diff --git a/.drone.yml b/.drone.yml
index 53be71e317..257fe23d7d 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -11,4 +11,53 @@ steps:
   - name: Check default
     image: friendicaci/transifex
     commands:
-      - /check-messages.sh
\ No newline at end of file
+      - /check-messages.sh
+---
+kind: pipeline
+type: docker
+name: php7.3-lint
+
+steps:
+  - name: Test
+    image: php:7.3
+    commands:
+      - ./bin/composer.phar run lint
+---
+kind: pipeline
+type: docker
+name: php7.4-lint
+
+steps:
+  - name: Test
+    image: php:7.4
+    commands:
+      - ./bin/composer.phar run lint
+---
+kind: pipeline
+type: docker
+name: php8.0-lint
+
+steps:
+  - name: Test
+    image: php:8.0
+    commands:
+      - ./bin/composer.phar run lint
+---
+kind: pipeline
+type: docker
+name: php-cs check
+
+trigger:
+  event:
+    - pull_request
+
+steps:
+  - name: Install dependencies
+    image: composer
+    commands:
+      - ./bin/composer.phar run cs:install
+  - name: Run coding standards check
+    image: friendicaci/php-cs
+    commands:
+      - export CHANGED_FILES="$(git diff --name-status ${DRONE_COMMIT_BEFORE}..${DRONE_COMMIT_AFTER} | grep ^A | cut -f2)"
+      - /check-php-cs.sh
diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
deleted file mode 100644
index 72f53c901f..0000000000
--- a/.github/workflows/lint.yml
+++ /dev/null
@@ -1,42 +0,0 @@
-name: Lint
-on: pull_request
-
-jobs:
-  php-linters:
-    name: php${{ matrix.php-versions }} lint
-    runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        php-versions: ['7.3', '7.4', '8.0']
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v2
-      - name: Set up php${{ matrix.php-versions }}
-        uses: shivammathur/setup-php@master
-        with:
-          php-version: ${{ matrix.php-versions }}
-          coverage: none
-      - name: Lint
-        run: bin/composer.phar run lint
-
-  php-cs-fixer:
-    name: php-cs check
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v2
-      - name: Get changed files
-        id: changes
-        uses: jitterbit/get-changed-files@v1
-      - name: Set up php
-        uses: shivammathur/setup-php@master
-        with:
-          php-version: 7.2
-          coverage: none
-      - name: Install dependencies
-        run: bin/composer.phar run cs:install
-      - name: Run coding standards check
-        run: |
-          if ! echo "${{ steps.changes.outputs.added }}" | grep -qE "^(\\.php_cs(\\.dist)?|composer\\.lock)$"; then EXTRA_ARGS=$(printf -- '--path-mode=intersection\n--\n%s' "${{ steps.changes.outputs.added }}"); else EXTRA_ARGS=''; fi
-          bin/dev/php-cs-fixer/vendor/bin/php-cs-fixer fix --config=.php_cs.dist -v --diff --diff-format=udiff --dry-run --stop-on-violation --using-cache=no ${EXTRA_ARGS}
-        shell: bash
\ No newline at end of file
diff --git a/src/Protocol/DFRN.php b/src/Protocol/DFRN.php
index a24fbaa033..2cb83627ac 100644
--- a/src/Protocol/DFRN.php
+++ b/src/Protocol/DFRN.php
@@ -1441,19 +1441,19 @@ class DFRN
 	/**
 	 * Fetch the author data from head or entry items
 	 *
-	 * @param object $xpath     XPath object
-	 * @param object $context   In which context should the data be searched
-	 * @param array  $importer  Record of the importer user mixed with contact of the content
-	 * @param string $element   Element name from which the data is fetched
-	 * @param bool   $onlyfetch Should the data only be fetched or should it update the contact record as well
-	 * @param string $xml       optional, default empty
+	 * @param \DOMXPath $xpath     XPath object
+	 * @param \DOMNode  $context   In which context should the data be searched
+	 * @param array     $importer  Record of the importer user mixed with contact of the content
+	 * @param string    $element   Element name from which the data is fetched
+	 * @param bool      $onlyfetch Should the data only be fetched or should it update the contact record as well
+	 * @param string    $xml       optional, default empty
 	 *
 	 * @return array Relevant data of the author
 	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 	 * @throws \ImagickException
 	 * @todo  Find good type-hints for all parameter
 	 */
-	private static function fetchauthor($xpath, $context, $importer, $element, $onlyfetch, $xml = "")
+	private static function fetchauthor(\DOMXPath $xpath, \DOMNode $context, $importer, $element, $onlyfetch, $xml = "")
 	{
 		$author = [];
 		$author["name"] = XML::getFirstNodeValue($xpath, $element."/atom:name/text()", $context);
@@ -1609,12 +1609,14 @@ class DFRN
 			}
 
 			// "dfrn:birthday" contains the birthday converted to UTC
-			$birthday = XML::getFirstNodeValue($xpath, $element . "/poco:birthday/text()", $context);
-
-			if (strtotime($birthday) > time()) {
-				$bd_timestamp = strtotime($birthday);
-
-				$poco["bdyear"] = date("Y", $bd_timestamp);
+			$birthday = XML::getFirstNodeValue($xpath, $element . "/dfrn:birthday/text()", $context);
+			try {
+				$birthday_date = new \DateTime($birthday);
+				if ($birthday_date > new \DateTime()) {
+					$poco["bdyear"] = $birthday_date->format("Y");
+				}
+			} catch (\Exception $e) {
+				// Invalid birthday
 			}
 
 			// "poco:birthday" is the birthday in the format "yyyy-mm-dd"