Multiplication error in shell script

I coded this shell script

#!/bin/bash

VAR1=`awk -F"#" '/futuro/ { print $1 }' config.conf`
HOST="www.odds.com/matches/soccer/"
ONEDAY=86400
TODAYN=`date +%s`
VAR2= expr $VAR1 \\* $ONEDAY
TODAY=`date -d @$(($TODAYN + $VAR2)) +%Y%m%d`
TOMORROW=`date -d @$(($TODAYN + $ONEDAY)) +%Y%m%d`
FULLTODAY=$HOST$TODAY"/"
FULLTOMORROW=$HOST$TOMORROW"/"

... some other stuff

but when I try to execute it, I get this error

riga 8: 1314967172 + : errore di sintassi: atteso un operando (il token di errore è "+ ")

where is the error?

Change

VAR2= expr $VAR1 \\* $ONEDAY

to

VAR2=$(( VAR1 * ONEDAY ))

But, you should be able to say this instead:

HOST="www.oddsportal.com/matches/soccer/"
DAYS=$(awk -F"#" '/futuro/ { print $1 }' config.conf)
TODAY=$(date -d "$DAYS days" +%Y%m%d)
FULLTODAY="${HOST}${TODAY}/"
FULLTOMORROW="${HOST}$(date -d "$TODAY + 1 day" +%Y%m%d)/"

VAR2 is not correctly initialized: its value is "". Maybe you forgot backticks.

But you should replace backticks by $( ... ) construct.

Moreover, expr is not the best way to do a multiplication here. Why not use $(( ... )) that you already use with additions?