diff --git a/src/DataTypes/Calendar.php b/src/DataTypes/Calendar.php
new file mode 100644
index 0000000..4682d11
--- /dev/null
+++ b/src/DataTypes/Calendar.php
@@ -0,0 +1,413 @@
+<?php
+
+namespace SimpleSoftwareIO\QrCode\DataTypes;
+
+use BaconQrCode\Exception\InvalidArgumentException;
+use DateTime;
+use DateTimeZone;
+use Exception;
+
+class Calendar implements DataTypeInterface
+{
+    /**
+     * The prefix of the QrCode.
+     *
+     * @var string
+     */
+    protected $prefix = 'BEGIN:VEVENT';
+
+    /**
+     * The suffix of the QrCode.
+     *
+     * @var string
+     */
+    protected $suffix = 'END:VEVENT';
+
+    /**
+     * The separator between the variables.
+     *
+     * @var string
+     */
+    protected $separator = "\r\n";
+
+    /**
+     * The summary of the event.
+     *
+     * @var string
+     */
+    protected $summary;
+
+    /**
+     * The location of the event.
+     *
+     * @var string
+     */
+    protected $location;
+
+    /**
+     * The url of the event.
+     *
+     * @var string
+     */
+    protected $url;
+
+    /**
+     * The start time of the event.
+     * e.g 2020-05-23 15:00.
+     *
+     * @var string
+     */
+    protected $startDateTime;
+
+    /**
+     * The end time of the event.
+     * e.g 2020-05-24 15:00.
+     *
+     * @var string
+     */
+    protected $endDateTime;
+
+    /**
+     * Start/End date timezone.
+     * e.g 'Africa/Douala'.
+     *
+     * @var string
+     */
+    protected $timezone;
+
+    /**
+     * The standard format for the [$statDateTime] and [$endDateTime].
+     * Gets overridden if user specifies their own formats [$dateTimeFormat].
+     *
+     * @var string
+     */
+    protected $dateTimeFormat = 'Y-m-d H:i';
+
+    /**
+     * Event full descriptions/notes.
+     *
+     * @var string
+     */
+    protected $description;
+
+    /**
+     * Event categories.
+     *
+     * @var array
+     */
+    protected $categories;
+
+    /**
+     * Alarm/Reminder. Trigger's before/after event.
+     *
+     * @var array
+     */
+    protected $alarm;
+
+    /**
+     * Generates the DataType Object and sets all of its properties.
+     *
+     * @param $arguments
+     */
+    public function create(array $arguments)
+    {
+        $this->setProperties($arguments);
+    }
+
+    /**
+     * Returns the correct QrCode format.
+     *
+     * @return string
+     */
+    public function __toString()
+    {
+        return $this->buildCalendarString();
+    }
+
+    /**
+     * Builds the WiFi string.
+     *
+     * @return string
+     */
+    protected function buildCalendarString()
+    {
+        $calendar = $this->prefix.$this->separator;
+
+        if (isset($this->summary)) {
+            $calendar .= 'SUMMARY:'.$this->summary.$this->separator;
+        }
+        if (isset($this->startDateTime)) {
+            $calendar .= 'DTSTART';
+            if (isset($this->timezone)) {
+                $calendar .= $this->timezone;
+            }
+            $calendar .= ':'.$this->startDateTime.$this->separator;
+        }
+        if (isset($this->endDateTime)) {
+            $calendar .= 'DTEND';
+            if (isset($this->timezone)) {
+                $calendar .= $this->timezone;
+            }
+            $calendar .= ':'.$this->endDateTime.$this->separator;
+        }
+        if (isset($this->location)) {
+            $calendar .= 'LOCATION:'.$this->location.$this->separator;
+        }
+        if (isset($this->url)) {
+            $calendar .= 'URL:'.$this->url.$this->separator;
+        }
+        if (isset($this->description)) {
+            $calendar .= 'DESCRIPTION:'.$this->description.$this->separator;
+        }
+        if (isset($this->categories)) {
+            $calendar .= 'CATEGORIES:'.$this->categories.$this->separator;
+        }
+        if (isset($this->alarm)) {
+            $calendar .= $this->alarm;
+        }
+
+        $calendar .= $this->suffix;
+
+        return $calendar;
+    }
+
+    /**
+     * Sets the Calendar properties.
