move relative_date() function to includes files

lib/bkctld-rm

@@ -7,16 +7,6 @@
 # shellcheck source=./includes
 LIBDIR="$(dirname $0)" && . "${LIBDIR}/includes"
 
-relative_date() {
-    format=$(echo $1 | cut -d'.' -f1)
-    time_jump=$(echo $1 | cut -d'.' -f2)
-
-    reference_date=$(date "${format}")
-    past_date=$(date --date "${reference_date} ${time_jump}" +"%Y-%m-%d")
-
-    echo ${past_date}
-}
-
 delete_inc_btrfs() {
     jail_name=$1
     inc_name=$2

lib/includes

@@ -158,6 +158,16 @@ current_jail_check_policy_file() {
         echo ""
     fi
 }
+# relative_date "+%Y-%m-%d.-2day"
+relative_date() {
+    format=$(echo $1 | cut -d'.' -f1)
+    time_jump=$(echo $1 | cut -d'.' -f2)
+
+    reference_date=$(date "${format}")
+    past_date=$(date --date "${reference_date} ${time_jump}" +"%Y-%m-%d")
+
+    echo ${past_date}
+}
 
 setup_jail_chroot() {
     jail_name=${1:?}