diff --git a/Libs/Utils/ICalTimeZoneBuilder.php b/Libs/Utils/ICalTimeZoneBuilder.php
new file mode 100644
index 00000000..7dc93acf
--- /dev/null
+++ b/Libs/Utils/ICalTimeZoneBuilder.php
@@ -0,0 +1,184 @@
+<?php namespace libs\utils;
+/**
+ * Copyright 2021 OpenStack Foundation
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ **/
+use DateTimeZone;
+use DateTime;
+use DateInterval;
+use Eluceo\iCal\Component\Timezone;
+use Eluceo\iCal\Component\Calendar;
+use Eluceo\iCal\Component\TimezoneRule;
+use Eluceo\iCal\Property\Event\RecurrenceRule;
+/**
+ * Class ICalTimeZoneBuilder
+ * @package CalDAVClient\Facade\Utils
+ */
+final class ICalTimeZoneBuilder
+{
+    /**
+     * @param DateTimeZone $time_zone
+     * @return array
+     */
+    private static function calculateTimeRangeForTransitions(DateTimeZone $time_zone){
+        $now           = new  DateTime('now', $time_zone);
+        $year          = $now->format('Y');
+        return [new DateTime('1/1/'.$year, $time_zone),  new DateTime('1/1/'.($year + 1), $time_zone)];
+    }
+    /**
+     * @param array $trans
+     * @param int $former_offset
+     * @return DateTime
+     */
+    private static function convertStartDateFromUTC2Local(array $trans, $former_offset){
+        $dt     = new DateTime($trans['time'], new DateTimeZone('UTC'));
+        $hours  = abs($former_offset);
+        // START TIME IS ON UTC and should be converted to local using former offset
+        if($former_offset >= 0 )
+            $dt->add(new DateInterval("PT{$hours}H"));
+        else
+            $dt->sub(new DateInterval("PT{$hours}H"));
+        return $dt;
+    }
+    /**
+     * @param DateTime $dt
+     * @return RecurrenceRule
+     */
+    private static function calculateRecurrenceRule(DateTime $dt){
+        $r_rule        = new RecurrenceRule();
+        $r_rule->setFreq(RecurrenceRule::FREQ_YEARLY);
+        $r_rule->setByMonth(intval($dt->format('m')));
+        $r_rule->setByDay
+        (
+            self::translate2ByDay($dt)
+        );
+        return $r_rule;
+    }
+    /**
+     * @param $offset
+     * @return string
+     */
+    private static function calculateOffsetFrom($offset){
+        return sprintf('%s%02d%02d', $offset >= 0 ? '+' : '-', abs($offset), abs(($offset - floor($offset)) * 60));
+    }
+    /**
+     * @param  $offset
+     * @return string
+     */
+    private static function calculateOffsetTo($offset){
+        return sprintf('%s%02d%02d', $offset >= 0 ? '+' : '-', abs($offset), abs(($offset - floor($offset)) * 60));
+    }
+    /**
+     * @param DateTimeZone $time_zone
+     * @param string $calendar_prod_id
+     * @param bool $with_calendar_envelope
+     * @return Calendar|Timezone
+     */
+    public static function build(DateTimeZone $time_zone, $calendar_prod_id, $with_calendar_envelope = true){
+        // get all transitions for one current year and next
+        list($start_range, $end_range) = self::calculateTimeRangeForTransitions($time_zone);
+        $transitions   = $time_zone->getTransitions($start_range->getTimestamp(), $end_range->getTimestamp());
+        $vTimezone     = new Timezone($time_zone->getName());
+        $former_offset = null;
+        foreach ($transitions as $i => $trans) {
+            $current_time_zone_rule = null;
+            // skip the first entry...