+     *
+     * @param $arguments
+     */
+    protected function setProperties(array $arguments)
+    {
+        $arguments = $arguments[0];
+        if (! isset($arguments['summary'])) {
+            throw new InvalidArgumentException('Please provide an event summary.');
+        } elseif (! isset($arguments['startDateTime'])) {
+            throw new InvalidArgumentException('Please provide a start date for the event.');
+        } else {
+            if (isset($arguments['dateTimeFormat'])) {
+                $this->dateTimeFormat = $arguments['dateTimeFormat'];
+            }
+            if (isset($arguments['timezone'])) {
+                $this->setEventTimeZone($arguments['timezone']);
+            }
+
+            $this->summary = $arguments['summary'];
+            $this->setEventDateTime($arguments['startDateTime'], 'start');
+
+            if (isset($arguments['endDateTime'])) {
+                $this->setEventDateTime($arguments['endDateTime'], 'end');
+            }
+            if (isset($arguments['location'])) {
+                $this->location = $arguments['location'];
+            }
+            if (isset($arguments['url'])) {
+                $this->setUrl($arguments['url']);
+            }
+            if (isset($arguments['description'])) {
+                $this->description = $arguments['description'];
+            }
+            if (isset($arguments['categories'])) {
+                $this->setCategories($arguments['categories']);
+            }
+            if (isset($arguments['alarm'])) {
+                $this->setAlarm($arguments['alarm']);
+            }
+        }
+    }
+
+    /**
+     * Sets the url property.
+     *
+     * @param $url
+     */
+    protected function setUrl($url)
+    {
+        if ($this->isValidUrl($url)) {
+            $this->url = $url;
+        }
+    }
+
+    /**
+     * Sets the datetime property.
+     *
+     * @param string $eventDateTime
+     * @param string $type
+     */
+    protected function setEventDateTime($eventDateTime, $type = '')
+    {
+        if ($this->isValidDateTime($eventDateTime, $type)) {
+            if ($type == 'start') {
+                $this->startDateTime = $this->convertEventDateTimeToString($eventDateTime);
+            }
+            if ($type == 'end') {
+                $this->endDateTime = $this->convertEventDateTimeToString($eventDateTime);
+            }
+        }
+    }
+
+    /**
+     * Ensures url is valid.
+     *
+     * @param string $url
+     *
+     * @return bool
+     */
+    protected function isValidUrl($url)
+    {
+        if (! filter_var($url, FILTER_VALIDATE_URL)) {
+            throw new InvalidArgumentException('Invalid url provided');
+        }
+
+        return true;
+    }
+
+    /**
+     * Ensures datetime is valid.
+     *
+     * @param string $dateTime
+     * @param string $type
+     *
+     * @return bool
+     */
+    protected function isValidDateTime($dateTime, $type = '')
+    {
+        $newDate = DateTime::createFromFormat($this->dateTimeFormat, $dateTime);
+        if (! ($newDate && $newDate->format($this->dateTimeFormat) == $dateTime)) {
+            if ($type == 'start') {
+                throw new InvalidArgumentException('Invalid start date provided. Date must be of format '.
+                    $this->dateTimeFormat);
+            }
+            if ($type == 'end') {
+                throw new InvalidArgumentException('Invalid end date provided. Date must be of format '.
+                    $this->dateTimeFormat);
+            }
+            throw new InvalidArgumentException('Invalid date provided. Date must be of format '.
+                $this->dateTimeFormat);
+        }
+
+        return true;
+    }
+
+    /**
+     * Returns correct date time to string.
