diff --git a/log_helpers.sh b/log_helpers.sh
index 16e27f5..239dff2 100755
--- a/log_helpers.sh
+++ b/log_helpers.sh
@@ -25,13 +25,14 @@ log() {
     if [ -f "$log_file" ]; then
         touch $log_file
     fi
-    if [ $(wc -l < $log_file) > 100000 ]; then
+
+    if [[ "$(wc -l < $log_file)" > "100000" ]]; then
         # remove first line
         sed -e 1d -i $log_file
     fi
-    message="$(date +'%D_%T'): $*"
-    printf "$message\n" >&2
-    printf "$message\n" >> $log_file
+    local msg="$(date +'%Y-%m-%d_%T'): $*"
+    printf "$msg\n" >&2
+    printf "$msg\n" >> $log_file
 }
 
 log_debug() {