/usr/share/doc/dialog/examples/calendar-stdout is in dialog 1.3-20160209-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | #!/bin/sh
# $Id: calendar-stdout,v 1.6 2010/01/13 10:20:03 tom Exp $
. ./setup-vars
RESULT=`$DIALOG --stdout --title "CALENDAR" "$@" --calendar "Please choose a date..." 0 0 7 7 1981`
retval=$?
. ./report-string
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