diff --git a/src/Console/Commands/CountUniqueUser.php b/src/Console/Commands/CountUniqueUser.php
index 834e7d3..6953723 100644
--- a/src/Console/Commands/CountUniqueUser.php
+++ b/src/Console/Commands/CountUniqueUser.php
@@ -30,15 +30,14 @@ class CountUniqueUser extends Command
      */
     public function handle()
     {
-        $fromDate = Carbon::now()->subMonth()->startOfMonth()->toDateString();
-        $tillDate = Carbon::now()->subMonth()->endOfMonth()->toDateString();
-
-        $nbrUser = User::whereBetween('login_at', [$fromDate, $tillDate])->count();
-
-        DB::table('kpis_unique_users')->insert(['date' => $tillDate, 'value' => $nbrUser]);
-    }
-
-    private function countUniqueUser()
-    {
+        $nbrUser = User::whereBetween('login_at', [
+            Carbon::now()->subMonth()->startOfMonth(),
+            Carbon::now()->startOfMonth(),
+        ])->count();
+
+        DB::table('kpis_unique_users')->insert([
+            'date' => Carbon::now()->subMonth()->endOfMonth(),
+            'value' => $nbrUser,
+        ]);
     }
 }
diff --git a/src/Console/Commands/CountUser.php b/src/Console/Commands/CountUser.php
index 6efff5b..ebb377d 100644
--- a/src/Console/Commands/CountUser.php
+++ b/src/Console/Commands/CountUser.php
@@ -30,8 +30,9 @@ class CountUser extends Command
      */
     public function handle()
     {
-        $yesterday = Carbon::yesterday()->toDateString();
-        $nbrUser = User::where('login_at', '=', $yesterday)->count();
+        $yesterday = Carbon::yesterday();
+        $today = Carbon::today();
+        $nbrUser = User::whereBetween('login_at', [$yesterday, $today])->count();
 
         DB::table('kpis_users')->insert(['date' => $yesterday, 'value' => $nbrUser]);
     }
diff --git a/src/Console/Commands/DetermineStorageUsage.php b/src/Console/Commands/DetermineStorageUsage.php
index 3e0f8b0..a2dca78 100644
--- a/src/Console/Commands/DetermineStorageUsage.php
+++ b/src/Console/Commands/DetermineStorageUsage.php
@@ -38,7 +38,7 @@ public function handle()
     {
         $size = $this->getSizeInGB();
 
-        $date = Carbon::now()->subMonth()->endOfMonth()->toDateString();
+        $date = Carbon::now()->subMonth()->endOfMonth();
 
         DB::table('kpis_storage_usage')->insert(['date' => $date, 'value' => $size]);
     }
diff --git a/src/Requests.php b/src/Requests.php
index b77e01a..64ce099 100644
--- a/src/Requests.php
+++ b/src/Requests.php
@@ -10,7 +10,7 @@ class Requests
     public static function save($visits, $actions)
     {
         DB::transaction(function () use ($visits, $actions) {
-            $yesterday = Carbon::yesterday()->toDateString();
+            $yesterday = Carbon::yesterday();
             DB::table('kpis_actions')->insert(['date' => $yesterday, 'value' => $actions]);
             DB::table('kpis_visits')->insert(['date' => $yesterday, 'value' => $visits]);
         });
@@ -18,16 +18,18 @@ public static function save($visits, $actions)
 
