diff --git a/.github/workflows/php-unit-test.yml b/.github/workflows/php-unit-test.yml
index 8168ccb..585477e 100644
--- a/.github/workflows/php-unit-test.yml
+++ b/.github/workflows/php-unit-test.yml
@@ -18,7 +18,7 @@ jobs:
     strategy:
       matrix:
         operating-system: [ubuntu-20.04]
-        php-versions: ['7.4', '8.0', '8.1']
+        php-versions: ['7.4', '8.0', '8.1', '8.2']
 
     name: PHP ${{ matrix.php-versions }} Test on ${{ matrix.operating-system }}
     steps:
diff --git a/composer.json b/composer.json
index 0e92c79..0d15510 100644
--- a/composer.json
+++ b/composer.json
@@ -18,6 +18,7 @@
     },
     "scripts": {
         "php8test": "cd tests/docker; docker-compose run cli8 ash -c 'cd /src/tests; ../vendor/bin/phpunit --color TimeZoneConvert/AllTests.php'; cd ../..;",
-        "php81test": "cd tests/docker; docker-compose run cli81 ash -c 'cd /src/tests; ../vendor/bin/phpunit --color TimeZoneConvert/AllTests.php'; cd ../..;"
+        "php81test": "cd tests/docker; docker-compose run cli81 ash -c 'cd /src/tests; ../vendor/bin/phpunit --color TimeZoneConvert/AllTests.php'; cd ../..;",
+        "php82test": "cd tests/docker; docker-compose run cli82 ash -c 'cd /src/tests; ../vendor/bin/phpunit --color TimeZoneConvert/AllTests.php'; cd ../..;"
     }
 }
diff --git a/lib/TimeZoneConvert/VTimeZone.php b/lib/TimeZoneConvert/VTimeZone.php
index cfeef6f..c4c5854 100644
--- a/lib/TimeZoneConvert/VTimeZone.php
+++ b/lib/TimeZoneConvert/VTimeZone.php
@@ -17,7 +17,16 @@
 class TimeZoneConvert_VTimeZone
 {
     const EOL = "\r\n";
-    
+
+    protected $dateFormat = 'Y-m-d\TH:i:sP'; // DateTime::DATE_ATOM NOTE: In contrast to the docs Y is used instead of X
+
+    public function __construct()
+    {
+        if (PHP_VERSION_ID < 80200) {
+            $this->dateFormat = 'Y-m-d\TH:i:sO'; // DateTime::ISO8601;
+        }
+    }
+
     /**
      * gets php's DateTimeZone identifier from given VTIMEZONE and optional prodid
      * 
@@ -65,7 +74,7 @@ public function getVTimezone($tzid, $from=NULL, $until=NULL)
         
         $timezone = new DateTimeZone($tzid);
         $transitions = TimeZoneConvert_Transition::getTransitions($timezone, $from, $until);
-        
+
         $splitedTransitions = array(
             'DAYLIGHT' => $transitions->filter('isdst', TRUE),
             'STANDART' => $transitions->filter('isdst', FALSE),
@@ -80,7 +89,9 @@ public function getVTimezone($tzid, $from=NULL, $until=NULL)
             $transitionRule = TimeZoneConvert_TransitionRule::createFromTransition($transitions->getFirst());
             foreach($transitions as $transition) {
                 $expectedTransitionDate = $transitionRule->computeTransitionDate(substr($transition['time'], 0, 4));
-                if ($expectedTransitionDate->format(DateTime::ISO8601) != $transition['time']) {
+                if ($expectedTransitionDate->format($this->dateFormat) != $transition['time']) {
+                    echo $expectedTransitionDate->format($this->dateFormat) ."\n";
+                    echo $transition['time'] ."\n";
                     $useRrule = FALSE;
                     break;
                 }
@@ -95,7 +106,7 @@ public function getVTimezone($tzid, $from=NULL, $until=NULL)
                 
                 foreach ($backTransitions as $backTransition) {
                     $expectedTransitionDate = $transitionRule->computeTransitionDate(substr($backTransition['time'], 0, 4));
-                    if ($expectedTransitionDate->format(DateTime::ISO8601) != $backTransition['time']) {
+                    if ($expectedTransitionDate->format($this->dateFormat) != $backTransition['time']) {
                         break;
                     }
                     
