diff --git a/includes/collection/class-followers.php b/includes/collection/class-followers.php
index 0948bfb..413af3b 100644
--- a/includes/collection/class-followers.php
+++ b/includes/collection/class-followers.php
@@ -143,7 +143,7 @@ class Followers {
 				'single'            => true,
 				'sanitize_callback' => function( $value ) {
 					if ( ! is_numeric( $value ) && (int) $value !== $value ) {
-						$value = strtotime( 'now' );
+						$value = \time();
 					}
 
 					return $value;
diff --git a/includes/model/class-activity.php b/includes/model/class-activity.php
index 34f6146..6a8d45a 100644
--- a/includes/model/class-activity.php
+++ b/includes/model/class-activity.php
@@ -44,7 +44,7 @@ class Activity {
 		}
 
 		$this->type = \ucfirst( $type );
-		$this->published = \gmdate( 'Y-m-d\TH:i:s\Z', \strtotime( 'now' ) );
+		$this->published = \gmdate( 'Y-m-d\TH:i:s\Z', \time() );
 	}
 
 	public function __call( $method, $params ) {
diff --git a/includes/model/class-follower.php b/includes/model/class-follower.php
index 10200c2..0668e4d 100644
--- a/includes/model/class-follower.php
+++ b/includes/model/class-follower.php
@@ -185,7 +185,7 @@ class Follower {
 			$this->shared_inbox = $meta['inbox'];
 		}
 
-		$this->updated_at = \strtotime( 'now' );
+		$this->updated_at = \time();
 	}
 
 	/**
@@ -320,7 +320,7 @@ class Follower {
 			)
 		);
 
-		$this->updated_at = \strtotime( 'now' );
+		$this->updated_at = \time();
 		$this->update_term_meta();
 	}
 
diff --git a/tests/test-class-db-activitypub-followers.php b/tests/test-class-db-activitypub-followers.php
index cf8b53f..2467363 100644
--- a/tests/test-class-db-activitypub-followers.php
+++ b/tests/test-class-db-activitypub-followers.php
@@ -102,7 +102,7 @@ class Test_Db_Activitypub_Followers extends WP_UnitTestCase {
 
 		$follower = new \Activitypub\Model\Follower( 'https://example.com/author/jon' );
 
-		update_term_meta( $follower->get_id(), 'updated_at', strtotime( 'now' ) - 804800 );
+		update_term_meta( $follower->get_id(), 'updated_at', \time() - 804800 );
 
 		$followers = \Activitypub\Collection\Followers::get_outdated_followers();
 		$this->assertEquals( 1, count( $followers ) );