     public static function getActions($year, $month)
     {
-        $start = Carbon::createFromDate($year, $month, 1)->toDateString();
-        $end = Carbon::createFromDate($year, $month, 1)->endOfMonth()->toDateString();
+        $start = Carbon::createFromDate($year, $month)->startOfMonth();
+        $end = $start->copy()->addMonth();
         $res = DB::table('kpis_actions')->whereBetween('date', [$start, $end])->sum('value');
+
         return $res;
     }
     public static function getVisits($year, $month)
     {
-        $start = Carbon::createFromDate($year, $month, 1)->toDateString();
-        $end = Carbon::createFromDate($year, $month, 1)->endOfMonth()->toDateString();
+        $start = Carbon::createFromDate($year, $month)->startOfMonth();
+        $end = $start->copy()->addMonth();
         $res = DB::table('kpis_visits')->whereBetween('date', [$start, $end])->sum('value');
+
         return $res;
     }
 }
diff --git a/src/Storage.php b/src/Storage.php
index 268eac7..febe939 100644
--- a/src/Storage.php
+++ b/src/Storage.php
@@ -9,8 +9,9 @@ class Storage
 {
     public static function getStorageUsage($year, $month)
     {
-        $date = Carbon::createFromDate($year, $month, 1)->endOfMonth()->toDateString();
+        $date = Carbon::createFromDate($year, $month, 1)->endOfMonth();
         $res = DB::table('kpis_storage_usage')->where('date', '=', $date)->sum('value');
+
         return $res;
     }
 }
diff --git a/src/User.php b/src/User.php
index 38644a2..cb21336 100644
--- a/src/User.php
+++ b/src/User.php
@@ -9,14 +9,19 @@ class User
 {
     public static function getUser($year, $month)
     {
-        $first = Carbon::createFromDate($year, $month, 1);
-        $last = $first->copy()->endOfMonth();
-        return DB::table('kpis_users')->whereBetween('date', [$first->toDateString(), $last->toDateString()])->sum('value');
+        $first = Carbon::createFromDate($year, $month)->startOfMonth();
+        $last = $first->copy()->addMonth();
+
+        return DB::table('kpis_users')
+            ->whereBetween('date', [$first, $last])
+            ->sum('value');
     }
+
     public static function getUniqueUser($year, $month)
     {
-        $date = Carbon::createFromDate($year, $month, 1)->endOfMonth()->toDateString();
+        $date = Carbon::createFromDate($year, $month, 1)->endOfMonth();
         $res =  DB::table('kpis_unique_users')->where('date', '=', $date)->sum('value');
+
         return $res;
     }
 }
diff --git a/tests/Console/Commands/CountUniqueUserTest.php b/tests/Console/Commands/CountUniqueUserTest.php
index 76c3a60..223c7c4 100644
--- a/tests/Console/Commands/CountUniqueUserTest.php
+++ b/tests/Console/Commands/CountUniqueUserTest.php
@@ -11,9 +11,9 @@ class CountUniqueUserTest extends TestCase
 {
     public function testHandle()
     {
-        UserTest::create(['login_at' => Carbon::now()->subMonth()->firstOfMonth()->toDateString()]);
-        UserTest::create(['login_at' => Carbon::now()->subMonth()->toDateString()]);
-        UserTest::create(['login_at' => Carbon::now()->subMonth()->endOfMonth()->toDateString()]);
+        UserTest::create(['login_at' => Carbon::now()->subMonth()->firstOfMonth()]);
+        UserTest::create(['login_at' => Carbon::now()->subMonth()]);
+        UserTest::create(['login_at' => Carbon::now()->subMonth()->endOfMonth()]);
 
         $this->artisan('kpis:count-unique-user')->assertExitCode(0);
 
@@ -28,8 +28,8 @@ public function testHandle()
 
     public function testLoginWasNotLastMonth()
     {
-        UserTest::create(['login_at' => Carbon::now()->subMonth()->firstOfMonth()->toDateString()]);
-        UserTest::create(['login_at' => Carbon::now()->subMonths(2)->endOfMonth()->toDateString()]);
+        UserTest::create(['login_at' => Carbon::now()->subMonth()->firstOfMonth()]);
+        UserTest::create(['login_at' => Carbon::now()->subMonths(2)->endOfMonth()]);
 
         $this->artisan('kpis:count-unique-user')->assertExitCode(0);
 
diff --git a/tests/Console/Commands/CountUserTest.php b/tests/Console/Commands/CountUserTest.php
index c73f4af..8d6fcd5 100644
--- a/tests/Console/Commands/CountUserTest.php
+++ b/tests/Console/Commands/CountUserTest.php
@@ -11,14 +11,14 @@ class CountUserTest extends TestCase
 {
     public function testHandle()
     {
-        $yesterday = Carbon::yesterday()->toDateString();
+        $yesterday = Carbon::now()->subDay();
 