+            if ($i == 0) {
+                // ... but remember the offset for the next TZOFFSETFROM value
+                $former_offset = $trans['offset'] / 3600;
+                continue;
+            }
+            // daylight saving time definition
+            if ($trans['isdst']) {
+                $current_time_zone_rule = new TimezoneRule(TimezoneRule::TYPE_DAYLIGHT);;
+            }
+            // standard time definition
+            else {
+                $current_time_zone_rule = new TimezoneRule(TimezoneRule::TYPE_STANDARD);;
+            }
+            if ($current_time_zone_rule) {
+                $offset = $trans['offset'] / 3600;
+                $dt     = self::convertStartDateFromUTC2Local($trans, $former_offset);
+                $current_time_zone_rule->setDtStart($dt);
+                $current_time_zone_rule->setTzOffsetFrom(self::calculateOffsetFrom($former_offset));
+                $current_time_zone_rule->setTzOffsetTo(self::calculateOffsetTo($offset));
+                // add abbreviated timezone name if available
+                if (!empty($trans['abbr'])) {
+                    $current_time_zone_rule->setTzName($trans['abbr']);
+                }
+                $former_offset = $offset;
+                $current_time_zone_rule->setRecurrenceRule(self::calculateRecurrenceRule($dt));
+                $vTimezone->addComponent($current_time_zone_rule);
+            }
+        }
+        if($with_calendar_envelope) {
+            $vCalendar = new Calendar(sprintf("'-//%s//EN'", $calendar_prod_id));
+            $vCalendar->setTimezone($vTimezone);
+            return $vCalendar;
+        };
+        return $vTimezone;
+    }
+    /**
+     * The BYDAY rule part specifies a COMMA-separated list of days of
+     * the week; SU indicates Sunday; MO indicates Monday; TU indicates
+     * Tuesday; WE indicates Wednesday; TH indicates Thursday; FR
+     * indicates Friday; and SA indicates Saturday.
+     * Each BYDAY value can also be preceded by a positive (+n) or
+     * negative (-n) integer.
+     * @see https://tools.ietf.org/html/rfc5545#section-3.3.10 (BYDAY)
+     * @see http://php.net/manual/en/datetime.formats.relative.php
+     * @param DateTime $dt)
+     * @return string
+     */
+    private static function translate2ByDay(DateTime $dt){
+        $day_name = substr(strtoupper($dt->format('D')), 0,2);
+        $ordinals = ['first', 'second', 'third', 'fourth', 'last'];
+        $day_nbr  = 0;
+        $is_last  = false;
+        foreach($ordinals as $idx => $ord){
+            $dt_n = self::buildOrdinalDateTime($ord, $dt);
+            if($dt_n->format('Y-m-d') == $dt->format('Y-m-d')){
+                $day_nbr = $idx  + 1;
+                if($ord == 'last'){
+                    $is_last = true;
+                    $day_nbr  = 1;
+                }
+                break;
+            }
+        }
+        return sprintf('%s%s%s', $is_last? '-':'', $day_nbr, $day_name);
+    }
+    /**
+     * @param string $ord
+     * @param DateTime $dt
+     * @return DateTime
+     */
+    private static function buildOrdinalDateTime($ord, DateTime $dt){
+        return new DateTime
+        (
+            date
+            ("Y-m-d",
+                strtotime
+                (
+                    sprintf
+                    (
+                        self::GetOrdinalDayQuery,
+                        $ord,
+                        $dt->format('l'),
+                        $dt->format('F'),
+                        $dt->format('Y')
+                    )
+                )
+            )
+        );
+    }
+    const GetOrdinalDayQuery = '%s %s of %s %s';
+}
diff --git a/composer.json b/composer.json
index b2fff89c..1c4c4965 100644
--- a/composer.json
+++ b/composer.json
@@ -48,7 +48,8 @@
         "stripe/stripe-php": "^6.37",
         "symfony/yaml": "4.2.2",
         "tecnickcom/tcpdf": "^6.2",
-        "league/flysystem-aws-s3-v3": "^1.0"
+        "league/flysystem-aws-s3-v3": "^1.0",
+        "eluceo/ical": "^0.15.0"
     },
     "require-dev": {
         "filp/whoops": "^2.0",
diff --git a/composer.lock b/composer.lock
index 608683cb..150929c6 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,20 +4,20 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
