diff --git a/cli.php b/cli.php
index 6511b88..f484120 100644
--- a/cli.php
+++ b/cli.php
@@ -8,7 +8,7 @@ use Configuration\DatabaseScript;
 use Driver\SQL\Column\Column;
 use Driver\SQL\Condition\Compare;
 use Driver\SQL\Condition\CondIn;
-use Driver\SQL\Expression\DateAdd;
+use Driver\SQL\Expression\DateSub;
 use Objects\ConnectionData;
 use Objects\User;
 
@@ -169,7 +169,8 @@ function handleDatabase(array $argv) {
     $tables = [];
     $res = $sql->select("entityId", "tableName")
       ->from("EntityLog")
-      ->where(new Compare($sql->now(), new DateAdd(new Column("modified"), new Column("lifetime"), "DAY"), ">="))
+      ->where(new Compare("modified", new DateSub($sql->now(), new Column("lifetime"), "DAY"), "<="))
+      ->dump()
       ->execute();
 
     $success = ($res !== false);
diff --git a/core/Driver/SQL/Condition/Compare.class.php b/core/Driver/SQL/Condition/Compare.class.php
index 9a0229c..c9df65b 100644
--- a/core/Driver/SQL/Condition/Compare.class.php
+++ b/core/Driver/SQL/Condition/Compare.class.php
@@ -5,16 +5,16 @@ namespace Driver\SQL\Condition;
 class Compare extends Condition {
 
   private string $operator;
-  private $lhs;
+  private string $column;
   private $value;
 
-  public function __construct($col, $val, string $operator = '=') {
+  public function __construct(string $col, $val, string $operator = '=') {
     $this->operator = $operator;
-    $this->lhs = $col;
+    $this->column = $col;
     $this->value = $val;
   }
 
-  public function getLHS() { return $this->lhs; }
+  public function getColumn(): string { return $this->column; }
   public function getValue() { return $this->value; }
   public function getOperator(): string { return $this->operator; }
 
diff --git a/core/Driver/SQL/Expression/DateSub.class.php b/core/Driver/SQL/Expression/DateSub.class.php
new file mode 100644
index 0000000..f73e259
--- /dev/null
+++ b/core/Driver/SQL/Expression/DateSub.class.php
@@ -0,0 +1,23 @@
+<?php
+
+namespace Driver\SQL\Expression;
+
+use Driver\SQL\SQL;
+
+class DateSub extends Expression {
+
+  private Expression $lhs;
+  private Expression $rhs;
+  private string $unit;
+
+  public function __construct(Expression $lhs, Expression $rhs, string $unit) {
+    $this->lhs = $lhs;
+    $this->rhs = $rhs;
+    $this->unit = $unit;
+  }
+
+  public function getLHS(): Expression { return $this->lhs; }
+  public function getRHS(): Expression { return $this->rhs; }
+  public function getUnit(): string { return $this->unit; }
+
+}
\ No newline at end of file
diff --git a/core/Driver/SQL/MySQL.class.php b/core/Driver/SQL/MySQL.class.php
index a17cf39..5948a8b 100644
--- a/core/Driver/SQL/MySQL.class.php
+++ b/core/Driver/SQL/MySQL.class.php
@@ -18,6 +18,7 @@ use Driver\SQL\Condition\CondRegex;
 use Driver\SQL\Expression\Add;
 use Driver\SQL\Expression\CurrentTimeStamp;
 use Driver\SQL\Expression\DateAdd;
+use Driver\SQL\Expression\DateSub;
 use Driver\SQL\Expression\Expression;
 use Driver\SQL\Query\CreateProcedure;
 use Driver\SQL\Query\CreateTrigger;
@@ -195,7 +196,7 @@ class MySQL extends SQL {
           $columnName = $this->columnName($value->getName());
           $updateValues[] = "$leftColumn=VALUES($columnName)";
         } else if($value instanceof Add) {
-          $columnName = $this->columnName($value->getLHS());
+          $columnName = $this->columnName($value->getColumn());
           $operator = $value->getOperator();
           $value = $value->getValue();
           $updateValues[] = "$leftColumn=$columnName$operator" . $this->addValue($value, $params);
@@ -403,11 +404,12 @@ class MySQL extends SQL {
   }
 