         UserTest::create(['login_at' => $yesterday]);
         UserTest::create(['login_at' => $yesterday]);
 
         $this->artisan('kpis:count-user')->assertExitCode(0);
 
-        $users = DB::table('kpis_users')->where('date', '=', $yesterday)->pluck('value');
+        $users = DB::table('kpis_users')->where('date', '=', $yesterday->toDateString())->pluck('value');
 
         $this->assertCount(1, $users);
         $this->assertEquals(2, $users[0]);
@@ -28,14 +28,14 @@ public function testHandle()
     public function testDifferentLogInDates()
     {
 
-        $yesterday = Carbon::yesterday()->toDateString();
+        $yesterday = Carbon::now()->subDay();
 
         UserTest::create(['login_at' => $yesterday]);
-        UserTest::create(['login_at' => Carbon::now()->subDays(2)->toDateString()]);
+        UserTest::create(['login_at' => Carbon::now()->subDays(2)]);
 
         $this->artisan('kpis:count-user')->assertExitCode(0);
 
-        $users = DB::table('kpis_users')->where('date', '=', $yesterday)->pluck('value');
+        $users = DB::table('kpis_users')->where('date', '=', $yesterday->toDateString())->pluck('value');
 
         $this->assertCount(1, $users);
         $this->assertEquals(1, $users[0]);
diff --git a/tests/RequestsTest.php b/tests/RequestsTest.php
index 5dbba18..8fee12f 100644
--- a/tests/RequestsTest.php
+++ b/tests/RequestsTest.php
@@ -46,17 +46,18 @@ public function testGetActions()
     {
         $date = Carbon::now()->subMonth()->lastOfMonth();
 
-        DB::table('kpis_actions')->insert(['date' => $date->toDateString(), 'value' => 10]);
+        DB::table('kpis_actions')->insert(['date' => $date, 'value' => 10]);
 
         $count = Requests::getActions($date->year, $date->month);
 
         $this->assertEquals(10, $count);
     }
+
     public function testGetVisits()
     {
         $date = Carbon::now()->subMonth()->lastOfMonth();
 
-        DB::table('kpis_visits')->insert(['date' => $date->toDateString(), 'value' => 10]);
+        DB::table('kpis_visits')->insert(['date' => $date, 'value' => 10]);
 
         $count = Requests::getVisits($date->year, $date->month);
 
diff --git a/tests/StorageTest.php b/tests/StorageTest.php
index 9a4df31..8478145 100644
--- a/tests/StorageTest.php
+++ b/tests/StorageTest.php
@@ -16,7 +16,7 @@ public function testGetStorage()
 
         $noFiles = Storage::getStorageUsage($date->year, $date->month);
 
-        DB::table('kpis_storage_usage')->insert(['date' => $date->toDateString(), 'value' => 100]);
+        DB::table('kpis_storage_usage')->insert(['date' => $date, 'value' => 100]);
 
         $size = Storage::getStorageUsage($date->year, $date->month);
 
diff --git a/tests/UserTest.php b/tests/UserTest.php
index e457f19..e9e0986 100644
--- a/tests/UserTest.php
+++ b/tests/UserTest.php
@@ -17,8 +17,8 @@ public function testGetUser(){
 
         $noUserCounted = User::getUser($first->year, $first->month);
 
-        DB::table('kpis_users')->insert(['date' => $first->toDateString(), 'value' => 10]);
-        DB::table('kpis_users')->insert(['date' => $last->toDateString(), 'value' => 10]);
+        DB::table('kpis_users')->insert(['date' => $first, 'value' => 10]);
+        DB::table('kpis_users')->insert(['date' => $last, 'value' => 10]);
 
         $count = User::getUser($first->year, $first->month);
 
@@ -31,7 +31,7 @@ public function testGetUniqueUser(){
 
         $noUserCounted = User::getUniqueUser($date->year, $date->month);
 
-        DB::table('kpis_unique_users')->insert(['date' => $date->toDateString(), 'value' => 10]);
+        DB::table('kpis_unique_users')->insert(['date' => $date, 'value' => 10]);
 
         $count = User::getUniqueUser($date->year, $date->month);