diff --git a/src/Core/Cache/Type/DatabaseCache.php b/src/Core/Cache/Type/DatabaseCache.php
index ef6a30afeb..55282a73e7 100644
--- a/src/Core/Cache/Type/DatabaseCache.php
+++ b/src/Core/Cache/Type/DatabaseCache.php
@@ -146,7 +146,7 @@ class DatabaseCache extends AbstractCache implements ICanCache
 	{
 		try {
 			if ($outdated) {
-				return $this->dba->delete('cache', ['`expires` < NOW()']);
+				return $this->dba->delete('cache', ['`expires` < ?', DateTimeFormat::utcNow()]);
 			} else {
 				return $this->dba->delete('cache', ['`k` IS NOT NULL ']);
 			}
diff --git a/src/Worker/ClearCache.php b/src/Worker/ClearCache.php
index 33bf589475..80dc5ec8c9 100644
--- a/src/Worker/ClearCache.php
+++ b/src/Worker/ClearCache.php
@@ -23,6 +23,7 @@ namespace Friendica\Worker;
 
 use Friendica\Database\DBA;
 use Friendica\DI;
+use Friendica\Util\DateTimeFormat;
 
 /**
  * Clear cache entries
@@ -31,15 +32,13 @@ class ClearCache
 {
 	public static function execute()
 	{
-		$a = DI::app();
-
 		// clear old cache
 		DI::cache()->clear();
 
 		// Delete the cached OEmbed entries that are older than three month
-		DBA::delete('oembed', ["`created` < NOW() - INTERVAL 3 MONTH"]);
+		DBA::delete('oembed', ["`created` < ?", DateTimeFormat::utc('now - 3 months')]);
 
 		// Delete the cached "parsed_url" entries that are expired
-		DBA::delete('parsed_url', ["`expires` < NOW()"]);
+		DBA::delete('parsed_url', ["`expires` < ?", DateTimeFormat::utcNow()]);
 	}
 }