+     *
+     * @param string $dateTime
+     * @return string
+     */
+    protected function convertEventDateTimeToString($dateTime)
+    {
+        try {
+            $date = new DateTime($dateTime);
+        } catch (Exception $e) {
+            throw new InvalidArgumentException('Invalid date provided');
+        }
+
+        return $date->format('yymd\THms');
+    }
+
+    /**
+     * Ensures timezone string is valid. ('Africa/Douala').
+     *
+     * @param string $timezone
+     *
+     * @return bool
+     */
+    protected function isValidTimeZone($timezone)
+    {
+        if (! in_array($timezone, DateTimeZone::listIdentifiers())) {
+            throw new InvalidArgumentException('Invalid timezone provided.');
+        }
+
+        return true;
+    }
+
+    /**
+     * Sets the timezone property.
+     *
+     * @param $timezone
+     */
+    protected function setEventTimeZone($timezone)
+    {
+        if ($this->isValidTimeZone($timezone)) {
+            $this->timezone = ';TZID='.$timezone;
+        }
+    }
+
+    /**
+     * Sets the alarm property.
+     *
+     * @param array $alarm
+     */
+    protected function setAlarm($alarm)
+    {
+        if (is_array($alarm)) {
+            $alarmString = 'BEGIN:VALARM'.$this->separator;
+            $alarmString .= 'ACTION:DISPLAY'.$this->separator;
+            $alarmString .= $this->keyExists('repeat', $alarm) ?
+                'REPEAT:'.$alarm['repeat'].$this->separator : '';
+            $alarmString .= $this->keyExists('summary', $alarm) ?
+                'SUMMARY:'.$alarm['summary'].$this->separator : '';
+            $alarmString .= $this->keyExists('description', $alarm) ?
+                'DESCRIPTION:'.$alarm['description'].$this->separator : '';
+            if ($this->keyExists('trigger', $alarm) && is_array($alarm['trigger'])) {
+                $alarmString .= $this->setAlarmTrigger($alarm['trigger']).$this->separator;
+            }
+            $alarmString .= 'END:VALARM'.$this->separator;
+            $this->alarm = $alarmString;
+        } else {
+            throw new InvalidArgumentException('Invalid alarm provided.');
+        }
+    }
+
+    /**
+     * Sets the alarm trigger property.
+     *
+     * @param array $alarm
+     * @return string
+     */
+    protected function setAlarmTrigger($alarm)
+    {
+        if (is_array($alarm)) {
+            $alarmString = 'TRIGGER:';
+            $alarmString .= $this->keyExists('before', $alarm) ? $alarm['before'] ? '-' : '' : '';
+            $alarmString .= 'P';
+            $alarmString .= $this->keyExists('weeks', $alarm) ? $alarm['weeks'].'W' : '';
+            $alarmString .= $this->keyExists('days', $alarm) ? $alarm['days'].'D' : '';
+            $alarmString .= 'T';
+            $alarmString .= $this->keyExists('hours', $alarm) ? $alarm['hours'].'H' : '';
+            $alarmString .= $this->keyExists('minutes', $alarm) ? $alarm['minutes'].'M' : '';
+            $alarmString .= $this->keyExists('seconds', $alarm) ? $alarm['seconds'].'S' : '';
+
+            return $alarmString;
+        } else {
+            throw new InvalidArgumentException('Invalid alarm duration provided.');
+        }
+    }
+
+    /**
+     * Sets the event categories property.
+     *
+     * @param array $categories
+     */
+    protected function setCategories($categories)
+    {
+        if (is_array($categories)) {
+            $this->categories = implode(',', $categories);
+        } else {
+            throw new InvalidArgumentException('Invalid categories provided.');
+        }
+    }
+
+    /**
+     * Checks if key exists in array.
