diff --git a/web/clitools/maintain/pcloop.bash b/web/clitools/maintain/pcloop.bash
index dccf8dd..bd2e95a 100755
--- a/web/clitools/maintain/pcloop.bash
+++ b/web/clitools/maintain/pcloop.bash
@@ -1,4 +1,5 @@
 #!/bin/bash
+
 trap "exit" INT
 basedir=`dirname "$0"`
 cd "$basedir/.."
@@ -7,17 +8,17 @@ mailmta=`cat "${mailcfgfp}" | grep -P '^mta=' | sed -e 's/^mta=//' -e 's/^"//' -
 mailfrom=`cat "${mailcfgfp}" | grep -P '^from=' | sed -e 's/^from=//' -e 's/^"//' -e 's/"$//'`
 mailto=`cat "${mailcfgfp}" | grep -P '^to=' | sed -e 's/^to=//' -e 's/^"//' -e 's/"$//'`
 subj=""
-lastmailts=0
+lastmailts=$((0))
 newmailwait=$((12*60*60))
 resurrfp=".pcresurrectdone"
 cmdlogfp="peerscrawl.log"
 logfp="pcloop.log"
-resdom=25 # day of month when (or after when, if it has not been done already) to execute peerscrawl.php with a gracetime of 2 months
+resdom=$((25)) # day of month when (or after when, if it has not been done already) to execute peerscrawl.php with a gracetime of 2 months
 function log {
 	echo `date "+%Y-%m-%d %H:%M:%S.%N"` "${1}" >> "${logfp}"
 }
 while true; do
-	dom=$((`date "+%d"`+0))
+	dom=$(($(expr $(date "+%d") + 0)))
 	[ $dom -lt $resdom -a -f "$resurrfp" ] && rm "$resurrfp"
 	if [[ ($dom -ge $resdom ) && !(-f "$resurrfp") ]]; then # use a gracetime of 2 months
 		touch "$resurrfp"
@@ -31,11 +32,11 @@ while true; do
 	tail $cmdlogfp >> $logfp
 	log "### THE END ###"
 	cp "$cmdlogfp" "${cmdlogfp}.old"
-	now=$((`date "+%s"`+0))
+	now=$(($(expr $(date "+%s") + 0)))
 	if [ $(($now-$lastmailts)) -gt $newmailwait ]; then
 		[ $pcrv == "0" ] && subj="peerscrawl.php: tutto ok :-)" || subj="peerscrawl.php: uscito con errore: ${pcrv} :-("
 		tail $logfp | s-nail -s "${subj}" -S v15-compat -S from="${mailfrom}" -S smtp-use-starttls -S mta="${mailmta}" "${mailto}"
-		lastmailts=$((`date "+%s"`+0))
+		lastmailts=$(($(expr $(date "+%s") + 0)))
 	fi
 done
 exit 0;