diff --git a/bin/update b/bin/update
index 017806d..695bda1 100755
--- a/bin/update
+++ b/bin/update
@@ -46,11 +46,15 @@ _check_date_if_format() {
 
 _date_format() {
 
-    case $UPDATE_CHECK in
-        "daily") echo +%d/%m/%Y;;
-        "weekly") echo +%V/%Y;;
-        "monthly") echo +%m/%Y;;
-    esac
+    if [ "$UPDATE_CHECK_TYPE" = "sliding" ]; then
+        echo "+%s"
+    else
+        case $UPDATE_CHECK in
+            "daily") echo +%d/%m/%Y;;
+            "weekly") echo +%V/%Y;;
+            "monthly") echo +%m/%Y;;
+        esac
+    fi
 
 }
 
@@ -95,12 +99,27 @@ _check_date() {
 
     local old_date=`cat ~/.config/dotfiles/.data/update_date`
     local new_date=`date $1`
+    local updated=0
 
-    if [ "$new_date" != "$old_date" ] && [ ! -f ~/.config/dotfiles/.data/update_lock ]; then
+    if [ "$UPDATE_CHECK_TYPE" = "sliding" ]; then
+        local diff=$(($new_date - $old_date))
+        case $UPDATE_CHECK in
+            "daily") [ $diff -lt 86400 ] && updated=1;;
+            "weekly") [ $diff -lt 604800 ] && updated=1;;
+            "monthly") [$diff -lt 18748800 ] && updated=1;;
+        esac
+    else
+        if [ "$new_date" = "$old_date" ] ; then
+            updated=1
+        fi
+    fi
+
+    if [ $updated -eq 0 ] && [ ! -f ~/.config/dotfiles/.data/update_lock ]; then
         _sentence not_updated
     elif [ "$UPDATE_CHECK_ALWAYS" = "true" ] || [ "$2" = "force" ]; then
         _sentence updated
     fi
+
 }
 
 # Returns 0 if $1 > $2