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Full Discussion: Adding days to date
Top Forums Shell Programming and Scripting Adding days to date Post 302971594 by Don Cragun on Friday 22nd of April 2016 06:50:17 AM
Old 04-22-2016
You haven't told us what OS you're using and you haven't told us what shell you're using. If you had the GNU date utility, you could use date -d in a shell script (but you have said that is not an option). If you have a recent version of ksh, you could use:
Code:
x=10
printf '%(%Y-%m-%d)T\n' "now + $x days"

currently producing the output:
Code:
2016-05-02

Of course, it is easy just using a standard date utility, parameter expansions, and arithmetic expansions to get the current date, extract the current day of the month, add the desired number of days you want to go forward and reformat the day of the month in the date output you want as long as the resulting day number is no greater than 28.

Otherwise, if you're unwilling to use perl, you can use date to get the current date and build calendar logic into your shell script, or use date to get the current date and process output from cal to find the date x days later (or earlier).
 

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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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