diff --git a/checkssl b/checkssl
index e3ce4d5..1c3b676 100755
--- a/checkssl
+++ b/checkssl
@@ -40,10 +40,11 @@
 # 2016-10-25 set defaults to REMOTE_EXTRA to none (1.10)
 # 2016-10-28 enable defining other ports in a file #11 (1.11)
 # 2016-10-28 add ability to specify REMOTE_EXTRA in file list (1.12)
+# 2017-01-01 updated checks from shellcheck (1.13)
 # ---------------------------------------------------------------------------
 
 PROGNAME=${0##*/}
-VERSION="1.12"
+VERSION="1.13"
 
 ORIGCMD="$0 $*"
 UPDATE_LOCATION="https://raw.githubusercontent.com/srvrco/checkssl/master/checkssl"
@@ -347,6 +348,7 @@ while IFS= read -r LINE; do
 
     PROBLEMS=""
     debug " --------------- domain ${DOMAIN}:${PORT} ${REMOTE_EXTRA}---------------------"
+    # shellcheck disable=SC2086
     CERTINFO=$(echo | openssl s_client -servername "${DOMAIN}" -connect "${DOMAIN}:${PORT}" ${REMOTE_EXTRA} 2>/dev/null | openssl x509 2>/dev/null)
     ISSUEDTO=$(echo "$CERTINFO" | openssl x509 -noout -subject 2>/dev/null|cut -d= -f 3-)
     [[ -z $ISSUEDTO ]] && ISSUEDTO="-"
@@ -372,11 +374,11 @@ while IFS= read -r LINE; do
     fi
     if [[ "$ENDDATE" != "-" ]]; then
       if [[ "$os" == "bsd" ]]; then
-        if [[ $(date -v +${RENEW_ALERT}d +%s) -gt $(date -j -f "%b %d %H:%M:%S %Y %Z" "$ENDDATE" +%s) ]]; then
+        if [[ $(date -v +"${RENEW_ALERT}d" +%s) -gt $(date -j -f "%b %d %H:%M:%S %Y %Z" "$ENDDATE" +%s) ]]; then
           PROBLEMS=$(echo "${PROBLEMS}- certificate near renewal date")
         fi
       elif [[ "$os" == "mac" ]]; then
-        if [[ $(date -v +${RENEW_ALERT}d +%s) -gt $(date -j -f "%b %d %H:%M:%S %Y %Z" "$ENDDATE" +%s) ]]; then
+        if [[ $(date -v +"${RENEW_ALERT}d" +%s) -gt $(date -j -f "%b %d %H:%M:%S %Y %Z" "$ENDDATE" +%s) ]]; then
           PROBLEMS=$(echo "${PROBLEMS}- certificate near renewal date")
         fi
       else