diff --git a/README.md b/README.md
index 57f0d56..1f33707 100644
--- a/README.md
+++ b/README.md
@@ -6,8 +6,8 @@ Crontab:
 #
 */5 * * * *     ssh timelapse@192.168.111.2 "sudo date -s\"`date`\"" >/dev/null 2>&1
 0 * * * *       ${HOME}/timelapse/bin/timelapse_gatherer.sh
-0 2 * * *       rm /mnt/extern/timelapse/daily/*; ${HOME}/timelapse/bin/timelapse_daily.sh && ${HOME}/timelapse/bin/timelapse_video.sh daily
-0 3 * * 1       rm /mnt/extern/timelapse/weekly/*; ${HOME}/timelapse/bin/timelapse_weekly.sh && ${HOME}/timelapse/bin/timelapse_video.sh weekly
-0 3 1 * *       rm /mnt/extern/timelapse/monthly/*; ${HOME}/timelapse/bin/timelapse_monthly.sh && ${HOME}/timelapse/bin/timelapse_video.sh monthly; rm /mnt/extern/timelapse/yearly/*; ${HOME}/timelapse/bin/timelapse_yearly.sh && ${HOME}/timelapse/bin/timelapse_video.sh yearly
+0 2 * * *       rm -rf /mnt/extern/timelapse/daily/*; ${HOME}/timelapse/bin/timelapse_daily.sh && ${HOME}/timelapse/bin/timelapse_video.sh daily
+0 3 * * 1       rm -rf /mnt/extern/timelapse/weekly/*; ${HOME}/timelapse/bin/timelapse_weekly.sh && ${HOME}/timelapse/bin/timelapse_video.sh weekly
+0 3 1 * *       rm -rf /mnt/extern/timelapse/monthly/*; ${HOME}/timelapse/bin/timelapse_monthly.sh && ${HOME}/timelapse/bin/timelapse_video.sh monthly; rm -rf /mnt/extern/timelapse/yearly/*; ${HOME}/timelapse/bin/timelapse_yearly.sh && ${HOME}/timelapse/bin/timelapse_video.sh yearly
 0 9 * * 1       [[ "$(/bin/date +\%d)" -le 7 ]] && ${HOME}/timelapse/bin/timelapse_garbage_collector.sh # runs only the first monday a month
 ```
diff --git a/bin/timelapse_monthly.sh b/bin/timelapse_monthly.sh
index 1a59733..14211f0 100755
--- a/bin/timelapse_monthly.sh
+++ b/bin/timelapse_monthly.sh
@@ -9,7 +9,7 @@ CLIENT_FOLDER="/timelapse"
 if [[ "${1}" =~ [0-9]+ ]]
 then
 	MONTH=${1}
-	if [ ${MONTH} -lt 10 ]
+	if [ `expr length ${MONTH}` -lt 2 ]
 	then
 		MONTH="0${MONTH}"
 	fi