diff --git a/src/scripts/entrypoint.sh b/src/scripts/entrypoint.sh
index 8885434..6d9d712 100644
--- a/src/scripts/entrypoint.sh
+++ b/src/scripts/entrypoint.sh
@@ -24,23 +24,18 @@ done
 echo "Done with startup"
 
 last_sync_file="/etc/letsencrypt/last_sync.txt"
-one_week_sec=604800
 
 # Instead of trying to run `cron` or something like that, just sleep and run `certbot`.
 while [ true ]; do
-    last_sync_sec=$(stat -c %Y "$last_sync_file")
-    now_sec=$(date -d now +%s)
-    runned_sec=$(( ($now_sec - $last_sync_sec) ))
-    is_finshed_week_sec=$(( ($one_week_sec - $runned_sec) ))
-
-    echo "Not run_certbot.sh"
-    if [ ! -e "$last_sync_file" ] || [ $is_finshed_week_sec -lt 0 ]; then
-        # recreate the file
+    if [ is_sync_required $last_sync_file ]; then
+        # recreate the file to persist the last sync timestamp
         touch "$last_sync_file"
 
         # run certbot to request all the ssl certs we can find
         echo "Run certbot"
         /scripts/run_certbot.sh
+    else
+        echo "Not run certbot"
     fi
 
     # Sleep for 1 week
diff --git a/src/scripts/util.sh b/src/scripts/util.sh
index d2446ce..9bc775b 100644
--- a/src/scripts/util.sh
+++ b/src/scripts/util.sh
@@ -75,3 +75,16 @@ get_certificate() {
         $letsencrypt_url -d $1 --http-01-port 1337 \
         --standalone --preferred-challenges http-01 --debug
 }
+
+is_sync_required() {
+    if [ ! -e "$1" ]; then
+        return true
+    fi
+    
+    one_week_sec=604800
+    last_sync_sec=$(stat -c %Y "$1")
+    now_sec=$(date -d now +%s)
+    last_sync_delta_sec=$(( ($now_sec - $last_sync_sec) ))
+    is_finshed_week_sec=$(( ($one_week_sec - $last_sync_delta_sec) ))
+    return $is_finshed_week_sec -lt 0
+}