diff --git a/examples/example1.php b/examples/example1.php
index a4004419..945c0852 100644
--- a/examples/example1.php
+++ b/examples/example1.php
@@ -31,8 +31,8 @@
     ->setDescription('Lorem Ipsum Dolor...')
     ->setOccurrence(
         new TimeSpan(
-            new DateTime(DateTimeImmutable::createFromFormat('Y-m-d H:i:s', '2030-12-24 13:30:00'), false),
-            new DateTime(DateTimeImmutable::createFromFormat('Y-m-d H:i:s', '2030-12-24 14:30:00'), false)
+            new DateTime(DateTimeImmutable::createFromFormat('Y-m-d H:i:s', '2030-12-24 13:30:00'), true),
+            new DateTime(DateTimeImmutable::createFromFormat('Y-m-d H:i:s', '2030-12-24 14:30:00'), true)
         )
     )
     ->addAlarm(
diff --git a/src/Presentation/Component/Property.php b/src/Presentation/Component/Property.php
index c2794a10..2a8e48c1 100644
--- a/src/Presentation/Component/Property.php
+++ b/src/Presentation/Component/Property.php
@@ -42,7 +42,7 @@ public function __toString(): string
         $string = $this->name;
 
         if (count($this->parameters) > 0) {
-            $string .= ':' . implode(';', array_map('strval', $this->parameters));
+            $string .= ';' . implode(';', array_map('strval', $this->parameters));
         }
 
         return $string . ':' . $this->value;
diff --git a/tests/Unit/Presentation/Component/PropertyTest.php b/tests/Unit/Presentation/Component/PropertyTest.php
index 1a85684f..2cc74d0f 100644
--- a/tests/Unit/Presentation/Component/PropertyTest.php
+++ b/tests/Unit/Presentation/Component/PropertyTest.php
@@ -42,7 +42,7 @@ public function provideTestData()
             [
                 new Parameter('TEST', new TextValue('value')),
             ],
-            'LOREM:TEST=value:Ipsum',
+            'LOREM;TEST=value:Ipsum',
         ];
 
         yield 'property with multiple parameters' => [
@@ -52,7 +52,7 @@ public function provideTestData()
                 new Parameter('TEST', new TextValue('value')),
                 new Parameter('TEST2', new TextValue('value2')),
             ],
-            'LOREM:TEST=value;TEST2=value2:Ipsum',
+            'LOREM;TEST=value;TEST2=value2:Ipsum',
         ];
     }
 }
diff --git a/tests/Unit/Presentation/Factory/AlarmFactoryTest.php b/tests/Unit/Presentation/Factory/AlarmFactoryTest.php
index c804e3f0..f7173ac4 100644
--- a/tests/Unit/Presentation/Factory/AlarmFactoryTest.php
+++ b/tests/Unit/Presentation/Factory/AlarmFactoryTest.php
@@ -34,7 +34,7 @@ public function testAudioAlarm()
         $expected = implode(ContentLine::LINE_SEPARATOR, [
             'BEGIN:VALARM',
             'ACTION:AUDIO',
-            'TRIGGER:VALUE=DATE-TIME:20200930T000000',
+            'TRIGGER;VALUE=DATE-TIME:20200930T000000',
             'END:VALARM',
         ]);
 
@@ -58,7 +58,7 @@ public function testEmailAlarm()
             'ACTION:EMAIL',
             'SUMMARY:Summary Text',
             'DESCRIPTION:Description Text',
-            'TRIGGER:VALUE=DATE-TIME:20200930T000000',
+            'TRIGGER;VALUE=DATE-TIME:20200930T000000',
             'END:VALARM',
         ]);
 
@@ -81,7 +81,7 @@ public function testDisplayAlarm()
             'BEGIN:VALARM',
             'ACTION:DISPLAY',
             'DESCRIPTION:Description Text',
-            'TRIGGER:VALUE=DATE-TIME:20200930T000000',
+            'TRIGGER;VALUE=DATE-TIME:20200930T000000',
             'END:VALARM',
         ]);
 
@@ -125,7 +125,7 @@ public function testRepeat()
         $expected = implode(ContentLine::LINE_SEPARATOR, [
             'BEGIN:VALARM',
             'ACTION:AUDIO',
-            'TRIGGER:VALUE=DATE-TIME:20200930T000000',
+            'TRIGGER;VALUE=DATE-TIME:20200930T000000',
             'REPEAT:3',
             'DURATION:P1D',
             'END:VALARM',
diff --git a/tests/Unit/Presentation/Factory/DateTimeFactoryTest.php b/tests/Unit/Presentation/Factory/DateTimeFactoryTest.php
index be67ca14..c261cace 100644
--- a/tests/Unit/Presentation/Factory/DateTimeFactoryTest.php
+++ b/tests/Unit/Presentation/Factory/DateTimeFactoryTest.php
@@ -25,6 +25,6 @@ public function testCreateProperty(): void
 
         $property = (new DateTimeFactory())->createProperty('DTSTART', $dateTime);
 
-        self::assertSame('DTSTART:TZID=Europe/Berlin:20210122T111213', $property->__toString());
+        self::assertSame('DTSTART;TZID=Europe/Berlin:20210122T111213', $property->__toString());
     }
 }
diff --git a/tests/Unit/Presentation/Factory/EventFactoryTest.php b/tests/Unit/Presentation/Factory/EventFactoryTest.php
index b7de76aa..edbbc945 100644
--- a/tests/Unit/Presentation/Factory/EventFactoryTest.php
+++ b/tests/Unit/Presentation/Factory/EventFactoryTest.php
@@ -127,7 +127,7 @@ public function testUrlAttachments()
             );
 
         self::assertEventRendersCorrect($event, [
-            'ATTACH:FMTTYPE=text/plain:http://example.com/document.txt',
+            'ATTACH;FMTTYPE=text/plain:http://example.com/document.txt',
         ]);
     }
 
@@ -142,7 +142,7 @@ public function testFileAttachments()
             );
 
         self::assertEventRendersCorrect($event, [
-            'ATTACH:FMTTYPE=text/plain;ENCODING=BASE64;VALUE=BINARY:SGVsbG8gV29ybGQh',
+            'ATTACH;FMTTYPE=text/plain;ENCODING=BASE64;VALUE=BINARY:SGVsbG8gV29ybGQh',
         ]);
     }