Several enhancement to generate-cron-entry.sh (#45084)

ci-operator/config/openshift/openshift-tests-private/tools/generate-cron-entry.sh

@@ -39,18 +39,18 @@ if ! [[ "$TEST_NAME" =~ (p[1-3])?-f[0-9]+ ]] ; then
 fi
 
 FN="$(echo $TEST_NAME | sed -E 's/.*-f([0-9]+)(.*)?/\1/')"
-NUMBERS="$(echo $TEST_NAME $YAML_FILE | md5sum | tr -d [0a-z])"
+NUMBERS="$(echo $TEST_NAME $YAML_FILE | md5sum | tr [a-f] [1-6] | tr -d ' -')"
 if [[ $DEBUG = "true" ]] ; then
 	echo "FN: $FN"
 	echo "NUMBERS: $NUMBERS"
 fi
 
 
-let MINUTE=${NUMBERS:0:2}%60
-let HOUR=${NUMBERS:2:2}%24
-let DAY_OF_MONTH=${NUMBERS:4:2}%30+1
-let MONTH=${NUMBERS:6:2}%12+1
-let DAY_OF_WEEK=${NUMBERS:8:1}%7
+let MINUTE=10#${NUMBERS:0:2}%60
+let HOUR=10#${NUMBERS:2:2}%24
+let DAY_OF_MONTH=10#${NUMBERS:4:2}%30+1
+let MONTH=10#${NUMBERS:6:2}%12+1
+let DAY_OF_WEEK=10#${NUMBERS:8:1}%7
 
 if [[ $DEBUG = "true" ]] ; then
 	echo "MINUTE: $MINUTE"
@@ -69,7 +69,7 @@ case "$FN" in
 	2|3|4|5|6|7|10|14|28|30)
 		DAY_OF_MONTH_TMP=$DAY_OF_MONTH
 		for ((i=1 ; i<31/FN; ++i)) ; do
-			let TMP=(i*FN+DAY_OF_MONTH)%30+1
+			let TMP=(i*FN+DAY_OF_MONTH-1)%30+1
 			DAY_OF_MONTH_TMP+=",$TMP"
 		done
 		DAY_OF_MONTH_FINAL=$(echo $DAY_OF_MONTH_TMP | sed 's/,/\n/g' | sort -n | paste -s -d ',' -)