#!/bin/sh

DOW=`date --date="next monday" +"%d"`
DOW_TS=`date --date="next monday" +"%s"`

echo $DOW
echo $DOW_TS

NEXT_DOW_TS=$((DOW_TS + (7 * 24 * 3600)))
NEXT_DOW=`date --date="@$NEXT_DOW_TS" +"%d"`

echo $NEXT_DOW
echo $NEXT_DOW_TS