@@ -231,7 +242,7 @@ public function getTransitions($transitionRules)
             foreach($transitionDates as $transitionDate) {
                 $transitions->addModel(new TimeZoneConvert_Transition(array(
                     'ts'     => $transitionDate->getTimestamp(),
-                    'date'   => $transitionDate->format(DateTime::ISO8601),
+                    'date'   => $transitionDate->format($this->dateFormat),
                     'offset' => $transitionRule->offset,
                     'isdst'  => $transitionRule->isdst,
                     'abbr'   => $transitionRule->abbr,
diff --git a/tests/TimeZoneConvert/VTimeZoneTests.php b/tests/TimeZoneConvert/VTimeZoneTests.php
index 8f8e310..8456b2f 100644
--- a/tests/TimeZoneConvert/VTimeZoneTests.php
+++ b/tests/TimeZoneConvert/VTimeZoneTests.php
@@ -260,7 +260,11 @@ public function testGetTransitionsRfc5545AmericaNewYork()
         $this->assertTrue(count($transitions) > 7, 'min. 7 transitions should be computed');
         
         $this->assertEquals(-84387600, $transitions[0]['ts']);
-        $this->assertEquals('1967-04-30T07:00:00+0000', $transitions[0]['date']);
+        if (PHP_VERSION_ID < 80200) {
+            $this->assertEquals('1967-04-30T07:00:00+0000', $transitions[0]['date']);
+        } else {
+            $this->assertEquals('1967-04-30T07:00:00+00:00', $transitions[0]['date']);
+        }
         $this->assertEquals(-14400, $transitions[0]['offset']);
         $this->assertEquals(TRUE, $transitions[0]['isdst']);
         $this->assertEquals('EDT', $transitions[0]['abbr']);
diff --git a/tests/docker/docker-compose.yml b/tests/docker/docker-compose.yml
index 4583983..c724591 100644
--- a/tests/docker/docker-compose.yml
+++ b/tests/docker/docker-compose.yml
@@ -22,6 +22,17 @@ services:
       # needed by PHPSTORM for debugging
       PHP_IDE_CONFIG: "serverName=timezoneconvert"
 
+  cli82:
+    build: ./php82/
+    volumes:
+      - ../../:/src/
+      - ./xdebug.ini:/usr/local/etc/php/conf.d/xdebug.ini:ro
+    networks:
+      - external_network
+    environment:
+      # needed by PHPSTORM for debugging
+      PHP_IDE_CONFIG: "serverName=timezoneconvert"
+
 networks:
   external_network:
     driver: bridge
diff --git a/tests/docker/php81/Dockerfile b/tests/docker/php81/Dockerfile
index c2b4fde..38d8de2 100644
--- a/tests/docker/php81/Dockerfile
+++ b/tests/docker/php81/Dockerfile
@@ -1,7 +1,3 @@
 FROM php:8.1-alpine
 
-RUN apk add --no-cache $PHPIZE_DEPS \
-    && pecl install xdebug \
-    && docker-php-ext-enable xdebug
-
-#RUN apk add --no-cache php8-pecl-xdebug
+RUN apk add --no-cache php81-pecl-xdebug
diff --git a/tests/docker/php82/Dockerfile b/tests/docker/php82/Dockerfile
new file mode 100644
index 0000000..e3e29a0
--- /dev/null
+++ b/tests/docker/php82/Dockerfile
@@ -0,0 +1,3 @@
+FROM php:8.2-alpine
+
+RUN apk add --no-cache php82-pecl-xdebug