diff --git a/snapporder/activate.php b/snapporder/activate.php
index dff0210..2b4863f 100644
--- a/snapporder/activate.php
+++ b/snapporder/activate.php
@@ -121,7 +121,6 @@ if( isset($_POST['submit']) ) {
             <!-- Account -->
             <label for="id_username">Brukernavn:</label><input id="id_username" type="text" name="username" placeholder="Brukernavn" value="<?php echo $username; ?>" />
             <label for="id_password">Passord:</label><input id="id_password" type="password" name="password" placeholder="Passord" value="<?php echo $password; ?>"/>
-            <label for="id_date_of_birth_day">Fødselsdato:</label><?php date_picker("id_date_of_birth"); ?>
             <label for="id_place_of_study">Studiested:</label><?php institutions(); ?>
             <label for="id_newsletter">Motta nyhetsbrev:</label><input type="checkbox" id="id_newsletter" name="newsletter" value="1"<?php echo $newsletter_checked; ?> /> Nyheter og kommende arrangementer på Studentersamfundet<br /><br />
             <button type="submit" name="submit" class="btn-submit">Aktiver medlemskapet</button>
diff --git a/snapporder/api/query.php b/snapporder/api/query.php
index e3e03eb..b10ce0b 100644
--- a/snapporder/api/query.php
+++ b/snapporder/api/query.php
@@ -17,6 +17,7 @@
  *   "firstname": "Jon",
  *   "lastname": "Hansen",
  *   "email": "jon@uio.no",
+ *   "birthdate": "1985-03-01",
  *   "registration_status": "partial" // "partial" means show link
  *   "registration_url": "/snapporder/register_partial.php?userid=4331&token=lol"
  * }
diff --git a/snapporder/api/register.php b/snapporder/api/register.php
index 009cc3c..656c743 100644
--- a/snapporder/api/register.php
+++ b/snapporder/api/register.php
@@ -10,6 +10,7 @@
  *   "firstname": "Jon",
  *   "lastname": "Hansen",
  *   "email": "jon@uio.no",
+ *   "birthdate": "1985-03-01"  // format: ISO-8601 date
  *   "purchased": "2004-02-12"  // optional, format: ISO-8601 date
  * }
  *
@@ -23,6 +24,7 @@
  *   "firstname": "Jon",
  *   "lastname": "Hansen",
  *   "email": "jon@uio.no",
+ *   "birthdate": "1985-03-01",
  *   "registration_status": "partial"  // "partial" means show link
  *   "registration_url": "/snapporder/register_partial.php?userid=4331&token=lol"
  * }
@@ -62,7 +64,7 @@ if($data === NULL) {
 }
 
 /* Validate supplied data */
-$required_keys = array('firstname', 'lastname', 'phone', 'email');
+$required_keys = array('firstname', 'lastname', 'phone', 'email', 'birthdate');
 $valid_keys = $required_keys;
 $valid_keys[] = + 'purchased';
 
@@ -127,6 +129,12 @@ if( strlen($data['lastname']) < 2) {
     echo json_encode(array('error' => 'Too short lastname: '.$data['lastname']));
     die();
 }
+/* validate birthdate */
+if( !valid_date($data['birthdate']) ) {
+    set_response_code(400);
+    echo json_encode(array('error' => 'Could not parse birthdate: \''.$data['birthdate'].'\''));
+    die();
+}
 
 /* Validate optional purchase_date */
 if( isset($data['purchased']) ) {
diff --git a/snapporder/lib/functions.php b/snapporder/lib/functions.php
index 8a2aaf8..1f6f1cf 100644
--- a/snapporder/lib/functions.php
+++ b/snapporder/lib/functions.php
@@ -78,7 +78,7 @@ function get_user($user_id) {
      *  - a date >= NOW(): Valid membership
      *  - NULL: Lifelong membership
      */
-    $cols = array('id', 'firstname', 'lastname', 'email', 'expires', 'cardno', 'registration_status');
+    $cols = array('id', 'firstname', 'lastname', 'email', 'expires', 'cardno', 'registration_status', 'birthdate');
     $sql_group_ids = "GROUP_CONCAT(group_id) AS group_ids";
     $sql_is_member = "expires > NOW() OR expires IS NULL AS is_member";
     $sql = "SELECT ".implode($cols, ",").",$sql_group_ids,$sql_is_member FROM din_user AS users LEFT JOIN din_usergrouprelationship AS ug ON users.id=ug.user_id WHERE users.id=$user_id GROUP BY users.id";
@@ -115,6 +115,9 @@ function get_user($user_id) {
     unset($user['group_ids']);
     $user['memberid'] = $user['id']; // rename
     unset($user['id']);
+    if($user['birthdate'] == "0000-00-00") {
+        unset($user['birthdate']);
+    }
 
     return $user;
 }
@@ -310,15 +313,10 @@ function mailchimp_subscribe($data, $list_id, $api_key) {
 function update_user($data) {
     global $conn;
 
-    $birthdate_sql = "";
-    if( strlen($data['date_of_birth']) > 0) {
-        $birthdate_sql = "birthdate=" .$conn->quoteSmart($data['date_of_birth']).",";
-    }
     // user: update existing user, activation_status="full", form data
     $sql = "UPDATE din_user SET ";
     $sql .= "username=" .$conn->quoteSmart($data['username']).",";
     $sql .= "password=PASSWORD(" .$conn->quoteSmart($data['password'])."),";
-    $sql .= $birthdate_sql;
     $sql .= "placeOfStudy=" .$conn->quoteSmart($data['place_of_study']).",";
     $sql .= "registration_status='full'";
     $sql .= " WHERE id = " . $conn->quoteSmart($data['userid']);
@@ -347,25 +345,8 @@ function update_user_groups($data) {
     return true;
 }
 
-function validate_date_of_birth($data, $optional=true) {
-    $keys = array('year', 'month','day');
-    $values = array();
-
-    foreach( $keys as $key) {
-        // If started filling out date of birth
-        if(strlen($data[$key]) !== 0) {
-            $optional = false;
-        }
-        // year
-        $values[] = $data[$key];
-    }
-
-    if($optional) {
-        return ""; // skip
-    }
-
+function valid_date($date) {
     // try parsing
-    $date = implode('-', $values);
     if(!clean_date($date)) {
         return false;
     }
@@ -395,13 +376,6 @@ function validate_activation_form($data) {
         throw new ValidationException("Passordet kan ikke inneholde enkel- eller dobbelfnutt eller bakslask.");
     }
 
-    // birthdate (optional)
-    $valid_date = validate_date_of_birth($data);
-    if( $valid_date === false ) {
-        throw new ValidationException("Ugyldig fødselsdato");
-    }
-    $data['date_of_birth'] = $valid_date; // Note: could be: ""
-
     // place of study (optional)
     if( !is_numeric($data['place_of_study']) ) {
         throw new ValidationException("Ugyldig studiested");
diff --git a/snapporder/tests/testuser.json b/snapporder/tests/testuser.json
index 7b115be..db3b02a 100644
--- a/snapporder/tests/testuser.json
+++ b/snapporder/tests/testuser.json
@@ -1,6 +1,7 @@
 {
     "firstname": "Test",
     "lastname": "Testesen",
-    "email": "aaaadadfz@aaa222asd333a44zz.com",
-    "phone": "+4745115788"
+    "email": "aaaadadfz@aaa422asd333a44zz.com",
+    "birthdate": "1985-02-05",
+    "phone": "+4745115784"
 }