         "This file is @generated automatically"
     ],
-    "content-hash": "d69d9cd7118942b7482145f29363535a",
+    "content-hash": "5c278ba8a545150643c1d55aa6a8f570",
     "packages": [
         {
             "name": "aws/aws-sdk-php",
-            "version": "3.183.9",
+            "version": "3.185.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/aws/aws-sdk-php.git",
-                "reference": "3b3aafdceac4cb820e2ae65a8785e4d07db471a7"
+                "reference": "0e6ece3f9c4ab26bb20183c697fd36e1d55c1053"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/aws/aws-sdk-php/zipball/3b3aafdceac4cb820e2ae65a8785e4d07db471a7",
-                "reference": "3b3aafdceac4cb820e2ae65a8785e4d07db471a7",
+                "url": "https://api.github.com/repos/aws/aws-sdk-php/zipball/0e6ece3f9c4ab26bb20183c697fd36e1d55c1053",
+                "reference": "0e6ece3f9c4ab26bb20183c697fd36e1d55c1053",
                 "shasum": ""
             },
             "require": {
@@ -89,7 +89,7 @@
                 "s3",
                 "sdk"
             ],
-            "time": "2021-05-28T18:28:19+00:00"
+            "time": "2021-06-25T18:19:14+00:00"
         },
         {
             "name": "bacon/bacon-qr-code",
@@ -578,31 +578,32 @@
         },
         {
             "name": "doctrine/dbal",
-            "version": "2.13.1",
+            "version": "2.13.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/doctrine/dbal.git",
-                "reference": "c800380457948e65bbd30ba92cc17cda108bf8c9"
+                "reference": "8dd39d2ead4409ce652fd4f02621060f009ea5e4"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/doctrine/dbal/zipball/c800380457948e65bbd30ba92cc17cda108bf8c9",
-                "reference": "c800380457948e65bbd30ba92cc17cda108bf8c9",
+                "url": "https://api.github.com/repos/doctrine/dbal/zipball/8dd39d2ead4409ce652fd4f02621060f009ea5e4",
+                "reference": "8dd39d2ead4409ce652fd4f02621060f009ea5e4",
                 "shasum": ""
             },
             "require": {
-                "doctrine/cache": "^1.0",
+                "doctrine/cache": "^1.0|^2.0",
                 "doctrine/deprecations": "^0.5.3",
                 "doctrine/event-manager": "^1.0",
                 "ext-pdo": "*",
                 "php": "^7.1 || ^8"
             },
             "require-dev": {
-                "doctrine/coding-standard": "8.2.0",
+                "doctrine/coding-standard": "9.0.0",
                 "jetbrains/phpstorm-stubs": "2020.2",
                 "phpstan/phpstan": "0.12.81",
-                "phpunit/phpunit": "^7.5.20|^8.5|9.5.0",
+                "phpunit/phpunit": "^7.5.20|^8.5|9.5.5",
                 "squizlabs/php_codesniffer": "3.6.0",
+                "symfony/cache": "^4.4",
                 "symfony/console": "^2.0.5|^3.0|^4.0|^5.0",
                 "vimeo/psalm": "4.6.4"
             },
@@ -663,7 +664,7 @@
                 "sqlserver",
                 "sqlsrv"
             ],
-            "time": "2021-04-17T17:30:19+00:00"
+            "time": "2021-06-18T21:48:39+00:00"
         },
         {
             "name": "doctrine/deprecations",
@@ -1399,6 +1400,57 @@
             ],
             "time": "2021-04-01T18:37:14+00:00"
         },
+        {
+            "name": "eluceo/ical",
+            "version": "0.15.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/markuspoerschke/iCal.git",
+                "reference": "bdd24747587f6f9b10770a7b873a13e273f85f39"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/markuspoerschke/iCal/zipball/bdd24747587f6f9b10770a7b873a13e273f85f39",
+                "reference": "bdd24747587f6f9b10770a7b873a13e273f85f39",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^6.0"
+            },
+            "suggest": {
+                "ext-mbstring": "Massive performance enhancement of line folding"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "Eluceo\\iCal\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Markus Poerschke",
+                    "email": "markus@eluceo.de",
+                    "role": "Developer"
+                }
+            ],
+            "description": "The eluceo/iCal package offers a abstraction layer for creating iCalendars. You can easily create iCal files by using PHP object instead of typing your *.ics file by hand. The output will follow RFC 5545 as best as possible.",