+     *
+     * @param string $key
+     * @param array $array
+     *
+     * @return bool
+     */
+    protected function keyExists($key, $array)
+    {
+        return array_key_exists($key, $array);
+    }
+}
diff --git a/tests/DataTypes/CalendarTest.php b/tests/DataTypes/CalendarTest.php
new file mode 100644
index 0000000..8f7890d
--- /dev/null
+++ b/tests/DataTypes/CalendarTest.php
@@ -0,0 +1,213 @@
+<?php
+
+namespace DataTypes;
+
+use BaconQrCode\Exception\InvalidArgumentException;
+use PHPUnit\Framework\TestCase;
+use SimpleSoftwareIO\QrCode\DataTypes\Calendar;
+
+class CalendarTest extends TestCase
+{
+    /**
+     * The separator between the variables.
+     *
+     * @var string
+     */
+    private $separator;
+
+    /**
+     * The calendar variable.
+     *
+     * @var Calendar
+     */
+    private $calendar;
+
+    public function setUp(): void
+    {
+        $this->separator = "\r\n";
+        $this->calendar = new Calendar();
+    }
+
+    public function test_summary_is_mandatory()
+    {
+        $this->expectException(InvalidArgumentException::class);
+        $this->calendar->create([
+            0 => [
+                'startDateTime' => '2020-04-15 14:00',
+            ],
+        ]);
+    }
+
+    public function test_start_date_time_is_mandatory()
+    {
+        $exceptionOccurred = false;
+        try {
+            $this->calendar->create([
+                0 => [
+                    'summary' => 'My FooBar Event',
+                ],
+            ]);
+        } catch (InvalidArgumentException $e) {
+            $exceptionOccurred = true;
+            $this->assertEquals($e->getMessage(), 'Please provide a start date for the event.');
+        }
+
+        $this->assertTrue($exceptionOccurred);
+    }
+
+    public function test_it_generates_a_proper_format_with_just_the_summary_and_start_date_time()
+    {
+        $this->calendar->create([
+            0 => [
+                'summary' => 'My FooBar Event',
+                'startDateTime' => '2020-10-08 16:00',
+            ],
+        ]);
+
+        $properFormat = 'BEGIN:VEVENT'.$this->separator.
+                        'SUMMARY:My FooBar Event'.$this->separator.
+                        'DTSTART:20201008T161000'.$this->separator.
+                        'END:VEVENT';
+
+        $this->assertEquals($properFormat, strval($this->calendar));
+    }
+
+    public function test_it_generates_a_proper_format_with_summary_start_date_time_and_end_date_time()
+    {
+        $this->calendar->create([
+            0 => [
+                'summary' => 'My FooBar Event',
+                'startDateTime' => '2020-10-08 16:00',
+                'endDateTime' => '2020-10-08 18:00',
+            ],
+        ]);
+
+        $properFormat = 'BEGIN:VEVENT'.$this->separator.
+            'SUMMARY:My FooBar Event'.$this->separator.
+            'DTSTART:20201008T161000'.$this->separator.
+            'DTEND:20201008T181000'.$this->separator.
+            'END:VEVENT';
+
+        $this->assertEquals($properFormat, strval($this->calendar));
+    }
+
+    public function test_it_generates_a_proper_format_with_specified_date_time_format()
+    {
+        $this->calendar->create([
+            0 => [
+                'summary' => 'My FooBar Event',
+                'startDateTime' => '2020-10-08 16:00',
+                'endDateTime' => '2020-10-08 18:00',
+                'dateTimeFormat' => 'Y-m-d H:i',
+            ],
+        ]);
+
+        $properFormat = 'BEGIN:VEVENT'.$this->separator.
+            'SUMMARY:My FooBar Event'.$this->separator.
+            'DTSTART:20201008T161000'.$this->separator.
+            'DTEND:20201008T181000'.$this->separator.
