -showpast
	      Specify if the past shall be shown. It is a boolean value and defaults to 1.

       -textvariable
	      Specifies the name of a variable whose value is linked to the entry widget's contents.  Whenever the  variable  changes  value,  the
	      widget's contents are updated, and vice versa.

WIDGET COMMAND

       pathname get ?what?

       Returns	a  part  of  the  selected date or 'all'. The argument what selects the part. Valid values for what are: day, month, year and all.
       'all' is the default and returns the complete date in the format given with -dateformat.

DEFAULT BINDINGS

       On creation of the calendar widget the following bindings are installed.

       o      Up - Move to week before current date

       o      Down - Move to week after current date

       o      Left - Move to day before current date

       o      Right - Move to day after current date

       o      Control-Left - Move to month before current date

       o      Control-Right - Move to month after current date

       o      Control-Up - Move to year before current date

       o      Control-Down - Move to year after current date

EXAMPLE

	   package require widget::calendar ; # or widget::all
	   set t [widget::calendar .t]
	   pack $t -fill x -expand 1

KEYWORDS

       megawidget, snit, widget

widget								       0.93							widget_calendar(n)
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