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/usr/share/doc/dialog/examples/calendar2 is in dialog 1.3-20171209-1.

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#!/bin/sh
# $Id: calendar2,v 1.8 2010/01/13 10:20:03 tom Exp $

. ./setup-vars

exec 3>&1
RESULT=`$DIALOG --title "CALENDAR" "$@" --calendar "Please choose a date..." 0 0 2>&1 1>&3`
retval=$?
exec 3>&-

. ./report-string