diff --git a/src/Bundle/ChillMainBundle/Service/RollingDate/RollingDate.php b/src/Bundle/ChillMainBundle/Service/RollingDate/RollingDate.php
index 876c9dea3..e2657cde5 100644
--- a/src/Bundle/ChillMainBundle/Service/RollingDate/RollingDate.php
+++ b/src/Bundle/ChillMainBundle/Service/RollingDate/RollingDate.php
@@ -63,7 +63,7 @@ class RollingDate
 
     final public const T_YEAR_PREVIOUS_START = 'year_previous_start';
 
-    private const NORMALIZATION_FORMAT = 'd-m-Y-H:i:s.u T';
+    private const NORMALIZATION_FORMAT = 'Y-m-d-H:i:s.u e';
 
     /**
      * @param string|self::T_*        $roll
@@ -95,7 +95,7 @@ class RollingDate
         return [
             'roll' => $this->getRoll(),
             'fixed_date' => $this->getFixedDate()?->format(self::NORMALIZATION_FORMAT),
-            'pivot_date' => $this->getPivotDate()->format(self::NORMALIZATION_FORMAT),
+            'pivot_date' => $this->getPivotDate()?->format(self::NORMALIZATION_FORMAT),
             'v' => 1,
         ];
     }
diff --git a/src/Bundle/ChillMainBundle/Tests/Services/RollingDate/RollingDateTest.php b/src/Bundle/ChillMainBundle/Tests/Services/RollingDate/RollingDateTest.php
index 3c7d01360..bd80e9ae8 100644
--- a/src/Bundle/ChillMainBundle/Tests/Services/RollingDate/RollingDateTest.php
+++ b/src/Bundle/ChillMainBundle/Tests/Services/RollingDate/RollingDateTest.php
@@ -29,17 +29,18 @@ class RollingDateTest extends TestCase
 
         self::assertEquals(RollingDate::T_YEAR_PREVIOUS_START, $actual->getRoll());
         self::assertNull($actual->getFixedDate());
-        self::assertEquals($date->getPivotDate()->getTimestamp(), $actual->getPivotDate()->getTimestamp());
+        self::assertEquals($date->getPivotDate()?->getTimestamp(), $actual->getPivotDate()?->getTimestamp());
     }
 
     public function testNormalizationDenormalizationProcessWithPivotDate(): void
     {
-        $date = new RollingDate(RollingDate::T_FIXED_DATE, $pivot = new \DateTimeImmutable('now'));
+        $date = new RollingDate(RollingDate::T_FIXED_DATE, $fixed = new \DateTimeImmutable('now'));
 
         $actual = RollingDate::fromNormalized($date->normalize());
 
         self::assertEquals(RollingDate::T_FIXED_DATE, $actual->getRoll());
-        self::assertEquals($pivot, $actual->getFixedDate());
-        self::assertEquals($date->getPivotDate()->getTimestamp(), $actual->getPivotDate()->getTimestamp());
+        self::assertEquals($fixed, $actual->getFixedDate());
+        self::assertEquals($date->getPivotDate()?->getTimestamp(), $actual->getPivotDate()?->getTimestamp());
     }
+
 }