diff --git a/src/Entity/ActivityEntity.php b/src/Entity/ActivityEntity.php
new file mode 100644
index 0000000..276ca4f
--- /dev/null
+++ b/src/Entity/ActivityEntity.php
@@ -0,0 +1,208 @@
+<?php
+namespace App\Entity;
+
+use App\Helper\StringGenerationHelper;
+use DateTime;
+
+/**
+ * Entity for activities
+ */
+class ActivityEntity
+{
+
+    /** @var string The unique identifier of the entity */
+    protected $id = '';
+
+    /** @var string The name of the activity */
+    protected $name = '';
+
+    /** @var DateTime|NULL The scheduled start date */
+    protected $startDate = null;
+
+    /** @var DateTime|NULL The scheduled end date */
+    protected $endDate = null;
+
+    /** @var DateTime|NULL The effective start date */
+    protected $realStartDate = null;
+
+    /** @var DateTime|NULL The effective end date */
+    protected $realEndDate = null;
+
+    /** @var ActorEntity|NULL The actor of the activity */
+    protected $actor = null;
+
+    /**
+     * Get the unique ID the entity
+     *
+     * @return string
+     */
+    public function getId(): string
+    {
+        return $this->id;
+    }
+
+    /**
+     * Set the ID of the entity
+     * <br/> This should not be done after creation
+     *
+     * @param string $id
+     * @return self
+     */
+    public function setId(string $id): self
+    {
+        $this->id = $id;
+
+        return $this;
+    }
+
+    /**
+     * Generate and save a random ID
+     *
+     * @return string Generated ID
+     */
+    public function generateId(): string
+    {
+        // Generate ID
+        $id = StringGenerationHelper::generateString(array_merge(range('a', 'z'), range('A', 'Z'), range('0', '9')), 8);
+
+        // Save and return
+        $this->setId($id);
+        return $id;
+    }
+
+    /**
+     * Get the activity name
+     *
+     * @return string
+     */
+    public function getName(): string
+    {
+        return $this->name;
+    }
+
+    /**
+     * Set a new name for the activity
+     *
+     * @param string $name
+     * @return self
+     */
+    public function setName(string $name): self
+    {
+        $this->name = $name;
+
+        return $this;
+    }
+
+    /**
+     * Get the scheduled start date
+     *
+     * @return DateTime|NULL
+     */
+    public function getStartDate(): ?DateTime
+    {
+        return $this->startDate;
+    }
+
+    /**
+     * Set a new scheduled start date
+     *
+     * @param DateTime|NULL $startDate
+     * @return self
+     */
+    public function setStartDate(?DateTime $startDate): self
+    {
+        $this->startDate = $startDate;
+
+        return $this;
+    }
+
+    /**
+     * Get the scheduled end date
+     *
+     * @return DateTime|NULL
+     */
+    public function getEndDate(): ?DateTime
+    {
+        return $this->endDate;
+    }
+
+    /**
+     * Set the new schedules end date
+     *
+     * @param DateTime|NULL $endDate
+     * @return self
+     */
+    public function setEndDate(?DateTime $endDate): self
+    {
+        $this->endDate = $endDate;
+
+        return $this;
+    }
+
+    /**
+     * Get the effectiv start date
+     *
+     * @return DateTime|NULL
+     */
+    public function getRealStartDate(): ?DateTime
+    {
+        return $this->realStartDate;
+    }
+
+    /**
+     * Set the new effective start date
+     *
+     * @param DateTime|NULL $realStartDate
+     * @return self
+     */
+    public function setRealStartDate(?DateTime $realStartDate): self
+    {
+        $this->realStartDate = $realStartDate;
+
+        return $this;
+    }
+
+    /**
+     * Get the effective end date
+     *
+     * @return DateTime|NULL
+     */
+    public function getRealEndDate(): ?DateTime
+    {
+        return $this->realEndDate;
+    }
+
+    /**
+     * Set the new effective end date
+     *
+     * @param DateTime|NULL $realEndDate
+     * @return self
+     */
+    public function setRealEndDate(?DateTime $realEndDate): self
+    {
+        $this->realEndDate = $realEndDate;
+    }
+
+    /**
+     * Get the related actor
+     *
+     * @return ActorEntity|NULL
+     */
+    public function getActor(): ?ActorEntity
+    {
+        return $this->actor;
+    }
+
+    /**
+     * Set the new related actor
+     *
+     * @param ActorEntity|NULL $actor
+     * @return self
+     */
+    public function setActor(?ActorEntity $actor): self
+    {
+        $this->actor = $actor;
+
+        return $this;
+    }
+}
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