+            "homepage": "https://github.com/markuspoerschke/iCal",
+            "keywords": [
+                "calendar",
+                "iCalendar",
+                "ical",
+                "ics",
+                "php calendar"
+            ],
+            "time": "2019-08-06T20:33:43+00:00"
+        },
         {
             "name": "erusev/parsedown",
             "version": "1.7.4",
@@ -1545,16 +1597,16 @@
         },
         {
             "name": "firebase/php-jwt",
-            "version": "v5.3.0",
+            "version": "v5.4.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/firebase/php-jwt.git",
-                "reference": "3c2d70f2e64e2922345e89f2ceae47d2463faae1"
+                "reference": "d2113d9b2e0e349796e72d2a63cf9319100382d2"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/firebase/php-jwt/zipball/3c2d70f2e64e2922345e89f2ceae47d2463faae1",
-                "reference": "3c2d70f2e64e2922345e89f2ceae47d2463faae1",
+                "url": "https://api.github.com/repos/firebase/php-jwt/zipball/d2113d9b2e0e349796e72d2a63cf9319100382d2",
+                "reference": "d2113d9b2e0e349796e72d2a63cf9319100382d2",
                 "shasum": ""
             },
             "require": {
@@ -1563,6 +1615,9 @@
             "require-dev": {
                 "phpunit/phpunit": ">=4.8 <=9"
             },
+            "suggest": {
+                "paragonie/sodium_compat": "Support EdDSA (Ed25519) signatures when libsodium is not present"
+            },
             "type": "library",
             "autoload": {
                 "psr-4": {
@@ -1591,7 +1646,7 @@
                 "jwt",
                 "php"
             ],
-            "time": "2021-05-20T17:37:02+00:00"
+            "time": "2021-06-23T19:00:23+00:00"
         },
         {
             "name": "glenscott/url-normalizer",
@@ -1632,21 +1687,21 @@
         },
         {
             "name": "google/apiclient",
-            "version": "v2.9.1",
+            "version": "v2.10.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/googleapis/google-api-php-client.git",
-                "reference": "2fb6e702aca5d68203fa737f89f6f774022494c6"
+                "reference": "11871e94006ce7a419bb6124d51b6f9ace3f679b"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/googleapis/google-api-php-client/zipball/2fb6e702aca5d68203fa737f89f6f774022494c6",
-                "reference": "2fb6e702aca5d68203fa737f89f6f774022494c6",
+                "url": "https://api.github.com/repos/googleapis/google-api-php-client/zipball/11871e94006ce7a419bb6124d51b6f9ace3f679b",
+                "reference": "11871e94006ce7a419bb6124d51b6f9ace3f679b",
                 "shasum": ""
             },
             "require": {
                 "firebase/php-jwt": "~2.0||~3.0||~4.0||~5.0",
-                "google/apiclient-services": "~0.13",
+                "google/apiclient-services": "~0.200",
                 "google/auth": "^1.10",
                 "guzzlehttp/guzzle": "~5.3.3||~6.0||~7.0",
                 "guzzlehttp/psr7": "^1.2",
@@ -1656,7 +1711,7 @@
             },
             "require-dev": {
                 "cache/filesystem-adapter": "^0.3.2|^1.1",
-                "composer/composer": "^1.10",
+                "composer/composer": "^1.10.22",
                 "dealerdirect/phpcodesniffer-composer-installer": "^0.7",
                 "phpcompatibility/php-compatibility": "^9.2",
                 "phpunit/phpunit": "^5.7||^8.5.13",
@@ -1693,33 +1748,36 @@
             "keywords": [
                 "google"
             ],
-            "time": "2021-01-19T17:48:59+00:00"
+            "time": "2021-06-25T14:25:44+00:00"
         },
         {
             "name": "google/apiclient-services",
-            "version": "v0.177.0",
+            "version": "v0.201.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/googleapis/google-api-php-client-services.git",
-                "reference": "316cbf9b02c575a140d8cbeca48a3ca0070fcd5a"
+                "reference": "ee1072221acf7c32e3de9b18e11fec3ab23ec38f"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/googleapis/google-api-php-client-services/zipball/316cbf9b02c575a140d8cbeca48a3ca0070fcd5a",