   protected function createExpression(Expression $exp, array &$params) {
-    if ($exp instanceof DateAdd) {
+    if ($exp instanceof DateAdd || $exp instanceof DateSub) {
       $lhs = $this->addValue($exp->getLHS(), $params);
       $rhs = $this->addValue($exp->getRHS(), $params);
       $unit = $exp->getUnit();
-      return "DATE_ADD($lhs, INTERVAL $rhs $unit)";
+      $dateFunction = ($exp instanceof DateAdd ? "DATE_ADD" : "DATE_SUB");
+      return "$dateFunction($lhs, INTERVAL $rhs $unit)";
     } else if ($exp instanceof CurrentTimeStamp) {
       return "NOW()";
     } else {
diff --git a/core/Driver/SQL/PostgreSQL.class.php b/core/Driver/SQL/PostgreSQL.class.php
index 2ed6946..9333bec 100644
--- a/core/Driver/SQL/PostgreSQL.class.php
+++ b/core/Driver/SQL/PostgreSQL.class.php
@@ -18,6 +18,7 @@ use Driver\SQL\Condition\CondRegex;
 use Driver\SQL\Expression\Add;
 use Driver\SQL\Expression\CurrentTimeStamp;
 use Driver\SQL\Expression\DateAdd;
+use Driver\SQL\Expression\DateSub;
 use Driver\SQL\Expression\Expression;
 use Driver\SQL\Query\CreateProcedure;
 use Driver\SQL\Query\CreateTrigger;
@@ -155,7 +156,7 @@ class PostgreSQL extends SQL {
               $columnName = $this->columnName($value->getName());
               $updateValues[] = "$leftColumn=EXCLUDED.$columnName";
             } else if ($value instanceof Add) {
-              $columnName = $this->columnName($value->getLHS());
+              $columnName = $this->columnName($value->getColumn());
               $operator = $value->getOperator();
               $value = $value->getValue();
               $updateValues[] = "$leftColumn=$columnName$operator" . $this->addValue($value, $params);
@@ -419,7 +420,7 @@ class PostgreSQL extends SQL {
   }
 
   protected function createExpression(Expression $exp, array &$params) {
-    if ($exp instanceof DateAdd) {
+    if ($exp instanceof DateAdd || $exp instanceof DateSub) {
       $lhs = $this->addValue($exp->getLHS(), $params);
       $rhs = $this->addValue($exp->getRHS(), $params);
       $unit = $exp->getUnit();
@@ -430,7 +431,8 @@ class PostgreSQL extends SQL {
         $rhs = "$rhs $unit";
       }
 
-      return "$lhs + $rhs";
+      $operator = ($exp instanceof DateAdd ? "+" : "-");
+      return "$lhs $operator $rhs";
     } else if ($exp instanceof CurrentTimeStamp) {
       return "CURRENT_TIMESTAMP";
     } else {
diff --git a/core/Driver/SQL/SQL.class.php b/core/Driver/SQL/SQL.class.php
index b97bf8c..646e6af 100644
--- a/core/Driver/SQL/SQL.class.php
+++ b/core/Driver/SQL/SQL.class.php
@@ -16,7 +16,6 @@ use \Driver\SQL\Constraint\Unique;
 use \Driver\SQL\Constraint\PrimaryKey;
 use \Driver\SQL\Constraint\ForeignKey;
 use Driver\SQL\Expression\CurrentTimeStamp;
-use Driver\SQL\Expression\DateAdd;
 use Driver\SQL\Expression\Expression;
 use Driver\SQL\Query\AlterTable;
 use Driver\SQL\Query\CreateProcedure;
@@ -246,23 +245,19 @@ abstract class SQL {
       }
       return "(" . implode(" OR ", $conditions) . ")";
     } else if ($condition instanceof Compare) {
-      $lhs = $condition->getLHS();
-      $lhs = ($lhs instanceof Expression ?
-        $this->createExpression($lhs, $params) :
-        $this->columnName($lhs));
-
+      $column = $this->columnName($condition->getColumn());
       $value = $condition->getValue();
       $operator = $condition->getOperator();
 
       if ($value === null) {
         if ($operator === "=") {
-          return "$lhs IS NULL";
+          return "$column IS NULL";
         } else if ($operator === "!=") {
-          return "$lhs IS NOT NULL";
+          return "$column IS NOT NULL";
         }
       }
 
-      return $lhs . $operator . $this->addValue($value, $params);
+      return $column . $operator . $this->addValue($value, $params);
     } else if ($condition instanceof CondBool) {
       return $this->columnName($condition->getValue());
     } else if (is_array($condition)) {