+            'END:VEVENT';
+
+        $this->assertEquals($properFormat, strval($this->calendar));
+    }
+
+    public function test_date_time_format_validation()
+    {
+        $this->expectException(InvalidArgumentException::class);
+        $this->calendar->create([
+            0 => [
+                'summary' => 'My FooBar Event',
+                'startDateTime' => '2020-10-08 16:00',
+                'endDateTime' => '2020-10-08 18:00',
+                'dateTimeFormat' => 'Y/m/d H:i',
+            ],
+        ]);
+    }
+
+    public function test_it_generates_a_proper_format_with_summary_start_date_time_and_just_location()
+    {
+        $this->calendar->create([
+            0 => [
+                'summary' => 'My FooBar Event',
+                'startDateTime' => '2020-10-08 16:00',
+                'location' => 'Fooon',
+            ],
+        ]);
+
+        $properFormat = 'BEGIN:VEVENT'.$this->separator.
+            'SUMMARY:My FooBar Event'.$this->separator.
+            'DTSTART:20201008T161000'.$this->separator.
+            'LOCATION:Fooon'.$this->separator.
+            'END:VEVENT';
+
+        $this->assertEquals($properFormat, strval($this->calendar));
+    }
+
+    public function test_it_generates_a_proper_format_with_summary_start_date_time_and_just_url()
+    {
+        $this->calendar->create([
+            0 => [
+                'summary' => 'My FooBar Event',
+                'startDateTime' => '2020-10-08 16:00',
+                'url' => 'https://www.google.com',
+            ],
+        ]);
+
+        $properFormat = 'BEGIN:VEVENT'.$this->separator.
+            'SUMMARY:My FooBar Event'.$this->separator.
+            'DTSTART:20201008T161000'.$this->separator.
+            'URL:https://www.google.com'.$this->separator.
+            'END:VEVENT';
+
+        $this->assertEquals($properFormat, strval($this->calendar));
+    }
+
+    public function test_it_generates_a_proper_format_with_calendar_parameters()
+    {
+        $this->calendar->create([
+            0 => [
+                'summary' => 'My FooBar Event',
+                'startDateTime' => '2020-10-08 16:00',
+                'endDateTime' => '2020-10-08 18:00',
+                'location' => 'Foo Location',
+                'timezone' => 'Africa/Douala',
+                'url' => 'https://www.google.com',
+                'categories' => ['Business', 'Anniversary', 'Special'],
+                'dateTimeFormat' => 'Y-m-d H:i',
+                'description' => 'FooBar\'s Event description can be longer than this',
+                'alarm' => [
+                    'trigger' => [
+                        'weeks' => 1,
+                        'days' => 2,
+                        'hours' => 3,
+                        'minutes' => 20,
+                        'seconds' => 0,
+                        'before' => true,
+                    ],
+                    'repeat' => 2,
+                    'summary' => 'Alarm Summary',
+                    'description' => 'Alarm Description can be longer',
+                ],
+            ],
+        ]);
+
+        $properFormat = 'BEGIN:VEVENT'.$this->separator.
+            'SUMMARY:My FooBar Event'.$this->separator.
+            'DTSTART;TZID=Africa/Douala:20201008T161000'.$this->separator.
+            'DTEND;TZID=Africa/Douala:20201008T181000'.$this->separator.
+            'LOCATION:Foo Location'.$this->separator.
+            'URL:https://www.google.com'.$this->separator.
+            'DESCRIPTION:FooBar\'s Event description can be longer than this'.$this->separator.
+            'CATEGORIES:Business,Anniversary,Special'.$this->separator.
+            'BEGIN:VALARM'.$this->separator.
+            'ACTION:DISPLAY'.$this->separator.
+            'REPEAT:2'.$this->separator.
+            'SUMMARY:Alarm Summary'.$this->separator.
+            'DESCRIPTION:Alarm Description can be longer'.$this->separator.
+            'TRIGGER:-P1W2DT3H20M0S'.$this->separator.
+            'END:VALARM'.$this->separator.
+            'END:VEVENT';
+
+        $this->assertEquals($properFormat, strval($this->calendar));
+    }
+}