-                "reference": "316cbf9b02c575a140d8cbeca48a3ca0070fcd5a",
+                "url": "https://api.github.com/repos/googleapis/google-api-php-client-services/zipball/ee1072221acf7c32e3de9b18e11fec3ab23ec38f",
+                "reference": "ee1072221acf7c32e3de9b18e11fec3ab23ec38f",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.4"
+                "php": ">=5.6"
             },
             "require-dev": {
-                "phpunit/phpunit": "^4.8|^5"
+                "phpunit/phpunit": "^5.7||^8.5.13"
             },
             "type": "library",
             "autoload": {
-                "psr-0": {
-                    "Google_Service_": "src"
-                }
+                "psr-4": {
+                    "Google\\Service\\": "src"
+                },
+                "files": [
+                    "autoload.php"
+                ]
             },
             "notification-url": "https://packagist.org/downloads/",
             "license": [
@@ -1730,20 +1788,20 @@
             "keywords": [
                 "google"
             ],
-            "time": "2021-05-15T11:18:02+00:00"
+            "time": "2021-06-27T11:20:22+00:00"
         },
         {
             "name": "google/auth",
-            "version": "v1.15.1",
+            "version": "v1.16.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/googleapis/google-auth-library-php.git",
-                "reference": "4e0c9367719df9703e96f5ad613041b87742471c"
+                "reference": "c747738d2dd450f541f09f26510198fbedd1c8a0"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/googleapis/google-auth-library-php/zipball/4e0c9367719df9703e96f5ad613041b87742471c",
-                "reference": "4e0c9367719df9703e96f5ad613041b87742471c",
+                "url": "https://api.github.com/repos/googleapis/google-auth-library-php/zipball/c747738d2dd450f541f09f26510198fbedd1c8a0",
+                "reference": "c747738d2dd450f541f09f26510198fbedd1c8a0",
                 "shasum": ""
             },
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@@ -1751,7 +1809,7 @@
                 "guzzlehttp/guzzle": "^5.3.1|^6.2.1|^7.0",
                 "guzzlehttp/psr7": "^1.2",
                 "php": ">=5.4",
-                "psr/cache": "^1.0",
+                "psr/cache": "^1.0|^2.0",
                 "psr/http-message": "^1.0"
             },
             "require-dev": {
@@ -1782,7 +1840,7 @@
                 "google",
                 "oauth2"
             ],
-            "time": "2021-04-21T17:42:05+00:00"
+            "time": "2021-06-22T18:06:03+00:00"
         },
         {
             "name": "graham-campbell/guzzle-factory",
@@ -2773,16 +2831,16 @@
         },
         {
             "name": "league/flysystem",
-            "version": "1.1.3",
+            "version": "1.1.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/thephpleague/flysystem.git",
-                "reference": "9be3b16c877d477357c015cec057548cf9b2a14a"
+                "reference": "f3ad69181b8afed2c9edf7be5a2918144ff4ea32"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/thephpleague/flysystem/zipball/9be3b16c877d477357c015cec057548cf9b2a14a",
-                "reference": "9be3b16c877d477357c015cec057548cf9b2a14a",
+                "url": "https://api.github.com/repos/thephpleague/flysystem/zipball/f3ad69181b8afed2c9edf7be5a2918144ff4ea32",
+                "reference": "f3ad69181b8afed2c9edf7be5a2918144ff4ea32",
                 "shasum": ""
             },
             "require": {
@@ -2798,7 +2856,6 @@
                 "phpunit/phpunit": "^8.5.8"
             },
             "suggest": {
-                "ext-fileinfo": "Required for MimeType",
                 "ext-ftp": "Allows you to use FTP server storage",
                 "ext-openssl": "Allows you to use FTPS server storage",
                 "league/flysystem-aws-s3-v2": "Allows you to use S3 storage with AWS SDK v2",
@@ -2854,7 +2911,7 @@
                 "sftp",
                 "storage"
             ],
-            "time": "2020-08-23T07:39:11+00:00"
+            "time": "2021-06-23T21:56:05+00:00"
         },
         {
             "name": "league/flysystem-aws-s3-v3",
@@ -3085,16 +3142,16 @@
         },
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